mckero
00b7b25cc1
The screen stamped System.currentTimeMillis() with no way to change it, which assumes contacts are typed as they happen. Serious satellite operators do not work that way: the documented practice from AMSAT and DX Engineering is to record the pass and transcribe it afterwards, because during eight minutes of a linear transponder there is no spare attention for a keyboard. Measured with a probe against a realistic pass - eight minutes, five contacts, twelve minutes to transcribe: every contact was stamped 10 to 12 minutes late. LoTW wants both sides within 30 minutes, so that survives a brisk transcription and fails a slow one. The case that fails outright is a pass crossing midnight UTC. Transcribing 23:58 at 00:05 the next day put the contact a full 24 hours in the future, which can never be confirmed. PassClock reads an absolute time later than now as belonging to the previous day, because passes cross midnight routinely and transcription always happens afterwards. One field takes both forms: an absolute UTC time (14:55 or 1455) or an offset (+3, -2m). A separate widget for each is more to reach for than an operator wants while holding an antenna. The parse is deliberately narrow - anything unclear is Unrecognised and the clock stays put, because a mis-parsed time silently backdates a contact and nothing downstream would catch it. The field says so while it is being typed rather than after committing. A held clock is shown in the primary colour, since logging at the wrong time silently is the failure this exists to prevent. The row is 48dp with Role.Button, like the mode row. PassClock is pure and lives in core:domain with 15 tests. The day boundary is passed in rather than computed there, because core:domain holds no calendar.
Look4Sat: Satellite tracker
Radio satellite tracker and pass predictor for Android, inspired by Gpredict
Track satellite passes with ease!
Thanks to Celestrak and SatNOGS you have access to over 9000 active satellites.
You can search the entire database by NORAD Catalog Number or the satellite's name.
Orbital positions and passes are calculated relative to your location.
To get reliable data make sure to set the station position via the app Settings.
The application is built using Kotlin, Coroutines, Jetpack Compose and Navigation.
It is now and always will be completely ad-free and open-source.
Main features:
- Predicting satellite positions and passes for up to 10 days
- Showing the list of currently active and upcoming satellite passes
- Showing the active pass progress, polar trajectory and transceivers info
- Showing the satellite positional data, footprint and ground track on the map
- Custom TLE satellite data import is available via Three Line Element .txt files
- Offline first: calculations are made offline. Weekly TLE data update is recommended.
License
The Look4Sat application code is licensed under the GNU General Public License v3.0.
The CW decoder in feature/cw bundles the DeepCW
neural decoding model, licensed under the GNU Affero General Public License v3.0 only
(AGPL-3.0-only). Because the combined work incorporates an AGPL-3.0 component, the
combined work is distributed under the
GNU Affero General Public License v3.0 — GPL-3.0 Section 13 permits the
combination, and AGPL-3.0 Section 13 applies to the combined work as a whole.
Model provenance and attribution are documented in
feature/cw/licenses/NOTICE.md; the original GPL-3.0
text is preserved at feature/cw/licenses/Look4Sat-GPL-3.0.txt. The CW model runs
locally on-device and does not provide services over a network.