Moved and renamed several classes

data/.gitignore

@@ -0,0 +1 @@
+/build

data/build.gradle

@@ -0,0 +1,21 @@
+plugins {
+    id "kotlin"
+}
+
+tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
+    sourceCompatibility = JavaVersion.VERSION_11
+    targetCompatibility = JavaVersion.VERSION_11
+
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_11.toString()
+    }
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.0"
+    implementation "org.json:json:20211205"
+
+    testImplementation "junit:junit:4.13.2"
+    testImplementation "org.mockito:mockito-core:4.3.1"
+    testImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-test:1.6.0"
+}

data/src/main/java/com/rtbishop/look4sat/data/DataParser.kt

@@ -0,0 +1,158 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.data
+
+import com.rtbishop.look4sat.domain.model.SatRadio
+import com.rtbishop.look4sat.domain.predict.OrbitalData
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.withContext
+import org.json.JSONArray
+import org.json.JSONObject
+import java.io.InputStream
+import kotlin.math.pow
+
+class DataParser(private val parserDispatcher: CoroutineDispatcher) {
+
+    suspend fun parseCSVStream(csvStream: InputStream): List<OrbitalData> = withContext(parserDispatcher) {
+        val parsedItems = mutableListOf<OrbitalData>()
+        csvStream.bufferedReader().useLines { lines ->
+            lines.forEachIndexed { index, line ->
+                if (index != 0) {
+                    val values = line.split(",")
+                    parseCSV(values)?.let { tle -> parsedItems.add(tle) }
+                }
+            }
+        }
+        return@withContext parsedItems
+    }
+
+    suspend fun parseTLEStream(tleStream: InputStream): List<OrbitalData> = withContext(parserDispatcher) {
+        val tleStrings = mutableListOf(String(), String(), String())
+        val parsedItems = mutableListOf<OrbitalData>()
+        var lineIndex = 0
+        tleStream.bufferedReader().forEachLine { line ->
+            tleStrings[lineIndex] = line
+            if (lineIndex < 2) {
+                lineIndex++
+            } else {
+                val isLineOneValid = tleStrings[1].substring(0, 1) == "1"
+                val isLineTwoValid = tleStrings[2].substring(0, 1) == "2"
+                if (!isLineOneValid && !isLineTwoValid) return@forEachLine
+                parseTLE(tleStrings)?.let { tle -> parsedItems.add(tle) }
+                lineIndex = 0
+            }
+        }
+        return@withContext parsedItems
+    }
+
+    suspend fun parseJSONStream(jsonStream: InputStream): List<SatRadio> {
+        return withContext(parserDispatcher) {
+            val parsedItems = mutableListOf<SatRadio>()
+            try {
+                val jsonArray = JSONArray(jsonStream.bufferedReader().readText())
+                for (index in 0 until jsonArray.length()) {
+                    val jsonObject = jsonArray.getJSONObject(index)
+                    parseJSON(jsonObject)?.let { parsedItems.add(it) }
+                }
+                return@withContext parsedItems
+            } catch (exception: Exception) {
+                return@withContext parsedItems
+            }
+        }
+    }
+
+    private fun parseCSV(values: List<String>): OrbitalData? {
+        try {
+            val name = values[0]
+            val year = values[2].substring(0, 4)
+            val month = values[2].substring(5, 7)
+            val dayOfMonth = values[2].substring(8, 10)
+            val dayInt = getDayOfYear(year.toInt(), month.toInt(), dayOfMonth.toInt())
+            val day = if (dayInt < 10) "00$dayInt" else if (dayInt < 100) "0$dayInt" else "$dayInt"
+            val hour = values[2].substring(11, 13).toInt() * 3600000 // ms in one hour
+            val min = values[2].substring(14, 16).toInt() * 60000 // ms in one minute
+            val sec = values[2].substring(17, 19).toInt() * 1000 // ms in one second
+            val ms = values[2].substring(20, 26).toInt() / 1000.0 // microseconds to ms
+            val frac = ((hour + min + sec + ms) / 86400000.0).toString()
+            val epoch = "${year.substring(2)}$day${frac.substring(1)}".toDouble()
+            val meanmo = values[3].toDouble()
+            val eccn = values[4].toDouble()
+            val incl = values[5].toDouble()
+            val raan = values[6].toDouble()
+            val argper = values[7].toDouble()
+            val meanan = values[8].toDouble()
+            val catnum = values[11].toInt()
+            val bstar = values[14].toDouble()
+            return OrbitalData(name, epoch, meanmo, eccn, incl, raan, argper, meanan, catnum, bstar)
+        } catch (exception: Exception) {
+            return null
+        }
+    }
+
+    private fun parseTLE(tle: List<String>): OrbitalData? {
+        if (tle[1].substring(0, 1) != "1" && tle[2].substring(0, 1) != "2") {
+            return null
+        }
+        try {
+            val name: String = tle[0].trim()
+            val epoch: Double = tle[1].substring(18, 32).toDouble()
+            val meanmo: Double = tle[2].substring(52, 63).toDouble()
+            val eccn: Double = tle[2].substring(26, 33).toDouble() / 10000000.0
+            val incl: Double = tle[2].substring(8, 16).toDouble()
+            val raan: Double = tle[2].substring(17, 25).toDouble()
+            val argper: Double = tle[2].substring(34, 42).toDouble()
+            val meanan: Double = tle[2].substring(43, 51).toDouble()
+            val catnum: Int = tle[1].substring(2, 7).trim().toInt()
+            val bstar: Double = 1.0e-5 * tle[1].substring(53, 59).toDouble() /
+                    10.0.pow(tle[1].substring(60, 61).toDouble())
+            return OrbitalData(name, epoch, meanmo, eccn, incl, raan, argper, meanan, catnum, bstar)
+        } catch (exception: Exception) {
+            return null
+        }
+    }
+
+    private fun parseJSON(json: JSONObject): SatRadio? {
+        try {
+            val uuid = json.getString("uuid")
+            val info = json.getString("description")
+            val isAlive = json.getBoolean("alive")
+            val downlink = if (json.isNull("downlink_low")) null
+            else json.getLong("downlink_low")
+            val uplink = if (json.isNull("uplink_low")) null
+            else json.getLong("uplink_low")
+            val mode = if (json.isNull("mode")) null
+            else json.getString("mode")
+            val isInverted = json.getBoolean("invert")
+            val catnum = if (json.isNull("norad_cat_id")) null
+            else json.getInt("norad_cat_id")
+            return SatRadio(uuid, info, isAlive, downlink, uplink, mode, isInverted, catnum)
+        } catch (exception: Exception) {
+            return null
+        }
+    }
+
+    private fun getDayOfYear(year: Int, month: Int, dayOfMonth: Int): Int {
+        if (month == 1) return dayOfMonth
+        val daysArray = arrayOf(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)
+        var dayOfYear = dayOfMonth
+        // If leap year increment Feb days
+        if (((year / 4 == 0) && (year / 100 != 0)) || (year / 400 == 0)) daysArray[1]++
+        for (i in 0 until month - 1) { dayOfYear += daysArray[i] }
+        return dayOfYear
+    }
+}

data/src/main/java/com/rtbishop/look4sat/data/IProvider.kt

@@ -0,0 +1,29 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.data
+
+import java.io.InputStream
+
+interface IProvider {
+
+    val radioApi: String get() = "https://db.satnogs.org/api/transmitters/?format=json"
+
+    suspend fun getLocalFileStream(uri: String): InputStream?
+
+    suspend fun getRemoteFileStream(url: String): InputStream?
+}

data/src/main/java/com/rtbishop/look4sat/data/IStorage.kt

@@ -0,0 +1,43 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.data
+
+import com.rtbishop.look4sat.domain.model.SatEntry
+import com.rtbishop.look4sat.domain.model.SatItem
+import com.rtbishop.look4sat.domain.model.SatRadio
+import com.rtbishop.look4sat.domain.predict.Satellite
+import kotlinx.coroutines.flow.Flow
+
+interface IStorage {
+
+    fun getEntriesTotal(): Flow<Int>
+
+    fun getRadiosTotal(): Flow<Int>
+
+    suspend fun getEntriesWithModes(): List<SatItem>
+
+    suspend fun getEntriesWithIds(ids: List<Int>): List<Satellite>
+
+    suspend fun getRadiosWithId(id: Int): List<SatRadio>
+
+    suspend fun insertEntries(entries: List<SatEntry>)
+
+    suspend fun insertRadios(radios: List<SatRadio>)
+
+    suspend fun clearAllData()
+}

data/src/main/java/com/rtbishop/look4sat/data/Repository.kt

@@ -0,0 +1,114 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.data
+
+import com.rtbishop.look4sat.domain.IRepository
+import com.rtbishop.look4sat.domain.model.DataState
+import com.rtbishop.look4sat.domain.model.SatEntry
+import kotlinx.coroutines.*
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import java.io.InputStream
+import java.util.zip.ZipInputStream
+
+class Repository(
+    private val dataParser: DataParser,
+    private val storage: IStorage,
+    private val provider: IProvider,
+    private val repoScope: CoroutineScope
+) : IRepository {
+
+    private val exceptionHandler = CoroutineExceptionHandler { _, exception ->
+        _updateState.value = DataState.Error(exception.message)
+    }
+    private val updateStateDelay = 875L
+    private val _updateState = MutableStateFlow<DataState<Long>>(DataState.Handled)
+    override val updateState: StateFlow<DataState<Long>> = _updateState
+
+    override fun getEntriesTotal() = storage.getEntriesTotal()
+
+    override fun getRadiosTotal() = storage.getRadiosTotal()
+
+    override suspend fun getEntriesWithModes() = storage.getEntriesWithModes()
+
+    override suspend fun getEntriesWithIds(ids: List<Int>) = storage.getEntriesWithIds(ids)
+
+    override suspend fun getRadiosWithId(id: Int) = storage.getRadiosWithId(id)
+
+    override fun updateFromFile(uri: String) {
+        repoScope.launch(exceptionHandler) {
+            _updateState.value = DataState.Loading
+            provider.getLocalFileStream(uri)?.let { fileStream ->
+                delay(updateStateDelay)
+                storage.insertEntries(importSatellites(fileStream))
+            }
+            _updateState.value = DataState.Success(0L)
+        }
+    }
+
+    override fun updateFromWeb(urls: List<String>) {
+        _updateState.value = DataState.Loading
+        repoScope.launch(exceptionHandler) {
+            val jobsMap = mutableMapOf<String, Deferred<InputStream?>>()
+            val streamsMap = mutableMapOf<String, InputStream?>()
+            val streams = mutableListOf<InputStream>()
+            val entries = mutableListOf<SatEntry>()
+            urls.forEach { jobsMap[it] = async { provider.getRemoteFileStream(it) } }
+            jobsMap.forEach { job -> streamsMap[job.key] = job.value.await() }
+            streamsMap.forEach { stream ->
+                stream.value?.let { inputStream ->
+                    when {
+                        stream.key.contains("=csv", true) -> {
+                            val tles = dataParser.parseCSVStream(inputStream)
+                            entries.addAll(tles.map { tle -> SatEntry(tle) })
+                        }
+                        stream.key.contains(".zip", true) -> {
+                            streams.add(ZipInputStream(inputStream).apply { nextEntry })
+                        }
+                        else -> streams.add(inputStream)
+                    }
+                }
+            }
+            streams.forEach { stream -> entries.addAll(importSatellites(stream)) }
+            storage.insertEntries(entries)
+        }
+        repoScope.launch(exceptionHandler) {
+            provider.getRemoteFileStream(provider.radioApi)?.let { stream ->
+                storage.insertRadios(dataParser.parseJSONStream(stream))
+                _updateState.value = DataState.Success(0L)
+            }
+        }
+    }
+
+    override fun setUpdateStateHandled() {
+        _updateState.value = DataState.Handled
+    }
+
+    override fun clearAllData() {
+        repoScope.launch {
+            _updateState.value = DataState.Loading
+            delay(updateStateDelay)
+            storage.clearAllData()
+            _updateState.value = DataState.Success(0L)
+        }
+    }
+
+    private suspend fun importSatellites(stream: InputStream): List<SatEntry> {
+        return dataParser.parseTLEStream(stream).map { tle -> SatEntry(tle) }
+    }
+}

data/src/main/java/com/rtbishop/look4sat/domain/DataReporter.kt

@@ -0,0 +1,67 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain
+
+import kotlinx.coroutines.*
+import java.net.InetSocketAddress
+import java.nio.ByteBuffer
+import java.nio.channels.SocketChannel
+
+class DataReporter(reporterDispatcher: CoroutineDispatcher) {
+
+    private val reporterScope = CoroutineScope(reporterDispatcher)
+    private var rotationSocketChannel: SocketChannel? = null
+    private var rotationReporting: Job? = null
+
+//    private var frequencySocketChannel: SocketChannel? = null
+//    private var frequencyReporting: Job? = null
+//
+//    fun reportFrequency(server: String, port: Int, frequency: Long) {
+//        frequencyReporting = reporterScope.launch {
+//            runCatching {
+//                if (frequencySocketChannel == null) {
+//                    frequencySocketChannel = SocketChannel.open(InetSocketAddress(server, port))
+//                } else {
+//                    val buffer = ByteBuffer.wrap("\\set_freq $frequency\n".toByteArray())
+//                    frequencySocketChannel?.write(buffer)
+//                }
+//            }.onFailure { error ->
+//                println(error.localizedMessage)
+//                frequencySocketChannel = null
+//                frequencyReporting?.cancelAndJoin()
+//            }
+//        }
+//    }
+
+    fun reportRotation(server: String, port: Int, azimuth: Double, elevation: Double) {
+        rotationReporting = reporterScope.launch {
+            runCatching {
+                if (rotationSocketChannel == null) {
+                    rotationSocketChannel = SocketChannel.open(InetSocketAddress(server, port))
+                } else {
+                    val buffer = ByteBuffer.wrap("\\set_pos $azimuth $elevation\n".toByteArray())
+                    rotationSocketChannel?.write(buffer)
+                }
+            }.onFailure { error ->
+                println(error.localizedMessage)
+                rotationSocketChannel = null
+                rotationReporting?.cancelAndJoin()
+            }
+        }
+    }
+}

data/src/main/java/com/rtbishop/look4sat/domain/Extensions.kt

@@ -0,0 +1,79 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain
+
+import java.net.InetSocketAddress
+import java.net.Socket
+import java.security.MessageDigest
+import java.util.concurrent.TimeUnit
+import java.util.regex.Pattern
+
+fun Long.toTimerString(): String {
+    val format = "%02d:%02d:%02d"
+    val hours = TimeUnit.MILLISECONDS.toHours(this)
+    val minutes = TimeUnit.MILLISECONDS.toMinutes(this) % 60
+    val seconds = TimeUnit.MILLISECONDS.toSeconds(this) % 60
+    return String.format(format, hours, minutes, seconds)
+}
+
+fun Double.round(decimals: Int): Double {
+    var multiplier = 1.0
+    repeat(decimals) { multiplier *= 10 }
+    return kotlin.math.round(this * multiplier) / multiplier
+}
+
+fun String.getHash(type: String = "SHA-256"): String {
+    val hexChars = "0123456789ABCDEF"
+    val bytes = MessageDigest.getInstance(type).digest(this.toByteArray())
+    val result = StringBuilder(bytes.size * 2)
+    bytes.forEach {
+        val i = it.toInt()
+        result.append(hexChars[i shr 4 and 0x0f])
+        result.append(hexChars[i and 0x0f])
+    }
+    return result.toString()
+}
+
+fun String.isValidEmail(): Boolean {
+    val expression = "^[\\w.-]+@([\\w\\-]+\\.)+[A-Z]{2,8}$"
+    val pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE)
+    return pattern.matcher(this).matches()
+}
+
+fun String.isValidIPv4(): Boolean {
+    val ip4 = "^(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\\.(?!\$)|\$)){4}\$"
+    return this.matches(ip4.toRegex())
+}
+
+fun String.isValidPort(): Boolean {
+    return this.isNotEmpty() && this.toInt() in 1024..65535
+}
+
+fun ping(hostname: String, port: Int): Int {
+    val start = System.currentTimeMillis()
+    val socket = Socket()
+    try {
+        socket.connect(InetSocketAddress(hostname, port), 5000)
+        socket.close()
+    } catch (exception: Exception) {
+        exception.printStackTrace()
+        println("Failed to ping: $hostname")
+        return Int.MAX_VALUE
+    }
+    return (System.currentTimeMillis() - start).toInt()
+}

data/src/main/java/com/rtbishop/look4sat/domain/ILocationHandler.kt

@@ -0,0 +1,41 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain
+
+import com.rtbishop.look4sat.domain.model.DataState
+import com.rtbishop.look4sat.domain.predict.GeoPos
+import kotlinx.coroutines.flow.SharedFlow
+
+interface ILocationHandler {
+
+    val stationPosition: SharedFlow<DataState<GeoPos>>
+
+    fun getStationLocator(): String
+
+    fun getStationPosition(): GeoPos
+
+    fun setStationPosition(latitude: Double, longitude: Double)
+
+    fun setPositionFromGps()
+
+    fun setPositionFromNet()
+
+    fun setPositionFromQth(locator: String)
+
+    fun setPositionHandled()
+}

data/src/main/java/com/rtbishop/look4sat/domain/IRepository.kt

@@ -0,0 +1,48 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain
+
+import com.rtbishop.look4sat.domain.model.DataState
+import com.rtbishop.look4sat.domain.model.SatItem
+import com.rtbishop.look4sat.domain.model.SatRadio
+import com.rtbishop.look4sat.domain.predict.Satellite
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.StateFlow
+
+interface IRepository {
+
+    val updateState: StateFlow<DataState<Long>>
+
+    fun getEntriesTotal(): Flow<Int>
+
+    fun getRadiosTotal(): Flow<Int>
+
+    suspend fun getEntriesWithModes(): List<SatItem>
+
+    suspend fun getEntriesWithIds(ids: List<Int>): List<Satellite>
+
+    suspend fun getRadiosWithId(id: Int): List<SatRadio>
+
+    fun updateFromFile(uri: String)
+
+    fun updateFromWeb(urls: List<String>)
+
+    fun setUpdateStateHandled()
+
+    fun clearAllData()
+}

data/src/main/java/com/rtbishop/look4sat/domain/ISettings.kt

@@ -0,0 +1,83 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain
+
+import com.rtbishop.look4sat.domain.predict.GeoPos
+
+interface ISettings {
+
+    val defaultSources: List<String>
+        get() = listOf(
+            "https://www.prismnet.com/~mmccants/tles/inttles.zip",
+            "https://www.prismnet.com/~mmccants/tles/classfd.zip",
+            "https://celestrak.com/NORAD/elements/gp.php?GROUP=active&FORMAT=csv",
+            "https://amsat.org/tle/current/nasabare.txt"
+        )
+
+    fun loadStationLocator(): String
+
+    fun saveStationLocator(locator: String)
+
+    fun loadStationPosition(): GeoPos
+
+    fun saveStationPosition(position: GeoPos)
+
+    fun getHoursAhead(): Int
+
+    fun setHoursAhead(hoursAhead: Int)
+
+    fun getMinElevation(): Double
+
+    fun setMinElevation(minElevation: Double)
+
+    fun getUseUTC(): Boolean
+
+    fun setUseUTC(value: Boolean)
+
+    fun getUseCompass(): Boolean
+
+    fun setUseCompass(value: Boolean)
+
+    fun getShowSweep(): Boolean
+
+    fun setShowSweep(value: Boolean)
+
+    fun saveModesSelection(modes: List<String>)
+
+    fun loadModesSelection(): List<String>
+
+    fun saveEntriesSelection(catnums: List<Int>)
+
+    fun loadEntriesSelection(): List<Int>
+
+    fun getRotatorEnabled(): Boolean
+
+    fun setRotatorEnabled(value: Boolean)
+
+    fun getRotatorServer(): String
+
+    fun setRotatorServer(value: String)
+
+    fun getRotatorPort(): String
+
+    fun setRotatorPort(value: String)
+
+    fun loadDataSources(): List<String>
+
+    fun saveDataSources(sources: List<String>)
+}

data/src/main/java/com/rtbishop/look4sat/domain/QthConverter.kt

@@ -0,0 +1,61 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain
+
+import com.rtbishop.look4sat.domain.predict.GeoPos
+
+object QthConverter {
+
+    fun qthToPosition(locator: String): GeoPos? {
+        val trimmedQth = locator.take(6)
+        if (!isValidLocator(trimmedQth)) return null
+        val lonFirst = (trimmedQth[0].uppercaseChar().code - 65) * 20
+        val latFirst = (trimmedQth[1].uppercaseChar().code - 65) * 10
+        val lonSecond = trimmedQth[2].toString().toInt() * 2
+        val latSecond = trimmedQth[3].toString().toInt()
+        val lonThird = (((trimmedQth[4].lowercaseChar().code - 97) / 12.0) + (1.0 / 24.0)) - 180
+        val latThird = (((trimmedQth[5].lowercaseChar().code - 97) / 24.0) + (1.0 / 48.0)) - 90
+        val longitude = (lonFirst + lonSecond + lonThird).round(4)
+        val latitude = (latFirst + latSecond + latThird).round(4)
+        return GeoPos(latitude, longitude)
+    }
+
+    fun positionToQth(lat: Double, lon: Double): String? {
+        if (!isValidPosition(lat, lon)) return null
+        val tempLon = if (lon > 180.0) lon - 180 else lon
+        val upper = "ABCDEFGHIJKLMNOPQRSTUVWX"
+        val lower = "abcdefghijklmnopqrstuvwx"
+        val longitude = tempLon + 180
+        val latitude = lat + 90
+        val lonFirst = upper[(longitude / 20).toInt()]
+        val latFirst = upper[(latitude / 10).toInt()]
+        val lonSecond = ((longitude / 2) % 10).toInt().toString()
+        val latSecond = (latitude % 10).toInt().toString()
+        val lonThird = lower[((longitude % 2) * 12).toInt()]
+        val latThird = lower[((latitude % 1) * 24).toInt()]
+        return "$lonFirst$latFirst$lonSecond$latSecond$lonThird$latThird"
+    }
+
+    fun isValidPosition(lat: Double, lon: Double): Boolean {
+        return (lat >= -90.0 && lat <= 90.0) && (lon >= -180.0 && lon <= 360.0)
+    }
+
+    fun isValidLocator(locator: String): Boolean {
+        return locator.matches("[a-xA-X][a-xA-X][0-9][0-9][a-xA-X][a-xA-X]".toRegex())
+    }
+}

data/src/main/java/com/rtbishop/look4sat/domain/model/DataState.kt

@@ -0,0 +1,25 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain.model
+
+sealed class DataState<out T> {
+    data class Success<out T>(val data: T) : DataState<T>()
+    data class Error(val message: String?) : DataState<Nothing>()
+    object Handled : DataState<Nothing>()
+    object Loading : DataState<Nothing>()
+}

data/src/main/java/com/rtbishop/look4sat/domain/model/SatEntry.kt

@@ -0,0 +1,22 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain.model
+
+import com.rtbishop.look4sat.domain.predict.OrbitalData
+
+data class SatEntry(val data: OrbitalData, var comment: String? = null)

data/src/main/java/com/rtbishop/look4sat/domain/model/SatItem.kt

@@ -0,0 +1,25 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain.model
+
+data class SatItem(
+    val catnum: Int,
+    val name: String,
+    val modes: List<String>,
+    var isSelected: Boolean
+)

data/src/main/java/com/rtbishop/look4sat/domain/model/SatRadio.kt

@@ -0,0 +1,30 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain.model
+
+data class SatRadio(
+    val uuid: String,
+    val info: String,
+    val isAlive: Boolean,
+    var downlink: Long?,
+    var uplink: Long?,
+    val mode: String?,
+    val isInverted: Boolean,
+    val catnum: Int?,
+    var comment: String? = null
+)

data/src/main/java/com/rtbishop/look4sat/domain/predict/DeepSpaceSat.kt

@@ -0,0 +1,849 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain.predict
+
+import kotlin.math.*
+
+class DeepSpaceSat(data: OrbitalData) : Satellite(data) {
+
+    private val c1: Double
+    private val c4: Double
+    private val x1mth2: Double
+    private val x3thm1: Double
+    private val xlcof: Double
+    private val xnodcf: Double
+    private val t2cof: Double
+    private val aycof: Double
+    private val x7thm1: Double
+    private val deep: DeepSpaceCalculator
+    private val dsv = DeepSpaceValueObject()
+
+    init {
+        // Recover original mean motion (xnodp) and semimajor axis (aodp) from input elements
+        val a1 = (xke / super.data.xno).pow(twoThirds)
+        dsv.cosio = cos(super.data.xincl)
+        dsv.theta2 = dsv.cosio * dsv.cosio
+        x3thm1 = 3.0 * dsv.theta2 - 1
+        dsv.eosq = super.data.eccn * super.data.eccn
+        dsv.betao2 = 1.0 - dsv.eosq
+        dsv.betao = sqrt(dsv.betao2)
+        val del1 = 1.5 * ck2 * x3thm1 / (a1 * a1 * dsv.betao * dsv.betao2)
+        val ao = a1 * (1.0 - del1 * (0.5 * twoThirds + del1 * (1.0 + 134.0 / 81.0 * del1)))
+        val delo = 1.5 * ck2 * x3thm1 / (ao * ao * dsv.betao * dsv.betao2)
+        dsv.xnodp = super.data.xno / (1.0 + delo)
+        dsv.aodp = ao / (1.0 - delo)
+        // For perigee below 156 km, the values of S and QOMS2T are altered
+        setPerigee((dsv.aodp * (1.0 - super.data.eccn) - 1.0) * earthRadius)
+        val pinvsq = invert(dsv.aodp * dsv.aodp * dsv.betao2 * dsv.betao2)
+        dsv.sing = sin(super.data.omegao)
+        dsv.cosg = cos(super.data.omegao)
+        val tsi = invert(dsv.aodp - s4)
+        val eta = dsv.aodp * super.data.eccn * tsi
+        val etasq = eta * eta
+        val eeta = super.data.eccn * eta
+        val psisq = abs(1.0 - etasq)
+        val coef = qoms24 * tsi.pow(4.0)
+        val coef1 = coef / psisq.pow(3.5)
+        val c2 = coef1 * dsv.xnodp * (dsv.aodp * (1.0 + 1.5 * etasq + eeta * (4.0 + etasq))
+                + 0.75 * ck2 * tsi / psisq * x3thm1 * (8.0 + 3.0 * etasq * (8.0 + etasq)))
+        c1 = super.data.bstar * c2
+        dsv.sinio = sin(super.data.xincl)
+        val a3ovk2 = -j3Harmonic / ck2
+        x1mth2 = 1.0 - dsv.theta2
+        c4 =
+            2 * dsv.xnodp * coef1 * dsv.aodp * dsv.betao2 * (eta * (2.0 + 0.5 * etasq) + super.data.eccn
+                    * (0.5 + 2 * etasq) - 2 * ck2 * tsi / (dsv.aodp * psisq)
+                    * (-3 * x3thm1 * (1.0 - 2 * eeta + etasq * (1.5 - 0.5 * eeta)) + (0.75 * x1mth2
+                    * (2.0 * etasq - eeta * (1.0 + etasq)) * cos(2.0 * super.data.omegao))))
+        val theta4 = dsv.theta2 * dsv.theta2
+        val temp1 = 3.0 * ck2 * pinvsq * dsv.xnodp
+        val temp2 = temp1 * ck2 * pinvsq
+        val temp3 = 1.25 * ck4 * pinvsq * pinvsq * dsv.xnodp
+        dsv.xmdot =
+            dsv.xnodp + 0.5 * temp1 * dsv.betao * x3thm1 + 0.0625 * temp2 * dsv.betao * (13 - 78 * dsv.theta2 + 137 * theta4)
+        val x1m5th = 1.0 - 5 * dsv.theta2
+        dsv.omgdot =
+            -0.5 * temp1 * x1m5th + 0.0625 * temp2 * (7.0 - 114 * dsv.theta2 + 395 * theta4) + temp3 * (3.0 - 36 * dsv.theta2 + 49 * theta4)
+        val xhdot1 = -temp1 * dsv.cosio
+        dsv.xnodot =
+            xhdot1 + (0.5 * temp2 * (4.0 - 19 * dsv.theta2) + 2 * temp3 * (3.0 - 7 * dsv.theta2)) * dsv.cosio
+        xnodcf = 3.5 * dsv.betao2 * xhdot1 * c1
+        t2cof = 1.5 * c1
+        xlcof = 0.125 * a3ovk2 * dsv.sinio * (3.0 + 5 * dsv.cosio) / (1.0 + dsv.cosio)
+        aycof = 0.25 * a3ovk2 * dsv.sinio
+        x7thm1 = 7.0 * dsv.theta2 - 1
+        deep = DeepSpaceCalculator(dsv)
+    }
+
+    internal fun calculateSDP4(tSince: Double) {
+        synchronized(this) {
+            val temp = DoubleArray(12)
+            val xmdf = data.xmo + dsv.xmdot * tSince
+            val tsq = tSince * tSince
+            val templ = t2cof * tsq
+            dsv.xll = xmdf + dsv.xnodp * templ
+            dsv.omgadf = data.omegao + dsv.omgdot * tSince
+            val xnoddf = data.xnodeo + dsv.xnodot * tSince
+            dsv.xnode = xnoddf + xnodcf * tsq
+            val tempa = 1.0 - c1 * tSince
+            val tempe = data.bstar * c4 * tSince
+            dsv.xn = dsv.xnodp
+            dsv.t = tSince
+            deep.dpsec(data)
+            val a = (xke / dsv.xn).pow(twoThirds) * tempa * tempa
+            dsv.em = dsv.em - tempe
+            deep.dpper()
+            val xl = dsv.xll + dsv.omgadf + dsv.xnode
+            val beta = sqrt(1.0 - dsv.em * dsv.em)
+            dsv.xn = xke / a.pow(1.5)
+
+            // Long period periodics
+            val axn = dsv.em * cos(dsv.omgadf)
+            temp[0] = invert(a * beta * beta)
+            val xll = temp[0] * xlcof * axn
+            val aynl = temp[0] * aycof
+            val xlt = xl + xll
+            val ayn = dsv.em * sin(dsv.omgadf) + aynl
+
+            // Solve Kepler's equation
+            val capu = mod2PI(xlt - dsv.xnode)
+            temp[2] = capu
+            converge(temp, axn, ayn, capu)
+            calculatePosAndVel(temp, a, axn, ayn)
+        }
+    }
+
+    private fun calculatePosAndVel(temp: DoubleArray, a: Double, axn: Double, ayn: Double) {
+        val ecose = temp[5] + temp[6]
+        val esine = temp[3] - temp[4]
+        val elsq = axn * axn + ayn * ayn
+        temp[0] = 1.0 - elsq
+        val pl = a * temp[0]
+        temp[9] = a * (1.0 - ecose)
+        temp[1] = invert(temp[9])
+        temp[10] = xke * sqrt(a) * esine * temp[1]
+        temp[11] = xke * sqrt(pl) * temp[1]
+        temp[2] = a * temp[1]
+        val betal = sqrt(temp[0])
+        temp[3] = invert(1.0 + betal)
+        val cosu = temp[2] * (temp[8] - axn + ayn * esine * temp[3])
+        val sinu = temp[2] * (temp[7] - ayn - axn * esine * temp[3])
+        val u = atan2(sinu, cosu)
+        val sin2u = 2.0 * sinu * cosu
+        val cos2u = 2.0 * cosu * cosu - 1
+        temp[0] = invert(pl)
+        temp[1] = ck2 * temp[0]
+        temp[2] = temp[1] * temp[0]
+
+        // Update for short periodics
+        val rk = temp[9] * (1.0 - 1.5 * temp[2] * betal * x3thm1) + 0.5 * temp[1] * x1mth2 * cos2u
+        val uk = u - 0.25 * temp[2] * x7thm1 * sin2u
+        val xnodek = dsv.xnode + 1.5 * temp[2] * dsv.cosio * sin2u
+        val xinck = dsv.xinc + 1.5 * temp[2] * dsv.cosio * dsv.sinio * cos2u
+        val rdotk = temp[10] - dsv.xn * temp[1] * x1mth2 * sin2u
+        val rfdotk = temp[11] + dsv.xn * temp[1] * (x1mth2 * cos2u + 1.5 * x3thm1)
+        super.calculatePosAndVel(rk, uk, xnodek, xinck, rdotk, rfdotk)
+    }
+
+    inner class DeepSpaceValueObject {
+        var eosq = 0.0
+        var sinio = 0.0
+        var cosio = 0.0
+        var betao = 0.0
+        var aodp = 0.0
+        var theta2 = 0.0
+        var sing = 0.0
+        var cosg = 0.0
+        var betao2 = 0.0
+        var xmdot = 0.0
+        var omgdot = 0.0
+        var xnodot = 0.0
+        var xnodp = 0.0
+
+        // Used by dpsec and dpper parts of Deep()
+        var xll = 0.0
+        var omgadf = 0.0
+        var xnode = 0.0
+        var em = 0.0
+        var xinc = 0.0
+        var xn = 0.0
+        var t = 0.0
+
+        // Used by thetg and Deep()
+        var ds50 = 0.0
+    }
+
+    inner class DeepSpaceCalculator(private val dsv: DeepSpaceValueObject) {
+
+        private val zSinis = 3.9785416E-1
+        private val zSings = -9.8088458E-1
+        private val zNs = 1.19459E-5
+        private val c1ss = 2.9864797E-6
+        private val zEs = 1.675E-2
+        private val zNl = 1.5835218E-4
+        private val c1l = 4.7968065E-7
+        private val zEl = 5.490E-2
+        private val root22 = 1.7891679E-6
+        private val root32 = 3.7393792E-7
+        private val root44 = 7.3636953E-9
+        private val root52 = 1.1428639E-7
+        private val root54 = 2.1765803E-9
+        private val tHdt = 4.3752691E-3
+        private val q22 = 1.7891679E-6
+        private val q31 = 2.1460748E-6
+        private val q33 = 2.2123015E-7
+        private val g22 = 5.7686396
+        private val g32 = 9.5240898E-1
+        private val g44 = 1.8014998
+        private val g52 = 1.0508330
+        private val g54 = 4.4108898
+
+        private val thgr: Double
+        private val xnq: Double
+        private val xqncl: Double
+        private val omegaq: Double
+        private var zmol = 0.0
+        private var zmos = 0.0
+
+        // Many fields below cannot be final because they are iteratively refined
+        private var savtsn = 0.0
+        private var ee2 = 0.0
+        private var e3 = 0.0
+        private var xi2 = 0.0
+        private var xl2 = 0.0
+        private var xl3 = 0.0
+        private var xl4 = 0.0
+        private var xgh2 = 0.0
+        private var xgh3 = 0.0
+        private var xgh4 = 0.0
+        private var xh2 = 0.0
+        private var xh3 = 0.0
+        private var sse = 0.0
+        private var ssi = 0.0
+        private var ssg = 0.0
+        private var xi3 = 0.0
+        private var se2 = 0.0
+        private var si2 = 0.0
+        private var sl2 = 0.0
+        private var sgh2 = 0.0
+        private var sh2 = 0.0
+        private var se3 = 0.0
+        private var si3 = 0.0
+        private var sl3 = 0.0
+        private var sgh3 = 0.0
+        private var sh3 = 0.0
+        private var sl4 = 0.0
+        private var sgh4 = 0.0
+        private var ssl = 0.0
+        private var ssh = 0.0
+        private var d3210 = 0.0
+        private var d3222 = 0.0
+        private var d4410 = 0.0
+        private var d4422 = 0.0
+        private var d5220 = 0.0
+        private var d5232 = 0.0
+        private var d5421 = 0.0
+        private var d5433 = 0.0
+        private var del1 = 0.0
+        private var del2 = 0.0
+        private var del3 = 0.0
+        private var fasx2 = 0.0
+        private var fasx4 = 0.0
+        private var fasx6 = 0.0
+        private var xlamo = 0.0
+        private val xfact: Double
+        private var xni: Double
+        private var atime: Double
+        private val stepp: Double
+        private val stepn: Double
+        private val step2: Double
+        private var preep = 0.0
+        private var pl = 0.0
+        private var sghs = 0.0
+        private var xli: Double
+        private var d2201 = 0.0
+        private var d2211 = 0.0
+        private var sghl = 0.0
+        private var sh1 = 0.0
+        private var pinc = 0.0
+        private var pe = 0.0
+        private var shs = 0.0
+        private var zsingl = 0.0
+        private var zcosgl = 0.0
+        private var zsinhl = 0.0
+        private var zcoshl = 0.0
+        private var zsinil = 0.0
+        private var zcosil = 0.0
+        private var a1 = 0.0
+        private var a2 = 0.0
+        private var a3 = 0.0
+        private var a4 = 0.0
+        private var a5 = 0.0
+        private var a6 = 0.0
+        private var a7 = 0.0
+        private var a8 = 0.0
+        private var a9 = 0.0
+        private var a10 = 0.0
+        private var ainv2 = 0.0
+        private var alfdp = 0.0
+        private val aqnv: Double
+        private var sgh = 0.0
+        private var sini2 = 0.0
+        private var sinis = 0.0
+        private var sinok = 0.0
+        private var sh = 0.0
+        private var si = 0.0
+        private var sil = 0.0
+        private val day: Double
+        private var betdp = 0.0
+        private var dalf = 0.0
+        private var bfact = 0.0
+        private var c = 0.0
+        private var cc = 0.0
+        private var cosis = 0.0
+        private var cosok = 0.0
+        private val cosq: Double
+        private var ctem = 0.0
+        private var f322 = 0.0
+        private var zx = 0.0
+        private var zy = 0.0
+        private var dbet = 0.0
+        private var dls = 0.0
+        private var eoc = 0.0
+        private val eq: Double
+        private var f2 = 0.0
+        private var f220 = 0.0
+        private var f221 = 0.0
+        private var f3 = 0.0
+        private var f311 = 0.0
+        private var f321 = 0.0
+        private var xnoh = 0.0
+        private var f330 = 0.0
+        private var f441 = 0.0
+        private var f442 = 0.0
+        private var f522 = 0.0
+        private var f523 = 0.0
+        private var f542 = 0.0
+        private var f543 = 0.0
+        private var g200 = 0.0
+        private var g201 = 0.0
+        private var g211 = 0.0
+        private var pgh = 0.0
+        private var ph = 0.0
+        private var s1 = 0.0
+        private var s2 = 0.0
+        private var s3 = 0.0
+        private var s4 = 0.0
+        private var s5 = 0.0
+        private var s6 = 0.0
+        private var s7 = 0.0
+        private var se = 0.0
+        private var sel = 0.0
+        private var ses = 0.0
+        private var xls = 0.0
+        private var g300 = 0.0
+        private var g310 = 0.0
+        private var g322 = 0.0
+        private var g410 = 0.0
+        private var g422 = 0.0
+        private var g520 = 0.0
+        private var g521 = 0.0
+        private var g532 = 0.0
+        private var g533 = 0.0
+        private var gam = 0.0
+        private val sinq: Double
+        private var sinzf = 0.0
+        private var sis = 0.0
+        private var sl = 0.0
+        private var sll = 0.0
+        private var sls = 0.0
+        private var stem = 0.0
+        private var temp = 0.0
+        private var temp1 = 0.0
+        private var x1 = 0.0
+        private var x2 = 0.0
+        private var x2li = 0.0
+        private var x2omi = 0.0
+        private var x3 = 0.0
+        private var x4 = 0.0
+        private var x5 = 0.0
+        private var x6 = 0.0
+        private var x7 = 0.0
+        private var x8 = 0.0
+        private var xl = 0.0
+        private var xldot = 0.0
+        private val xmao: Double
+        private var xnddt = 0.0
+        private var xndot = 0.0
+        private var xno2 = 0.0
+        private var xnodce = 0.0
+        private var xnoi = 0.0
+        private var xomi = 0.0
+        private val xpidot: Double
+        private var z1 = 0.0
+        private var z11 = 0.0
+        private var z12 = 0.0
+        private var z13 = 0.0
+        private var z2 = 0.0
+        private var z21 = 0.0
+        private var z22 = 0.0
+        private var z23 = 0.0
+        private var z3 = 0.0
+        private var z31 = 0.0
+        private var z32 = 0.0
+        private var z33 = 0.0
+        private var ze = 0.0
+        private var zf = 0.0
+        private var zm = 0.0
+        private var zn = 0.0
+        private var zsing = 0.0
+        private var zsinh = 0.0
+        private var zsini = 0.0
+        private var zcosg = 0.0
+        private var zcosh = 0.0
+        private var zcosi = 0.0
+        private var delt = 0.0
+        private var ft = 0.0
+        private var resonance: Boolean
+        private var synchronous: Boolean
+        private var doLoop = false
+        private var epochRestart = false
+
+        init {
+            thgr = thetaG(data.epoch)
+            eq = data.eccn
+            xnq = dsv.xnodp
+            aqnv = invert(dsv.aodp)
+            xqncl = data.xincl
+            xmao = data.xmo
+            xpidot = dsv.omgdot + dsv.xnodot
+            sinq = sin(data.xnodeo)
+            cosq = cos(data.xnodeo)
+            omegaq = data.omegao
+            // Initialize lunar solar terms, days since 1900 Jan 0.5
+            day = dsv.ds50 + 18261.5
+            if (abs(day - preep) > 1.0E-6) {
+                preep = day
+                xnodce = 4.5236020 - 9.2422029E-4 * day
+                stem = sin(xnodce)
+                ctem = cos(xnodce)
+                zcosil = 0.91375164 - 0.03568096 * ctem
+                zsinil = sqrt(1.0 - zcosil * zcosil)
+                zsinhl = 0.089683511 * stem / zsinil
+                zcoshl = sqrt(1.0 - zsinhl * zsinhl)
+                c = 4.7199672 + 0.22997150 * day
+                gam = 5.8351514 + 0.0019443680 * day
+                zmol = mod2PI(c - gam)
+                zx = 0.39785416 * stem / zsinil
+                zy = zcoshl * ctem + 0.91744867 * zsinhl * stem
+                zx = atan2(zx, zy)
+                zx = gam + zx - xnodce
+                zcosgl = cos(zx)
+                zsingl = sin(zx)
+                zmos = mod2PI(6.2565837 + 0.017201977 * day)
+            } else {
+                zmol = 0.0
+                zmos = 0.0
+            }
+            doSolarTerms()
+
+            // Geopotential resonance initialization for 12 hour orbits
+            resonance = false
+            synchronous = false
+            if (!(xnq < 0.0052359877 && xnq > 0.0034906585)) {
+                if (xnq < 0.00826 || xnq > 0.00924)
+                    if (eq < 0.5)
+                    // calculateResonance
+                        resonance = true
+                eoc = eq * dsv.eosq
+                g201 = -0.306 - (eq - 0.64) * 0.440
+                if (eq <= 0.65) {
+                    g211 = 3.616 - 13.247 * eq + 16.290 * dsv.eosq
+                    g310 = -19.302 + 117.390 * eq - 228.419 * dsv.eosq + 156.591 * eoc
+                    g322 = -18.9068 + 109.7927 * eq - 214.6334 * dsv.eosq + 146.5816 * eoc
+                    g410 = -41.122 + 242.694 * eq - 471.094 * dsv.eosq + 313.953 * eoc
+                    g422 = -146.407 + 841.880 * eq - 1629.014 * dsv.eosq + 1083.435 * eoc
+                    g520 = -532.114 + 3017.977 * eq - 5740 * dsv.eosq + 3708.276 * eoc
+                } else {
+                    g211 = -72.099 + 331.819 * eq - 508.738 * dsv.eosq + 266.724 * eoc
+                    g310 = -346.844 + 1582.851 * eq - 2415.925 * dsv.eosq + 1246.113 * eoc
+                    g322 = -342.585 + 1554.908 * eq - 2366.899 * dsv.eosq + 1215.972 * eoc
+                    g410 = -1052.797 + 4758.686 * eq - 7193.992 * dsv.eosq + 3651.957 * eoc
+                    g422 = -3581.69 + 16178.11 * eq - 24462.77 * dsv.eosq + 12422.52 * eoc
+                    g520 =
+                        if (eq <= 0.715) 1464.74 - 4664.75 * eq + 3763.64 * dsv.eosq
+                        else -5149.66 + 29936.92 * eq - 54087.36 * dsv.eosq + 31324.56 * eoc
+                }
+                if (eq < 0.7) {
+                    g533 = -919.2277 + 4988.61 * eq - 9064.77 * dsv.eosq + 5542.21 * eoc
+                    g521 = -822.71072 + 4568.6173 * eq - 8491.4146 * dsv.eosq + 5337.524 * eoc
+                    g532 = -853.666 + 4690.25 * eq - 8624.77 * dsv.eosq + 5341.4 * eoc
+                } else {
+                    g533 = -37995.78 + 161616.52 * eq - 229838.2 * dsv.eosq + 109377.94 * eoc
+                    g521 = -51752.104 + 218913.95 * eq - 309468.16 * dsv.eosq + 146349.42 * eoc
+                    g532 = -40023.88 + 170470.89 * eq - 242699.48 * dsv.eosq + 115605.82 * eoc
+                }
+                sini2 = dsv.sinio * dsv.sinio
+                f220 = 0.75 * (1.0 + 2 * dsv.cosio + dsv.theta2)
+                f221 = 1.5 * sini2
+                f321 = 1.875 * dsv.sinio * (1.0 - 2 * dsv.cosio - 3.0 * dsv.theta2)
+                f322 = -1.875 * dsv.sinio * (1.0 + 2 * dsv.cosio - 3.0 * dsv.theta2)
+                f441 = 35 * sini2 * f220
+                f442 = 39.3750 * sini2 * sini2
+                f522 =
+                    9.84375 * dsv.sinio * (sini2 * (1.0 - 2 * dsv.cosio - 5 * dsv.theta2) + 0.33333333 * (-2 + 4 * dsv.cosio + 6 * dsv.theta2))
+                f523 =
+                    dsv.sinio * (4.92187512 * sini2 * (-2 - 4 * dsv.cosio + 10 * dsv.theta2) + 6.56250012 * (1.0 + 2 * dsv.cosio - 3.0 * dsv.theta2))
+                f542 =
+                    29.53125 * dsv.sinio * (2.0 - 8 * dsv.cosio + dsv.theta2 * (-12 + 8 * dsv.cosio + 10 * dsv.theta2))
+                f543 =
+                    29.53125 * dsv.sinio * (-2 - 8 * dsv.cosio + dsv.theta2 * (12 + 8 * dsv.cosio - 10 * dsv.theta2))
+                xno2 = xnq * xnq
+                ainv2 = aqnv * aqnv
+                temp1 = 3.0 * xno2 * ainv2
+                temp = temp1 * root22
+                d2201 = temp * f220 * g201
+                d2211 = temp * f221 * g211
+                temp1 *= aqnv
+                temp = temp1 * root32
+                d3210 = temp * f321 * g310
+                d3222 = temp * f322 * g322
+                temp1 *= aqnv
+                temp = 2.0 * temp1 * root44
+                d4410 = temp * f441 * g410
+                d4422 = temp * f442 * g422
+                temp1 *= aqnv
+                temp = temp1 * root52
+                d5220 = temp * f522 * g520
+                d5232 = temp * f523 * g532
+                temp = 2.0 * temp1 * root54
+                d5421 = temp * f542 * g521
+                d5433 = temp * f543 * g533
+                xlamo = xmao + data.xnodeo + data.xnodeo - thgr - thgr
+                bfact = dsv.xmdot + dsv.xnodot + dsv.xnodot - tHdt - tHdt
+                bfact += ssl + ssh + ssh
+            } else {
+                // Init synchronous resonance terms
+                resonance = true
+                synchronous = true
+                g200 = 1.0 + dsv.eosq * (-2.5 + 0.8125 * dsv.eosq)
+                g310 = 1.0 + 2 * dsv.eosq
+                g300 = 1.0 + dsv.eosq * (-6 + 6.60937 * dsv.eosq)
+                f220 = 0.75 * (1.0 + dsv.cosio) * (1.0 + dsv.cosio)
+                f311 =
+                    0.9375 * dsv.sinio * dsv.sinio * (1.0 + 3.0 * dsv.cosio) - 0.75 * (1.0 + dsv.cosio)
+                f330 = 1.0 + dsv.cosio
+                f330 *= 1.875 * f330 * f330
+                del1 = 3.0 * xnq * xnq * aqnv * aqnv
+                del2 = 2.0 * del1 * f220 * g200 * q22
+                del3 = 3.0 * del1 * f330 * g300 * q33 * aqnv
+                del1 *= f311 * g310 * q31 * aqnv
+                fasx2 = 0.13130908
+                fasx4 = 2.8843198
+                fasx6 = 0.37448087
+                xlamo = xmao + data.xnodeo + data.omegao - thgr
+                bfact = dsv.xmdot + xpidot - tHdt
+                bfact += ssl + ssg + ssh
+            }
+            xfact = bfact - xnq
+            // Init integrator
+            xli = xlamo
+            xni = xnq
+            atime = 0.0
+            stepp = 720.0
+            stepn = -720.0
+            step2 = 259200.0
+        }
+
+        // Entrance for lunar-solar periodics
+        fun dpper() {
+            sinis = sin(dsv.xinc)
+            cosis = cos(dsv.xinc)
+            if (abs(savtsn - dsv.t) >= 30) {
+                savtsn = dsv.t
+                zm = zmos + zNs * dsv.t
+                zf = zm + 2 * zEs * sin(zm)
+                sinzf = sin(zf)
+                f2 = 0.5 * sinzf * sinzf - 0.25
+                f3 = -0.5 * sinzf * cos(zf)
+                ses = se2 * f2 + se3 * f3
+                sis = si2 * f2 + si3 * f3
+                sls = sl2 * f2 + sl3 * f3 + sl4 * sinzf
+                sghs = sgh2 * f2 + sgh3 * f3 + sgh4 * sinzf
+                shs = sh2 * f2 + sh3 * f3
+                zm = zmol + zNl * dsv.t
+                zf = zm + 2 * zEl * sin(zm)
+                sinzf = sin(zf)
+                f2 = 0.5 * sinzf * sinzf - 0.25
+                f3 = -0.5 * sinzf * cos(zf)
+                sel = ee2 * f2 + e3 * f3
+                sil = xi2 * f2 + xi3 * f3
+                sll = xl2 * f2 + xl3 * f3 + xl4 * sinzf
+                sghl = xgh2 * f2 + xgh3 * f3 + xgh4 * sinzf
+                sh1 = xh2 * f2 + xh3 * f3
+                pe = ses + sel
+                pinc = sis + sil
+                pl = sls + sll
+            }
+            pgh = sghs + sghl
+            ph = shs + sh1
+            dsv.xinc = dsv.xinc + pinc
+            dsv.em = dsv.em + pe
+            if (xqncl >= 0.2) {
+                /* Apply periodics directly */
+                ph /= dsv.sinio
+                pgh -= dsv.cosio * ph
+                dsv.omgadf = dsv.omgadf + pgh
+                dsv.xnode = dsv.xnode + ph
+                dsv.xll = dsv.xll + pl
+            } else {
+                applyPeriodics()
+                // This is a patch to Lyddane modification suggested by Rob Matson
+                if (abs(xnoh - dsv.xnode) > Math.PI) {
+                    if (dsv.xnode < xnoh) dsv.xnode += twoPi else dsv.xnode -= twoPi
+                }
+                dsv.xll = dsv.xll + pl
+                dsv.omgadf = xls - dsv.xll - cos(dsv.xinc) * dsv.xnode
+            }
+        }
+
+        // Entrance for deep space secular effects
+        fun dpsec(params: OrbitalData) {
+            dsv.xll = dsv.xll + ssl * dsv.t
+            dsv.omgadf = dsv.omgadf + ssg * dsv.t
+            dsv.xnode = dsv.xnode + ssh * dsv.t
+            dsv.em = params.eccn + sse * dsv.t
+            dsv.xinc = params.xincl + ssi * dsv.t
+            if (dsv.xinc < 0) {
+                dsv.xinc = -dsv.xinc
+                dsv.xnode = dsv.xnode + Math.PI
+                dsv.omgadf = dsv.omgadf - Math.PI
+            }
+            if (!resonance) return
+            do processEpochRestartLoop() while (doLoop && epochRestart)
+            dsv.xn = xni + xndot * ft + xnddt * ft * ft * 0.5
+            xl = xli + xldot * ft + xndot * ft * ft * 0.5
+            temp = -dsv.xnode + thgr + dsv.t * tHdt
+            if (synchronous) dsv.xll = xl - dsv.omgadf + temp else dsv.xll = xl + temp + temp
+        }
+
+        private fun doSolarTerms() {
+            savtsn = 1E20
+            zcosg = 1.945905E-1
+            zsing = zSings
+            zcosi = 9.1744867E-1
+            zsini = zSinis
+            zcosh = cosq
+            zsinh = sinq
+            cc = c1ss
+            zn = zNs
+            ze = zEs
+            xnoi = invert(xnq)
+            calculateSolarTerms()
+            calculateLunarTerms()
+            calculateSolarTerms() // Solar terms done again after Lunar terms are done
+            sse += se
+            ssi += si
+            ssl += sl
+            ssg = ssg + sgh - dsv.cosio / dsv.sinio * sh
+            ssh += sh / dsv.sinio
+        }
+
+        private fun calculateLunarTerms() {
+            sse = se
+            ssi = si
+            ssl = sl
+            ssh = sh / dsv.sinio
+            ssg = sgh - dsv.cosio * ssh
+            se2 = ee2
+            si2 = xi2
+            sl2 = xl2
+            sgh2 = xgh2
+            sh2 = xh2
+            se3 = e3
+            si3 = xi3
+            sl3 = xl3
+            sgh3 = xgh3
+            sh3 = xh3
+            sl4 = xl4
+            sgh4 = xgh4
+            zcosg = zcosgl
+            zsing = zsingl
+            zcosi = zcosil
+            zsini = zsinil
+            zcosh = zcoshl * cosq + zsinhl * sinq
+            zsinh = sinq * zcoshl - cosq * zsinhl
+            zn = zNl
+            cc = c1l
+            ze = zEl
+        }
+
+        private fun calculateSolarTerms() {
+            a1 = zcosg * zcosh + zsing * zcosi * zsinh
+            a3 = -zsing * zcosh + zcosg * zcosi * zsinh
+            a7 = -zcosg * zsinh + zsing * zcosi * zcosh
+            a8 = zsing * zsini
+            a9 = zsing * zsinh + zcosg * zcosi * zcosh
+            a10 = zcosg * zsini
+            a2 = dsv.cosio * a7 + dsv.sinio * a8
+            a4 = dsv.cosio * a9 + dsv.sinio * a10
+            a5 = -dsv.sinio * a7 + dsv.cosio * a8
+            a6 = -dsv.sinio * a9 + dsv.cosio * a10
+            x1 = a1 * dsv.cosg + a2 * dsv.sing
+            x2 = a3 * dsv.cosg + a4 * dsv.sing
+            x3 = -a1 * dsv.sing + a2 * dsv.cosg
+            x4 = -a3 * dsv.sing + a4 * dsv.cosg
+            x5 = a5 * dsv.sing
+            x6 = a6 * dsv.sing
+            x7 = a5 * dsv.cosg
+            x8 = a6 * dsv.cosg
+            z31 = 12 * x1 * x1 - 3.0 * x3 * x3
+            z32 = 24 * x1 * x2 - 6 * x3 * x4
+            z33 = 12 * x2 * x2 - 3.0 * x4 * x4
+            z1 = 3.0 * (a1 * a1 + a2 * a2) + z31 * dsv.eosq
+            z2 = 6.0 * (a1 * a3 + a2 * a4) + z32 * dsv.eosq
+            z3 = 3.0 * (a3 * a3 + a4 * a4) + z33 * dsv.eosq
+            z11 = -6 * a1 * a5 + dsv.eosq * (-24 * x1 * x7 - 6 * x3 * x5)
+            z12 =
+                -6 * (a1 * a6 + a3 * a5) + dsv.eosq * (-24 * (x2 * x7 + x1 * x8) - 6 * (x3 * x6 + x4 * x5))
+            z13 = -6 * a3 * a6 + dsv.eosq * (-24 * x2 * x8 - 6 * x4 * x6)
+            z21 = 6.0 * a2 * a5 + dsv.eosq * (24 * x1 * x5 - 6 * x3 * x7)
+            z22 =
+                6.0 * (a4 * a5 + a2 * a6) + dsv.eosq * (24 * (x2 * x5 + x1 * x6) - 6 * (x4 * x7 + x3 * x8))
+            z23 = 6.0 * a4 * a6 + dsv.eosq * (24 * x2 * x6 - 6 * x4 * x8)
+            z1 += z1 + dsv.betao2 * z31
+            z2 += z2 + dsv.betao2 * z32
+            z3 += z3 + dsv.betao2 * z33
+            s3 = cc * xnoi
+            s2 = -0.5 * s3 / dsv.betao
+            s4 = s3 * dsv.betao
+            s1 = -15 * eq * s4
+            s5 = x1 * x3 + x2 * x4
+            s6 = x2 * x3 + x1 * x4
+            s7 = x2 * x4 - x1 * x3
+            se = s1 * zn * s5
+            si = s2 * zn * (z11 + z13)
+            sl = -zn * s3 * (z1 + z3 - 14 - 6 * dsv.eosq)
+            sgh = s4 * zn * (z31 + z33 - 6)
+            sh = -zn * s2 * (z21 + z23)
+            if (xqncl < 5.2359877E-2) sh = 0.0
+            ee2 = 2.0 * s1 * s6
+            e3 = 2.0 * s1 * s7
+            xi2 = 2.0 * s2 * z12
+            xi3 = 2.0 * s2 * (z13 - z11)
+            xl2 = -2 * s3 * z2
+            xl3 = -2 * s3 * (z3 - z1)
+            xl4 = -2 * s3 * (-21 - 9 * dsv.eosq) * ze
+            xgh2 = 2.0 * s4 * z32
+            xgh3 = 2.0 * s4 * (z33 - z31)
+            xgh4 = -18 * s4 * ze
+            xh2 = -2 * s2 * z22
+            xh3 = -2 * s2 * (z23 - z21)
+        }
+
+        private fun processEpochRestartLoop() {
+            if (atime == 0.0 || dsv.t >= 0 && atime < 0 || dsv.t < 0 && atime >= 0) {
+                calculateDelta()
+                atime = 0.0
+                xni = xnq
+                xli = xlamo
+            } else if (abs(dsv.t) >= abs(atime)) calculateDelta()
+            processNotEpochRestartLoop()
+        }
+
+        private fun calculateDelta() {
+            delt = if (dsv.t < 0) stepn else stepp
+        }
+
+        private fun processNotEpochRestartLoop() {
+            do {
+                if (abs(dsv.t - atime) >= stepp) {
+                    doLoop = true
+                    epochRestart = false
+                } else {
+                    ft = dsv.t - atime
+                    doLoop = false
+                }
+                if (abs(dsv.t) < abs(atime)) {
+                    delt = if (dsv.t >= 0) stepn else stepp
+                    doLoop = doLoop or epochRestart
+                }
+                if (synchronous) {
+                    xndot = del1 * sin(xli - fasx2) + del2 * sin(2.0 * (xli - fasx4))
+                    +del3 * sin(3.0 * (xli - fasx6))
+                    xnddt = del1 * cos(xli - fasx2) + 2 * del2 * cos(2.0 * (xli - fasx4))
+                    +3.0 * del3 * cos(3.0 * (xli - fasx6))
+                } else {
+                    xomi = omegaq + dsv.omgdot * atime
+                    x2omi = xomi + xomi
+                    x2li = xli + xli
+                    xndot =
+                        d2201 * sin(x2omi + xli - g22) + d2211 * sin(xli - g22) + (d3210
+                                * sin(xomi + xli - g32)) + d3222 * sin(-xomi + xli - g32) + (d4410
+                                * sin(x2omi + x2li - g44)) + d4422 * sin(x2li - g44) + (d5220
+                                * sin(xomi + xli - g52)) + d5232 * sin(-xomi + xli - g52) + (d5421
+                                * sin(xomi + x2li - g54)) + d5433 * sin(-xomi + x2li - g54)
+                    xnddt =
+                        d2201 * cos(x2omi + xli - g22) + d2211 * cos(xli - g22) + (d3210
+                                * cos(xomi + xli - g32)) + d3222 * cos(-xomi + xli - g32) + (d5220
+                                * cos(xomi + xli - g52)) + d5232 * cos(-xomi + xli - g52) + (2
+                                * (d4410 * cos(x2omi + x2li - g44) + d4422 * cos(x2li - g44) + (d5421
+                                * cos(xomi + x2li - g54)) + d5433 * cos(-xomi + x2li - g54)))
+                }
+                xldot = xni + xfact
+                xnddt *= xldot
+                if (doLoop) {
+                    xli += xldot * delt + xndot * step2
+                    xni += xndot * delt + xnddt * step2
+                    atime += delt
+                }
+            } while (doLoop && !epochRestart)
+        }
+
+        // Apply periodics with Lyddane modification
+        private fun applyPeriodics() {
+            sinok = sin(dsv.xnode)
+            cosok = cos(dsv.xnode)
+            alfdp = sinis * sinok
+            betdp = sinis * cosok
+            dalf = ph * cosok + pinc * cosis * sinok
+            dbet = -ph * sinok + pinc * cosis * cosok
+            alfdp += dalf
+            betdp += dbet
+            dsv.xnode = mod2PI(dsv.xnode)
+            xls = dsv.xll + dsv.omgadf + cosis * dsv.xnode
+            dls = pl + pgh - pinc * dsv.xnode * sinis
+            xls += dls
+            xnoh = dsv.xnode
+            dsv.xnode = atan2(alfdp, betdp)
+        }
+
+        // Calculates the Greenwich Mean Sidereal Time for an epoch, valid 1957 through 2056
+        private fun thetaG(epoch: Double): Double {
+            var year = floor(epoch * 1E-3)
+            var dayOfYear = (epoch * 1E-3 - year) * 1000.0
+            year = if (year < 57) year + 2000 else year + 1900
+            val dayFloor = floor(dayOfYear)
+            val dayFraction = dayOfYear - dayFloor
+            dayOfYear = dayFloor
+            val jd = julianDateOfYear(year) + dayOfYear
+            dsv.ds50 = jd - 2433281.5 + dayFraction
+            return mod2PI(6.3003880987 * dsv.ds50 + 1.72944494)
+        }
+    }
+}

data/src/main/java/com/rtbishop/look4sat/domain/predict/GeoPos.kt

@@ -0,0 +1,20 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain.predict
+
+data class GeoPos(val latitude: Double, val longitude: Double, val name: String? = null)

data/src/main/java/com/rtbishop/look4sat/domain/predict/NearEarthSat.kt

@@ -0,0 +1,221 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain.predict
+
+import kotlin.math.*
+
+class NearEarthSat(data: OrbitalData) : Satellite(data) {
+
+    private val aodp: Double
+    private val aycof: Double
+    private val c1: Double
+    private val c4: Double
+    private val c5: Double
+    private val cosio: Double
+    private var d2 = 0.0
+    private var d3 = 0.0
+    private var d4 = 0.0
+    private val delmo: Double
+    private val omgcof: Double
+    private val eta: Double
+    private val omgdot: Double
+    private val sinio: Double
+    private val xnodp: Double
+    private val sinmo: Double
+    private val t2cof: Double
+    private var t3cof = 0.0
+    private var t4cof = 0.0
+    private var t5cof = 0.0
+    private val x1mth2: Double
+    private val x3thm1: Double
+    private val x7thm1: Double
+    private val xmcof: Double
+    private val xmdot: Double
+    private val xnodcf: Double
+    private val xnodot: Double
+    private val xlcof: Double
+    private val sgp4Simple: Boolean
+
+    init {
+        // Recover original mean motion (xnodp) and semimajor axis (aodp) from input elements
+        val a1 = (xke / super.data.xno).pow(twoThirds)
+        cosio = cos(super.data.xincl)
+        val theta2 = sqr(cosio)
+        x3thm1 = 3.0 * theta2 - 1.0
+        val eo = super.data.eccn
+        val eosq = sqr(eo)
+        val betao2 = 1.0 - eosq
+        val betao = sqrt(betao2)
+        val del1 = 1.5 * ck2 * x3thm1 / (sqr(a1) * betao * betao2)
+        val ao = a1 * (1.0 - del1 * (0.5 * twoThirds + del1 * (1.0 + 134.0 / 81.0 * del1)))
+        val delo = 1.5 * ck2 * x3thm1 / (sqr(ao) * betao * betao2)
+        xnodp = super.data.xno / (1.0 + delo)
+        aodp = ao / (1.0 - delo)
+
+        // For perigee less than 220 kilometers, the "simple" flag is set
+        sgp4Simple = aodp * (1.0 - eo) < 220 / earthRadius + 1.0
+
+        // For perigees below 156 km, the values of S and QOMS2T are altered
+        setPerigee((aodp * (1.0 - eo) - 1.0) * earthRadius)
+        val pinvsq = invert(sqr(aodp) * sqr(betao2))
+        val tsi = invert(aodp - s4)
+        eta = aodp * eo * tsi
+        val etasq = eta * eta
+        val eeta = eo * eta
+        val psisq = abs(1.0 - etasq)
+        val coef = qoms24 * tsi.pow(4.0)
+        val coef1 = coef / psisq.pow(3.5)
+        val bstar = super.data.bstar
+        val c2 = coef1 * xnodp * (aodp * (1.0 + 1.5 * etasq + eeta * (4.0 + etasq)) + 0.75
+                * ck2 * tsi / psisq * x3thm1 * (8.0 + 3.0 * etasq * (8.0 + etasq)))
+        c1 = bstar * c2
+        sinio = sin(super.data.xincl)
+        val a3ovk2 = -j3Harmonic / ck2
+        val c3 = coef * tsi * a3ovk2 * xnodp * sinio / eo
+        x1mth2 = 1.0 - theta2
+        val omegao = super.data.omegao
+        c4 = 2 * xnodp * coef1 * aodp * betao2 * (eta * (2.0 + 0.5 * etasq) + eo * (0.5 + 2 * etasq)
+                - 2 * ck2 * tsi / (aodp * psisq) * (-3 * x3thm1 * (1.0 - 2 * eeta + etasq
+                * (1.5 - 0.5 * eeta)) + 0.75 * x1mth2 * (2.0 * etasq - eeta * (1.0 + etasq))
+                * cos(2.0 * omegao)))
+        c5 = 2.0 * coef1 * aodp * betao2 * (1.0 + 2.75 * (etasq + eeta) + eeta * etasq)
+        val theta4 = sqr(theta2)
+        val temp1 = 3.0 * ck2 * pinvsq * xnodp
+        val temp2 = temp1 * ck2 * pinvsq
+        val temp3 = 1.25 * ck4 * pinvsq * pinvsq * xnodp
+        xmdot =
+            xnodp + 0.5 * temp1 * betao * x3thm1 + (0.0625 * temp2 * betao * (13.0 - 78.0 * theta2 + 137.0 * theta4))
+        val x1m5th = 1.0 - 5.0 * theta2
+        omgdot =
+            -0.5 * temp1 * x1m5th + 0.0625 * temp2 * (7.0 - 114.0 * theta2 + 395.0 * theta4) + temp3 * (3.0 - 36.0 * theta2 + 49.0 * theta4)
+        val xhdot1 = -temp1 * cosio
+        xnodot =
+            xhdot1 + (0.5 * temp2 * (4.0 - 19.0 * theta2) + 2.0 * temp3 * (3.0 - 7.0 * theta2)) * cosio
+        omgcof = bstar * c3 * cos(omegao)
+        xmcof = -twoThirds * coef * bstar / eeta
+        xnodcf = 3.5 * betao2 * xhdot1 * c1
+        t2cof = 1.5 * c1
+        xlcof = 0.125 * a3ovk2 * sinio * (3.0 + 5 * cosio) / (1.0 + cosio)
+        aycof = 0.25 * a3ovk2 * sinio
+        val xmo = super.data.xmo
+        delmo = (1.0 + eta * cos(xmo)).pow(3.0)
+        sinmo = sin(xmo)
+        x7thm1 = 7.0 * theta2 - 1
+        if (!sgp4Simple) {
+            val c1sq = sqr(c1)
+            d2 = 4.0 * aodp * tsi * c1sq
+            val temp = d2 * tsi * c1 / 3.0
+            d3 = (17 * aodp + s4) * temp
+            d4 = 0.5 * temp * aodp * tsi * (221 * aodp + 31 * s4) * c1
+            t3cof = d2 + 2 * c1sq
+            t4cof = 0.25 * (3.0 * d3 + c1 * (12 * d2 + 10 * c1sq))
+            t5cof = 0.2 * (3.0 * d4 + 12 * c1 * d3 + 6 * d2 * d2 + 15 * c1sq * (2.0 * d2 + c1sq))
+        } else {
+            d2 = 0.0
+            d3 = 0.0
+            d4 = 0.0
+            t3cof = 0.0
+            t4cof = 0.0
+            t5cof = 0.0
+        }
+    }
+
+    internal fun calculateSGP4(tSince: Double) {
+        synchronized(this) {
+            val temp = DoubleArray(9)
+            val xmdf = data.xmo + xmdot * tSince
+            val omgadf = data.omegao + omgdot * tSince
+            val xnoddf = data.xnodeo + xnodot * tSince
+            var omega = omgadf
+            var xmp = xmdf
+            val tsq = sqr(tSince)
+            val xnode = xnoddf + xnodcf * tsq
+            val bstar = data.bstar
+            var tempa = 1.0 - c1 * tSince
+            var tempe = bstar * c4 * tSince
+            var templ = t2cof * tsq
+            if (!sgp4Simple) {
+                val delomg = omgcof * tSince
+                val delm = xmcof * ((1.0 + eta * cos(xmdf)).pow(3.0) - delmo)
+                temp[0] = delomg + delm
+                xmp = xmdf + temp[0]
+                omega = omgadf - temp[0]
+                val tcube = tsq * tSince
+                val tfour = tSince * tcube
+                tempa = tempa - d2 * tsq - d3 * tcube - d4 * tfour
+                tempe += bstar * c5 * (sin(xmp) - sinmo)
+                templ += t3cof * tcube + tfour * (t4cof + tSince * t5cof)
+            }
+            val a = aodp * tempa.pow(2.0)
+            val eo = data.eccn
+            val e = eo - tempe
+            val xl = xmp + omega + xnode + xnodp * templ
+            val beta = sqrt(1.0 - e * e)
+            val xn = xke / a.pow(1.5)
+
+            // Long period periodics
+            val axn = e * cos(omega)
+            temp[0] = invert(a * sqr(beta))
+            val xll = temp[0] * xlcof * axn
+            val aynl = temp[0] * aycof
+            val xlt = xl + xll
+            val ayn = e * sin(omega) + aynl
+
+            // Solve Kepler's equation
+            val capu = mod2PI(xlt - xnode)
+            temp[2] = capu
+            converge(temp, axn, ayn, capu)
+            calculatePosAndVel(temp, xnode, a, xn, axn, ayn)
+        }
+    }
+
+    private fun calculatePosAndVel(
+        temp: DoubleArray, xnode: Double, a: Double,
+        xn: Double, axn: Double, ayn: Double
+    ) {
+        val ecose = temp[5] + temp[6]
+        val esine = temp[3] - temp[4]
+        val elsq = sqr(axn) + sqr(ayn)
+        temp[0] = 1.0 - elsq
+        val pl = a * temp[0]
+        val r = a * (1.0 - ecose)
+        temp[1] = invert(r)
+        val rdot = xke * sqrt(a) * esine * temp[1]
+        val rfdot = xke * sqrt(pl) * temp[1]
+        temp[2] = a * temp[1]
+        val betal = sqrt(temp[0])
+        temp[3] = invert(1.0 + betal)
+        val cosu = temp[2] * (temp[8] - axn + ayn * esine * temp[3])
+        val sinu = temp[2] * (temp[7] - ayn - axn * esine * temp[3])
+        val u = atan2(sinu, cosu)
+        val sin2u = 2.0 * sinu * cosu
+        val cos2u = 2.0 * cosu * cosu - 1
+        temp[0] = invert(pl)
+        temp[1] = ck2 * temp[0]
+        temp[2] = temp[1] * temp[0]
+
+        // Update for short periodics
+        val rk = r * (1.0 - 1.5 * temp[2] * betal * x3thm1) + 0.5 * temp[1] * x1mth2 * cos2u
+        val uk = u - 0.25 * temp[2] * x7thm1 * sin2u
+        val xnodek = xnode + 1.5 * temp[2] * cosio * sin2u
+        val xinck = data.xincl + 1.5 * temp[2] * cosio * sinio * cos2u
+        val rdotk = rdot - xn * temp[1] * x1mth2 * sin2u
+        val rfdotk = rfdot + xn * temp[1] * (x1mth2 * cos2u + 1.5 * x3thm1)
+        super.calculatePosAndVel(rk, uk, xnodek, xinck, rdotk, rfdotk)
+    }
+}

data/src/main/java/com/rtbishop/look4sat/domain/predict/OrbitalData.kt

@@ -0,0 +1,45 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain.predict
+
+data class OrbitalData(
+    val name: String,
+    val epoch: Double,
+    val meanmo: Double,
+    val eccn: Double,
+    val incl: Double,
+    val raan: Double,
+    val argper: Double,
+    val meanan: Double,
+    val catnum: Int,
+    val bstar: Double,
+    val xincl: Double = Math.toRadians(incl),
+    val xnodeo: Double = Math.toRadians(raan),
+    val omegao: Double = Math.toRadians(argper),
+    val xmo: Double = Math.toRadians(meanan),
+    val xno: Double = meanmo * Math.PI * 2.0 / 1440,
+    val isDeepspace: Boolean = meanmo < 6.4
+) {
+
+    fun createSat(): Satellite {
+        return when {
+            this.isDeepspace -> DeepSpaceSat(this)
+            else -> NearEarthSat(this)
+        }
+    }
+}

data/src/main/java/com/rtbishop/look4sat/domain/predict/Predictor.kt

@@ -0,0 +1,223 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain.predict
+
+import com.rtbishop.look4sat.domain.model.SatRadio
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.withContext
+
+class Predictor(private val predictorDispatcher: CoroutineDispatcher) {
+
+    private val _calculatedPasses = MutableSharedFlow<List<SatPass>>(replay = 1)
+    val calculatedPasses: SharedFlow<List<SatPass>> = _calculatedPasses
+
+    suspend fun getSatPos(sat: Satellite, pos: GeoPos, time: Long): SatPos {
+        return withContext(predictorDispatcher) { sat.getPosition(pos, time) }
+    }
+
+    suspend fun getSatTrack(sat: Satellite, pos: GeoPos, start: Long, end: Long): List<SatPos> {
+        return withContext(predictorDispatcher) {
+            val positions = mutableListOf<SatPos>()
+            var currentTime = start
+            while (currentTime < end) {
+                positions.add(sat.getPosition(pos, currentTime))
+                currentTime += 15000
+            }
+            positions
+        }
+    }
+
+    suspend fun processRadios(sat: Satellite, pos: GeoPos, radios: List<SatRadio>, time: Long): List<SatRadio> {
+        return withContext(predictorDispatcher) {
+            val satPos = sat.getPosition(pos, time)
+            val copiedList = radios.map { it.copy() }
+            copiedList.forEach { transmitter ->
+                transmitter.downlink?.let {
+                    transmitter.downlink = satPos.getDownlinkFreq(it)
+                }
+                transmitter.uplink?.let {
+                    transmitter.uplink = satPos.getUplinkFreq(it)
+                }
+            }
+            copiedList.map { it.copy() }
+        }
+    }
+
+    suspend fun processPasses(passList: List<SatPass>, time: Long): List<SatPass> {
+        return withContext(predictorDispatcher) {
+            passList.forEach { pass ->
+                if (!pass.isDeepSpace) {
+                    val timeStart = pass.aosTime
+                    if (time > timeStart) {
+                        val deltaNow = time.minus(timeStart).toFloat()
+                        val deltaTotal = pass.losTime.minus(timeStart).toFloat()
+                        pass.progress = ((deltaNow / deltaTotal) * 100).toInt()
+                    }
+                }
+            }
+            passList.filter { pass -> pass.progress < 100 }.map { it.copy() }
+        }
+    }
+
+    suspend fun forceCalculation(
+        satList: List<Satellite>,
+        pos: GeoPos,
+        time: Long,
+        hoursAhead: Int = 8,
+        minElevation: Double = 16.0
+    ) {
+        if (satList.isEmpty()) {
+            _calculatedPasses.emit(emptyList())
+        } else {
+            withContext(predictorDispatcher) {
+                val allPasses = mutableListOf<SatPass>()
+                satList.forEach { satellite ->
+                    allPasses.addAll(satellite.getPasses(pos, time, hoursAhead))
+                }
+                _calculatedPasses.emit(allPasses.filter(time, hoursAhead, minElevation))
+            }
+        }
+    }
+
+    private fun Satellite.getPasses(pos: GeoPos, time: Long, hours: Int): List<SatPass> {
+        val passes = mutableListOf<SatPass>()
+        val endDate = time + hours * 60L * 60L * 1000L
+        val quarterOrbitMin = (this.orbitalPeriod / 4.0).toInt()
+        var startDate = time
+        var shouldRewind = true
+        var lastAosDate: Long
+        var count = 0
+        if (this.willBeSeen(pos)) {
+            if (this.data.isDeepspace) {
+                passes.add(getGeoPass(this, pos, time))
+            } else {
+                do {
+                    if (count > 0) shouldRewind = false
+                    val pass = getLeoPass(this, pos, startDate, shouldRewind)
+                    lastAosDate = pass.aosTime
+                    passes.add(pass)
+                    startDate = pass.losTime + (quarterOrbitMin * 3) * 60L * 1000L
+                    count++
+                } while (lastAosDate < endDate)
+            }
+        }
+        return passes
+    }
+
+    private fun List<SatPass>.filter(time: Long, hoursAhead: Int, minElev: Double): List<SatPass> {
+        val timeFuture = time + (hoursAhead * 60L * 60L * 1000L)
+        return this.filter { it.losTime > time }
+            .filter { it.aosTime < timeFuture }
+            .filter { it.maxElevation > minElev }
+            .sortedBy { it.aosTime }
+    }
+
+    private fun getGeoPass(sat: Satellite, pos: GeoPos, time: Long): SatPass {
+        val satPos = sat.getPosition(pos, time)
+        val aos = time - 24 * 60L * 60L * 1000L
+        val los = time + 24 * 60L * 60L * 1000L
+        val tca = (aos + los) / 2
+        val az = Math.toDegrees(satPos.azimuth)
+        val elev = Math.toDegrees(satPos.elevation)
+        val alt = satPos.altitude
+        return SatPass(aos, az, los, az, tca, az, alt, elev, sat)
+    }
+
+    private fun getLeoPass(sat: Satellite, pos: GeoPos, time: Long, rewind: Boolean): SatPass {
+        val quarterOrbitMin = (sat.orbitalPeriod / 4.0).toInt()
+        var calendarTimeMillis = time
+        var elevation: Double
+        var maxElevation = 0.0
+        var alt = 0.0
+        var tcaAz = 0.0
+        // rewind 1/4 of an orbit
+        if (rewind) calendarTimeMillis += -quarterOrbitMin * 60L * 1000L
+
+        var satPos = sat.getPosition(pos, calendarTimeMillis)
+        if (satPos.elevation > 0.0) {
+            // move forward in 30 second intervals until the sat goes below the horizon
+            do {
+                calendarTimeMillis += 30 * 1000L
+                satPos = sat.getPosition(pos, calendarTimeMillis)
+            } while (satPos.elevation > 0.0)
+            // move forward 3/4 of an orbit
+            calendarTimeMillis += quarterOrbitMin * 3 * 60L * 1000L
+        }
+
+        // find the next time sat comes above the horizon
+        do {
+            calendarTimeMillis += 60L * 1000L
+            satPos = sat.getPosition(pos, calendarTimeMillis)
+            elevation = satPos.elevation
+            if (elevation > maxElevation) {
+                maxElevation = elevation
+                alt = satPos.altitude
+                tcaAz = Math.toDegrees(satPos.azimuth)
+            }
+        } while (satPos.elevation < 0.0)
+
+        // refine to 3 seconds
+        calendarTimeMillis += -60L * 1000L
+        do {
+            calendarTimeMillis += 3L * 1000L
+            satPos = sat.getPosition(pos, calendarTimeMillis)
+            elevation = satPos.elevation
+            if (elevation > maxElevation) {
+                maxElevation = elevation
+                alt = satPos.altitude
+                tcaAz = Math.toDegrees(satPos.azimuth)
+            }
+        } while (satPos.elevation < 0.0)
+
+        val aos = satPos.time
+        val aosAz = Math.toDegrees(satPos.azimuth)
+
+        // find when sat goes below
+        do {
+            calendarTimeMillis += 30L * 1000L
+            satPos = sat.getPosition(pos, calendarTimeMillis)
+            elevation = satPos.elevation
+            if (elevation > maxElevation) {
+                maxElevation = elevation
+                alt = satPos.altitude
+                tcaAz = Math.toDegrees(satPos.azimuth)
+            }
+        } while (satPos.elevation > 0.0)
+
+        // refine to 3 seconds
+        calendarTimeMillis += -30L * 1000L
+        do {
+            calendarTimeMillis += 3L * 1000L
+            satPos = sat.getPosition(pos, calendarTimeMillis)
+            elevation = satPos.elevation
+            if (elevation > maxElevation) {
+                maxElevation = elevation
+                alt = satPos.altitude
+                tcaAz = Math.toDegrees(satPos.azimuth)
+            }
+        } while (satPos.elevation > 0.0)
+
+        val los = satPos.time
+        val losAz = Math.toDegrees(satPos.azimuth)
+        val tca = (aos + los) / 2
+        val elev = Math.toDegrees(maxElevation)
+        return SatPass(aos, aosAz, los, losAz, tca, tcaAz, alt, elev, sat)
+    }
+}

data/src/main/java/com/rtbishop/look4sat/domain/predict/SatPass.kt

@@ -0,0 +1,35 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain.predict
+
+data class SatPass(
+    val aosTime: Long,
+    val aosAzimuth: Double,
+    val losTime: Long,
+    val losAzimuth: Double,
+    val tcaTime: Long,
+    val tcaAzimuth: Double,
+    val altitude: Double,
+    val maxElevation: Double,
+    val satellite: Satellite,
+    var progress: Int = 0
+) {
+    val catNum: Int = satellite.data.catnum
+    val name: String = satellite.data.name
+    val isDeepSpace: Boolean = satellite.data.isDeepspace
+}

data/src/main/java/com/rtbishop/look4sat/domain/predict/SatPos.kt

@@ -0,0 +1,86 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain.predict
+
+import kotlin.math.*
+
+data class SatPos(
+    var azimuth: Double = 0.0,
+    var elevation: Double = 0.0,
+    var latitude: Double = 0.0,
+    var longitude: Double = 0.0,
+    var altitude: Double = 0.0,
+    var distance: Double = 0.0,
+    var distanceRate: Double = 0.0,
+    var theta: Double = 0.0,
+    var time: Long = 0L
+) {
+    private val earthRadiusKm = 6378.16
+    private val speedOfLight = 2.99792458E8
+
+    fun getDownlinkFreq(freq: Long): Long {
+        return (freq.toDouble() * (speedOfLight - distanceRate * 1000.0) / speedOfLight).toLong()
+    }
+
+    fun getUplinkFreq(freq: Long): Long {
+        return (freq.toDouble() * (speedOfLight + distanceRate * 1000.0) / speedOfLight).toLong()
+    }
+
+    fun getOrbitalVelocity(): Double {
+        val earthG = 6.674 * 10.0.pow(-11)
+        val earthM = 5.98 * 10.0.pow(24)
+        val radius = 6.37 * 10.0.pow(6) + altitude * 10.0.pow(3)
+        return sqrt(earthG * earthM / radius) / 1000
+    }
+
+    fun getRangeCircle(): List<GeoPos> {
+        val positions = mutableListOf<GeoPos>()
+        val beta = acos(earthRadiusKm / (earthRadiusKm + altitude))
+        var tempAzimuth = 0
+        while (tempAzimuth < 360) {
+            val azimuth = tempAzimuth / 360.0 * 2.0 * Math.PI
+            var lat = asin(sin(latitude) * cos(beta) + cos(azimuth) * sin(beta) * cos(latitude))
+            val num = (cos(beta) - (sin(latitude) * sin(lat)))
+            val den = cos(latitude) * cos(lat)
+            var lon = if (tempAzimuth == 0 && (beta > ((Math.PI / 2.0) - latitude))) {
+                longitude + Math.PI
+            } else if (tempAzimuth == 180 && (beta > ((Math.PI / 2.0) - latitude))) {
+                longitude + Math.PI
+            } else if (abs(num / den) > 1.0) {
+                longitude
+            } else {
+                if ((180 - tempAzimuth) >= 0) {
+                    longitude - acos(num / den)
+                } else {
+                    longitude + acos(num / den)
+                }
+            }
+            while (lon < 0.0) lon += Math.PI * 2.0
+            while (lon > Math.PI * 2.0) lon -= Math.PI * 2.0
+            lat = Math.toDegrees(lat)
+            lon = Math.toDegrees(lon)
+            positions.add(GeoPos(lat, lon))
+            tempAzimuth += 1
+        }
+        return positions
+    }
+
+    fun getRangeCircleRadiusKm(): Double {
+        return earthRadiusKm * acos(earthRadiusKm / (earthRadiusKm + altitude))
+    }
+}

data/src/main/java/com/rtbishop/look4sat/domain/predict/Satellite.kt

@@ -0,0 +1,338 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.domain.predict
+
+import kotlin.math.*
+
+abstract class Satellite(val data: OrbitalData) {
+
+    private val flatFactor = 3.35281066474748E-3
+    private val deg2Rad = 1.745329251994330E-2
+    private val secPerDay = 8.6400E4
+    private val minPerDay = 1.44E3
+    private val epsilon = 1.0E-12
+    private val position = Vector4()
+    private val velocity = Vector4()
+    private var gsPosTheta = 0.0
+    private var perigee = 0.0
+    val orbitalPeriod = 24 * 60 / data.meanmo
+    val earthRadius = 6378.137
+    val j3Harmonic = -2.53881E-6
+    val twoPi = Math.PI * 2.0
+    val twoThirds = 2.0 / 3.0
+    val xke = 7.43669161E-2
+    val ck2 = 5.413079E-4
+    val ck4 = 6.209887E-7
+    var qoms24 = 0.0
+    var s4 = 0.0
+
+    internal fun willBeSeen(pos: GeoPos): Boolean {
+        return if (data.meanmo < 1e-8) false
+        else {
+            val sma = 331.25 * exp(ln(1440.0 / data.meanmo) * (2.0 / 3.0))
+            val apogee = sma * (1.0 + data.eccn) - earthRadius
+            var lin = data.incl
+            if (lin >= 90.0) lin = 180.0 - lin
+            acos(earthRadius / (apogee + earthRadius)) + lin * deg2Rad > abs(pos.latitude * deg2Rad)
+        }
+    }
+
+    internal fun getPosition(pos: GeoPos, time: Long): SatPos {
+        val satPos = SatPos()
+        // Date/time at which the position and velocity were calculated
+        val julUTC = calcCurrentDaynum(time) + 2444238.5
+        // Convert satellite's epoch time to Julian and calculate time since epoch in minutes
+        val julEpoch = juliandDateOfEpoch(data.epoch)
+        val tsince = (julUTC - julEpoch) * minPerDay
+        calculateSDP4orSGP4(tsince)
+        // Scale position and velocity vectors to km and km/sec
+        convertSatState(position, velocity)
+        // Calculate velocity of satellite
+        magnitude(velocity)
+        val squintVector = Vector4()
+        // Angles in rads, dist in km, vel in km/S. Calculate sat Az, El, Range and Range-rate.
+        calculateObs(julUTC, position, velocity, pos, squintVector, satPos)
+        calculateLatLonAlt(julUTC, satPos, position)
+        return satPos.apply { this.time = time }
+    }
+
+    // Read the system clock and return the number of days since 31Dec79 00:00:00 UTC (daynum 0)
+    private fun calcCurrentDaynum(now: Long): Double {
+        val then = 315446400000 // time in millis on 31Dec79 00:00:00 UTC (daynum 0)
+        val millis = now - then
+        return millis / 1000.0 / 60.0 / 60.0 / 24.0
+    }
+
+    private fun juliandDateOfEpoch(epoch: Double): Double {
+        var year = floor(epoch * 1E-3)
+        val day = (epoch * 1E-3 - year) * 1000.0
+        year = if (year < 57) year + 2000 else year + 1900
+        return julianDateOfYear(year) + day
+    }
+
+    internal fun julianDateOfYear(theYear: Double): Double {
+        val aYear = theYear - 1
+        var i = floor(aYear / 100).toLong()
+        val a = i
+        i = a / 4
+        val b = 2 - a + i
+        i = floor(365.25 * aYear).toLong()
+        i += (30.6001 * 14).toLong()
+        return i + 1720994.5 + b
+    }
+
+    private fun calculateSDP4orSGP4(tsince: Double) {
+        if (data.isDeepspace) (this as DeepSpaceSat).calculateSDP4(tsince)
+        else (this as NearEarthSat).calculateSGP4(tsince)
+    }
+
+    // Converts the sat position and velocity vectors to km and km/sec
+    private fun convertSatState(pos: Vector4, vel: Vector4) {
+        scaleVector(earthRadius, pos)
+        scaleVector(earthRadius * minPerDay / secPerDay, vel)
+    }
+
+    // Calculates the topocentric coordinates of the object with ECI pos and vel at time
+    private fun calculateObs(
+        julianUTC: Double,
+        positionVector: Vector4,
+        velocityVector: Vector4,
+        gsPos: GeoPos,
+        squintVector: Vector4,
+        satPos: SatPos
+    ) {
+        val obsPos = Vector4()
+        val obsVel = Vector4()
+        val range = Vector4()
+        val rgvel = Vector4()
+        calculateUserPosVel(julianUTC, gsPos, obsPos, obsVel)
+        range.setXYZ(
+            positionVector.x - obsPos.x,
+            positionVector.y - obsPos.y,
+            positionVector.z - obsPos.z
+        )
+        // Save these values globally for calculating squint angles later
+        squintVector.setXYZ(range.x, range.y, range.z)
+        rgvel.setXYZ(
+            velocityVector.x - obsVel.x,
+            velocityVector.y - obsVel.y,
+            velocityVector.z - obsVel.z
+        )
+        magnitude(range)
+        val sinLat = sin(deg2Rad * gsPos.latitude)
+        val cosLat = cos(deg2Rad * gsPos.latitude)
+        val sinTheta = sin(gsPosTheta)
+        val cosTheta = cos(gsPosTheta)
+        val topS = sinLat * cosTheta * range.x + sinLat * sinTheta * range.y - cosLat * range.z
+        val topE = -sinTheta * range.x + cosTheta * range.y
+        val topZ = cosLat * cosTheta * range.x + cosLat * sinTheta * range.y + sinLat * range.z
+        var azim = atan(-topE / topS)
+        if (topS > 0.0) azim += Math.PI
+        if (azim < 0.0) azim += twoPi
+        satPos.azimuth = azim
+        satPos.elevation = asin(topZ / range.w)
+        satPos.distance = range.w
+        satPos.distanceRate = dot(range, rgvel) / range.w
+    }
+
+    // Returns the ECI position and velocity of the observer
+    private fun calculateUserPosVel(
+        time: Double,
+        gsPos: GeoPos,
+        obsPos: Vector4,
+        obsVel: Vector4
+    ) {
+        val mFactor = 7.292115E-5
+        gsPosTheta = mod2PI(thetaGJD(time) + deg2Rad * gsPos.longitude)
+        val c =
+            invert(sqrt(1.0 + flatFactor * (flatFactor - 2) * sqr(sin(deg2Rad * gsPos.latitude))))
+        val sq = sqr(1.0 - flatFactor) * c
+        val achcp = (earthRadius * c) * cos(deg2Rad * gsPos.latitude)
+        obsPos.setXYZ(
+            achcp * cos(gsPosTheta), achcp * sin(gsPosTheta),
+            (earthRadius * sq) * sin(deg2Rad * gsPos.latitude)
+        )
+        obsVel.setXYZ(-mFactor * obsPos.y, mFactor * obsPos.x, 0.0)
+        magnitude(obsPos)
+        magnitude(obsVel)
+    }
+
+    // Calculate the geodetic position of an object given its ECI pos and time
+    private fun calculateLatLonAlt(
+        time: Double,
+        satPos: SatPos,
+        position: Vector4 = this.position
+    ) {
+        satPos.theta = atan2(position.y, position.x)
+        satPos.longitude = mod2PI(satPos.theta - thetaGJD(time))
+        val r = sqrt(sqr(position.x) + sqr(position.y))
+        val e2 = flatFactor * (2.0 - flatFactor)
+        satPos.latitude = atan2(position.z, r)
+        var phi: Double
+        var c: Double
+        var i = 0
+        var converged: Boolean
+        do {
+            phi = satPos.latitude
+            c = invert(sqrt(1.0 - e2 * sqr(sin(phi))))
+            satPos.latitude = atan2(position.z + earthRadius * c * e2 * sin(phi), r)
+            converged = abs(satPos.latitude - phi) < epsilon
+        } while (i++ < 10 && !converged)
+        satPos.altitude = r / cos(satPos.latitude) - earthRadius * c
+        var temp = satPos.latitude
+        if (temp > Math.PI / 2.0) {
+            temp -= twoPi
+            satPos.latitude = temp
+        }
+    }
+
+    internal fun calculatePosAndVel(
+        rk: Double, uk: Double, xnodek: Double,
+        xinck: Double, rdotk: Double, rfdotk: Double
+    ) {
+        // Orientation vectors
+        val sinuk = sin(uk)
+        val cosuk = cos(uk)
+        val sinik = sin(xinck)
+        val cosik = cos(xinck)
+        val sinnok = sin(xnodek)
+        val cosnok = cos(xnodek)
+        val xmx = -sinnok * cosik
+        val xmy = cosnok * cosik
+        val ux = xmx * sinuk + cosnok * cosuk
+        val uy = xmy * sinuk + sinnok * cosuk
+        val uz = sinik * sinuk
+        val vx = xmx * cosuk - cosnok * sinuk
+        val vy = xmy * cosuk - sinnok * sinuk
+        val vz = sinik * cosuk
+        // Position and velocity
+        position.setXYZ(ux, uy, uz)
+        position.multiply(rk)
+        velocity.x = rdotk * ux + rfdotk * vx
+        velocity.y = rdotk * uy + rfdotk * vy
+        velocity.z = rdotk * uz + rfdotk * vz
+    }
+
+    internal class Vector4 {
+        var w = 0.0
+        var x = 0.0
+        var y = 0.0
+        var z = 0.0
+
+        fun multiply(multiplier: Double) {
+            x *= multiplier
+            y *= multiplier
+            z *= multiplier
+        }
+
+        fun setXYZ(xValue: Double, yValue: Double, zValue: Double) {
+            x = xValue
+            y = yValue
+            z = zValue
+        }
+    }
+
+    internal fun sqr(arg: Double): Double {
+        return arg * arg
+    }
+
+    internal fun invert(value: Double): Double {
+        return 1.0 / value
+    }
+
+    // Calculates the modulus of 2 * PI
+    internal fun mod2PI(value: Double): Double {
+        var retVal = value
+        val i = (retVal / twoPi).toInt()
+        retVal -= i * twoPi
+        if (retVal < 0.0) retVal += twoPi
+        return retVal
+    }
+
+    // Solves Keplers' Equation
+    internal fun converge(temp: DoubleArray, axn: Double, ayn: Double, capu: Double) {
+        var converged = false
+        var i = 0
+        do {
+            temp[7] = sin(temp[2])
+            temp[8] = cos(temp[2])
+            temp[3] = axn * temp[7]
+            temp[4] = ayn * temp[8]
+            temp[5] = axn * temp[8]
+            temp[6] = ayn * temp[7]
+            val epw = (capu - temp[4] + temp[3] - temp[2]) / (1.0 - temp[5] - temp[6]) + temp[2]
+            if (abs(epw - temp[2]) <= epsilon) converged = true else temp[2] = epw
+        } while (i++ < 10 && !converged)
+    }
+
+    // Sets perigee and checks and adjusts the calculation if the perigee is less tan 156KM
+    internal fun setPerigee(perigee: Double) {
+        this.perigee = perigee
+        checkPerigee()
+    }
+
+    // Checks and adjusts the calculation if the perigee is less tan 156KM
+    private fun checkPerigee() {
+        s4 = 1.012229
+        qoms24 = 1.880279E-09
+        if (perigee < 156.0) {
+            s4 = if (perigee <= 98.0) 20.0 else perigee - 78.0
+            qoms24 = ((120 - s4) / earthRadius).pow(4.0)
+            s4 = s4 / earthRadius + 1.0
+        }
+    }
+
+    // Calculates the dot product of two vectors
+    private fun dot(v1: Vector4, v2: Vector4): Double {
+        return v1.x * v2.x + v1.y * v2.y + v1.z * v2.z
+    }
+
+    // Returns fractional part of double argument
+    private fun fraction(arg: Double): Double {
+        return arg - floor(arg)
+    }
+
+    // Calculates scalar magnitude of a vector4 argument
+    private fun magnitude(v: Vector4) {
+        v.w = sqrt(sqr(v.x) + sqr(v.y) + sqr(v.z))
+    }
+
+    private fun modulus(arg1: Double): Double {
+        var returnValue = arg1
+        val i = floor(returnValue / secPerDay).toInt()
+        returnValue -= i * secPerDay
+        if (returnValue < 0.0) returnValue += secPerDay
+        return returnValue
+    }
+
+    // Multiplies the vector v1 by the scalar k
+    private fun scaleVector(k: Double, v: Vector4) {
+        v.multiply(k)
+        magnitude(v)
+    }
+
+    private fun thetaGJD(theJD: Double): Double {
+        val earthRotPerSidDay = 1.00273790934
+        val ut = fraction(theJD + 0.5)
+        val aJD = theJD - ut
+        val tu = (aJD - 2451545.0) / 36525.0
+        var gmst = 24110.54841 + tu * (8640184.812866 + tu * (0.093104 - tu * 6.2E-6))
+        gmst = modulus(gmst + secPerDay * earthRotPerSidDay * ut)
+        return twoPi * gmst / secPerDay
+    }
+}

data/src/test/java/com/rtbishop/look4sat/DataParserTest.kt

@@ -0,0 +1,101 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat
+
+import com.rtbishop.look4sat.data.DataParser
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.StandardTestDispatcher
+import kotlinx.coroutines.test.runTest
+import org.junit.Test
+
+@ExperimentalCoroutinesApi
+class DataParserTest {
+
+    private val testDispatcher = StandardTestDispatcher()
+    private val dataParser = DataParser(testDispatcher)
+    private val validCSVStream = """
+        OBJECT_NAME,OBJECT_ID,EPOCH,MEAN_MOTION,ECCENTRICITY,INCLINATION,RA_OF_ASC_NODE,ARG_OF_PERICENTER,MEAN_ANOMALY,EPHEMERIS_TYPE,CLASSIFICATION_TYPE,NORAD_CAT_ID,ELEMENT_SET_NO,REV_AT_EPOCH,BSTAR,MEAN_MOTION_DOT,MEAN_MOTION_DDOT
+        ISS (ZARYA),1998-067A,2021-11-16T12:28:09.322176,15.48582035,.0004694,51.6447,309.4881,203.6966,299.8876,0,U,25544,999,31220,.31985E-4,.1288E-4,0
+        FLTSATCOM 8 (USA 46),1989-077A,2022-01-07T11:37:38.074080,1.00273350,.0001114,12.9044,1.3272,91.5769,260.4200,0,U,20253,999,24434,0,-.85E-6,0
+    """.trimIndent().byteInputStream()
+    private val invalidCSVStream = """
+        ISS (ZARYA),1998-067A,2021-11-16T12:28:09.322176,15.48582035,.0004694,51.6447,309.4881,203.6966,299.8876,0,U,25544,999,31220,.31985E-4,.1288E-4,0
+        OBJECT_NAME,OBJECT_ID,EPOCH,MEAN_MOTION,ECCENTRICITY,INCLINATION,RA_OF_ASC_NODE,ARG_OF_PERICENTER,MEAN_ANOMALY,EPHEMERIS_TYPE,CLASSIFICATION_TYPE,NORAD_CAT_ID,ELEMENT_SET_NO,REV_AT_EPOCH,BSTAR,MEAN_MOTION_DOT,MEAN_MOTION_DDOT
+    """.trimIndent().byteInputStream()
+    private val validTLEStream = """
+        ISS (ZARYA)
+        1 25544U 98067A   21320.51955234  .00001288  00000+0  31985-4 0  9990
+        2 25544  51.6447 309.4881 0004694 203.6966 299.8876 15.48582035312205
+        FLTSATCOM 8 (USA 46)
+        1 20253U 89077A   22007.48446845 -.00000085  00000+0  00000+0 0  9999
+        2 20253  12.9044   1.3272 0001114  91.5769 260.4200  1.00273350244345
+    """.trimIndent().byteInputStream()
+    private val invalidTLEStream = """
+        1 25544U 98067A   21320.51955234  .00001288  00000+0  31985-4 0  9990
+        2 25544  51.6447 309.4881 0004694 203.6966 299.8876 15.48582035312205
+    """.trimIndent().byteInputStream()
+    private val validJSONStream = """
+        [{"uuid":"UzPz4gcsNBPKPKAFPmer7g","description":"Upper side band (drifting)","alive":true,"type":"Transmitter","uplink_low":null,"uplink_high":null,"uplink_drift":null,"downlink_low":136658500,"downlink_high":null,"downlink_drift":null,"mode":"USB","mode_id":9,"uplink_mode":null,"invert":false,"baud":null,"sat_id":"SCHX-0895-2361-9925-0309","norad_cat_id":965,"status":"active","updated":"2019-04-18T05:39:53.343316Z","citation":"CITATION NEEDED - https://xkcd.com/285/","service":"Unknown","coordination":"","coordination_url":""}]
+    """.trimIndent().byteInputStream()
+    private val invalidJSONStream = """
+        [{"description":"Upper side band (drifting)","alive":true,"type":"Transmitter","uplink_low":null,"uplink_high":null,"uplink_drift":null,"downlink_low":136658500,"downlink_high":null,"downlink_drift":null,"mode":"USB","mode_id":9,"uplink_mode":null,"invert":false,"baud":null,"sat_id":"SCHX-0895-2361-9925-0309","norad_cat_id":965,"status":"active","updated":"2019-04-18T05:39:53.343316Z","citation":"CITATION NEEDED - https://xkcd.com/285/","service":"Unknown","coordination":"","coordination_url":""}]
+    """.trimIndent().byteInputStream()
+
+    @Test
+    fun `Given valid CSV stream returns valid data`() = runTest(testDispatcher) {
+        val parsedList = dataParser.parseCSVStream(validCSVStream)
+        assert(parsedList[0].epoch == 21320.51955234)
+    }
+
+    @Test
+    fun `Given invalid CSV stream returns empty list`() = runTest(testDispatcher) {
+        val parsedList = dataParser.parseCSVStream(invalidCSVStream)
+        assert(parsedList.isEmpty())
+    }
+
+    @Test
+    fun `Given valid TLE stream returns valid data`() = runTest(testDispatcher) {
+        val parsedList = dataParser.parseTLEStream(validTLEStream)
+        assert(parsedList[0].epoch == 21320.51955234)
+    }
+
+    @Test
+    fun `Given invalid TLE stream returns empty list`() = runTest(testDispatcher) {
+        val parsedList = dataParser.parseTLEStream(invalidTLEStream)
+        assert(parsedList.isEmpty())
+    }
+
+    @Test
+    fun `Given valid data streams parsed results match`() = runTest(testDispatcher) {
+        val csvResult = dataParser.parseCSVStream(validCSVStream)
+        val tleResult = dataParser.parseTLEStream(validTLEStream)
+        assert(csvResult == tleResult)
+    }
+
+    @Test
+    fun `Given valid JSON stream returns valid data`() = runTest(testDispatcher) {
+        val parsedList = dataParser.parseJSONStream(validJSONStream)
+        assert(parsedList[0].downlink == 136658500L)
+    }
+
+    @Test
+    fun `Given invalid JSON stream returns empty list`() = runTest(testDispatcher) {
+        val parsedList = dataParser.parseJSONStream(invalidJSONStream)
+        assert(parsedList.isEmpty())
+    }
+}

data/src/test/java/com/rtbishop/look4sat/QthConverterTest.kt

@@ -0,0 +1,53 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2022 Arty Bishop (bishop.arty@gmail.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat
+
+import com.rtbishop.look4sat.domain.QthConverter
+import org.junit.Test
+
+class QthConverterTest {
+
+    @Test
+    fun `Given valid QTH returns correct POS`() {
+        var result = QthConverter.qthToPosition("io91VL39FX")
+        assert(result?.latitude == 51.4792 && result.longitude == -0.2083)
+        result = QthConverter.qthToPosition("JN58TD")
+        assert(result?.latitude == 48.1458 && result.longitude == 11.6250)
+        result = QthConverter.qthToPosition("gf15vc")
+        assert(result?.latitude == -34.8958 && result.longitude == -56.2083)
+    }
+
+    @Test
+    fun `Given invalid QTH returns null`() {
+        assert(QthConverter.qthToPosition("ZZ00zz") == null)
+        assert(QthConverter.qthToPosition("JN58") == null)
+    }
+
+    @Test
+    fun `Given valid POS returns correct QTH`() {
+        assert(QthConverter.positionToQth(51.4878, -0.2146) == "IO91vl")
+        assert(QthConverter.positionToQth(48.1466, 11.6083) == "JN58td")
+        assert(QthConverter.positionToQth(-34.91, -56.2116) == "GF15vc")
+    }
+
+    @Test
+    fun `Given invalid POS returns null`() {
+        assert(QthConverter.positionToQth(91.0542, -170.1142) == null)
+        assert(QthConverter.positionToQth(89.0542, -240.1142) == null)
+    }
+}