mirror of
https://github.com/atsunatsu/Look4Sat.git
synced 2026-10-06 20:47:22 +00:00
atsunatsu
5d792a0fc8
The passband mapping happens on the satellite, so both legs of the trip must carry their own Doppler shift: the uplink shift before the mapping and the downlink shift after it. The previous implementation mapped the ground frequency first and applied a single shift, so TX to RX missed the uplink Doppler and the reverse computation missed the downlink one. Neither function was the inverse of the other - switching the TX/RX anchor in the calculator jumped the frequencies by (uplink + downlink) Doppler, 13.5 kHz at 7 km/s for a U/V transponder. Adds exact-value and round-trip regressions at non-zero range rates.
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.