mckero
ed1fe66892
clipLon reduced longitudes by looping += 360 until in range. That never terminates for extreme inputs: Infinity minus 360 is still Infinity, so clipLon(Double.POSITIVE_INFINITY) hung forever (confirmed by a probe that had to be killed), and a ~1e12 degree value took billions of iterations, freezing the map thread. NaN came back as NaN either way. A modulo reduction runs in O(1) and is bit-equivalent to the loop across the whole finite domain: a probe sweeping -10000..10000 at 0.01 degree steps (2 million points) plus the boundary values -180/-179.999/0/179.999/180/180.001/ ±360/±540 shows zero mismatches. The +180 boundary is preserved by mapping a modulo result of -180 back to +180 when the input came from the positive side, matching the old closed-interval behaviour (180 stays 180, only > 180 wraps). Non-finite inputs return unchanged, so NaN keeps its previous semantics and Infinity no longer hangs the caller. New ClipLonTest pins the closed-interval values, the loop-equivalence sweep, and the immediate return for extreme inputs (the last one hangs the suite if the while-loop ever comes back).
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.