mckero
fdb44af9ff
Two audit findings, both measured, both able to silently disable the feature. A detection window landing in a keying gap used to collapse an established shift to zero. CW is keyed, so gaps are normal: over 180 s of keyed audio at 1400 Hz, 11 of 90 detections saw no tone, and each one wiped the decode window and left the next ~2 s buffered unshifted - outside the model's range and therefore invisible to it. Absence of a tone is now absence of evidence and the active shift is retained. Hysteresis moved from shift space to tone space, anchored on the pitch that produced the active shift. The old rule required a non-zero previous shift and a needed shift, so it lapsed exactly where the jump is largest: at the 1200 Hz edge one 12.5 Hz estimate hop flips between "inside" (shift 0) and "outside" (a large shift). Measured 35 window drops in 60 detections for a 1205 Hz tone, and 10 in 10 for a bare one-bin hop. A shift of zero is a real state, not the absence of one. Slow drift still catches up, since the anchor bounds staleness at the margin rather than letting it accumulate. Detection prominence raised from 3.0 to 8.0. Pure noise peaks at 2.0-3.3 times its own spectral mean, so 3.0 admitted roughly one noise window in five as a "tone" - and a false tone is worse than none, since it moves a good signal out of range. Keyed CW measures 47-51, so the gap is wide. Shifted output is clamped to the +/-1.0 range the spectrogram assumes. The Hilbert kernel's L1 gain is 2.51, so mixing overshoots: a full-scale square wave measured 2.35 and even a plain sine 1.05. The detection pool moved to core:domain as CwDetectionPool so its ring behaviour can be tested directly - mutation testing showed the previous private implementation was unreachable from any test. Its chronological-order contract now has 11 tests driving the real class. Removed the write-only detectedToneHz field. 74 CW tests pass, golden vectors included.
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.