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Further changes to predict4kotlin classes
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Arty Bishop committed
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package com.rtbishop.look4sat.domain.predict4kotlin
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import java.util.*
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import kotlin.math.*
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const val speedOfLight = 2.99792458E8
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const val earthRadiusKm = 6378.16
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fun Satellite.getQuarterOrbitMin(): Int {
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return (24.0 * 60.0 / this.tle.meanmo / 4.0).toInt()
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}
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fun SatPos.getRangeCircle(): List<Position> {
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val positions = mutableListOf<Position>()
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val lat = this.latitude
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val lon = this.longitude
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// rangeCircleRadiusKm
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// earthRadiusKm * acos(earthRadiusKm / (earthRadiusKm + satPos.altitude))
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val beta = acos(earthRadiusKm / (earthRadiusKm + this.altitude))
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var tempAzimuth = 0
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while (tempAzimuth < 360) {
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val azimuth = tempAzimuth / 360.0 * 2.0 * Math.PI
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var rangelat = asin(sin(lat) * cos(beta) + cos(azimuth) * sin(beta) * cos(lat))
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val num = (cos(beta) - (sin(lat) * sin(rangelat)))
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val den = cos(lat) * cos(rangelat)
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var rangelon = if (tempAzimuth == 0 && (beta > ((Math.PI / 2.0) - lat))) {
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lon + Math.PI
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} else if (tempAzimuth == 180 && (beta > ((Math.PI / 2.0) - lat))) {
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lon + Math.PI
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} else if (abs(num / den) > 1.0) {
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lon
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} else {
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if ((180 - tempAzimuth) >= 0) {
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lon - acos(num / den)
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} else {
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lon + acos(num / den)
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}
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}
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while (rangelon < 0.0) rangelon += Math.PI * 2.0
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while (rangelon > Math.PI * 2.0) rangelon -= Math.PI * 2.0
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rangelat = Math.toDegrees(rangelat)
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rangelon = Math.toDegrees(rangelon)
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positions.add(Position(rangelat, rangelon))
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tempAzimuth += 1
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}
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return positions
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}
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fun SatPos.getDownlinkFreq(freq: Long): Long {
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return (freq.toDouble() * (speedOfLight - this.rangeRate * 1000.0) / speedOfLight).toLong()
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}
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fun SatPos.getUplinkFreq(freq: Long): Long {
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return (freq.toDouble() * (speedOfLight + this.rangeRate * 1000.0) / speedOfLight).toLong()
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}
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fun Satellite.getSatPos(date: Date): SatPos {
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return this.getPosition(stationPos, date)
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}
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fun Satellite.getPositions(date: Date, stepSec: Int, minBefore: Int, orbits: Double): List<SatPos> {
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val positions = mutableListOf<SatPos>()
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val orbitalPeriod = 24 * 60 / this.tle.meanmo
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val endDate = Date(date.time + (orbitalPeriod * orbits * 60L * 1000L).toLong())
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val startDate = Date(date.time - minBefore * 60L * 1000L)
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var currentDate = startDate
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while (currentDate.before(endDate)) {
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positions.add(getSatPos(currentDate))
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currentDate = Date(currentDate.time + stepSec * 1000)
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}
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return positions
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}
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fun Satellite.getPasses(refDate: Date, hoursAhead: Int, windBack: Boolean): List<SatPass> {
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val passes = mutableListOf<SatPass>()
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val oneQuarterOrbitMin = this.getQuarterOrbitMin()
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val endDate = Date(refDate.time + hoursAhead * 60L * 60L * 1000L)
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var startDate = refDate
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var shouldWindBack = windBack
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var lastAosDate: Date
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var count = 0
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if (this.willBeSeen(stationPos)) {
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if (this.tle.isDeepspace) {
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passes.add(nextDeepSpacePass(refDate))
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} else {
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do {
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if (count > 0) shouldWindBack = false
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val pass = nextNearEarthPass(startDate, shouldWindBack)
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lastAosDate = pass.aosDate
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passes.add(pass)
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startDate =
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Date(pass.losDate.time + (oneQuarterOrbitMin * 3) * 60L * 1000L)
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count++
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} while (lastAosDate < endDate)
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}
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}
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return passes
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}
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private fun Satellite.nextDeepSpacePass(refDate: Date): SatPass {
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val satPos = getSatPos(refDate)
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val id = this.tle.catnum
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val name = this.tle.name
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val isDeep = this.tle.isDeepspace
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val aos = Date(refDate.time - 24 * 60L * 60L * 1000L).time
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val los = Date(refDate.time + 24 * 60L * 60L * 1000L).time
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val tca = Date((aos + los) / 2).time
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val az = Math.toDegrees(satPos.azimuth)
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val elev = Math.toDegrees(satPos.elevation)
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val alt = satPos.altitude
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return SatPass(id, name, isDeep, aos, az, los, az, tca, az, alt, elev, this)
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}
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private fun Satellite.nextNearEarthPass(refDate: Date, windBack: Boolean = false): SatPass {
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val oneQuarterOrbitMin = this.getQuarterOrbitMin()
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val calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC")).apply {
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clear()
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timeInMillis = refDate.time
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}
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val id = this.tle.catnum
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val name = this.tle.name
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val isDeep = this.tle.isDeepspace
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var elevation: Double
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var maxElevation = 0.0
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var alt = 0.0
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var tcaAz = 0.0
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// wind back time 1/4 of an orbit
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if (windBack) calendar.add(Calendar.MINUTE, -oneQuarterOrbitMin)
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var satPos = getSatPos(calendar.time)
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if (satPos.elevation > 0.0) {
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// move forward in 30 second intervals until the sat goes below the horizon
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do {
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calendar.add(Calendar.SECOND, 30)
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satPos = getSatPos(calendar.time)
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} while (satPos.elevation > 0.0)
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// move forward 3/4 of an orbit
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calendar.add(Calendar.MINUTE, oneQuarterOrbitMin * 3)
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}
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// find the next time sat comes above the horizon
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do {
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calendar.add(Calendar.SECOND, 60)
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satPos = getSatPos(calendar.time)
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elevation = satPos.elevation
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if (elevation > maxElevation) {
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maxElevation = elevation
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alt = satPos.altitude
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tcaAz = Math.toDegrees(satPos.azimuth)
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}
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} while (satPos.elevation < 0.0)
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// refine to 3 seconds
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calendar.add(Calendar.SECOND, -60)
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do {
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calendar.add(Calendar.SECOND, 3)
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satPos = getSatPos(calendar.time)
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elevation = satPos.elevation
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if (elevation > maxElevation) {
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maxElevation = elevation
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alt = satPos.altitude
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tcaAz = Math.toDegrees(satPos.azimuth)
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}
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} while (satPos.elevation < 0.0)
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val aos = satPos.time.time
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val aosAz = Math.toDegrees(satPos.azimuth)
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// find when sat goes below
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do {
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calendar.add(Calendar.SECOND, 30)
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satPos = getSatPos(calendar.time)
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elevation = satPos.elevation
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if (elevation > maxElevation) {
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maxElevation = elevation
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alt = satPos.altitude
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tcaAz = Math.toDegrees(satPos.azimuth)
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}
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} while (satPos.elevation > 0.0)
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// refine to 3 seconds
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calendar.add(Calendar.SECOND, -30)
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do {
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calendar.add(Calendar.SECOND, 3)
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satPos = getSatPos(calendar.time)
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elevation = satPos.elevation
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if (elevation > maxElevation) {
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maxElevation = elevation
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alt = satPos.altitude
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tcaAz = Math.toDegrees(satPos.azimuth)
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}
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} while (satPos.elevation > 0.0)
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val los = satPos.time.time
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val losAz = Math.toDegrees(satPos.azimuth)
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val tca = Date((aos + los) / 2).time
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val elev = Math.toDegrees(maxElevation)
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return SatPass(id, name, isDeep, aos, aosAz, los, losAz, tca, tcaAz, alt, elev, this)
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}
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