GitHub/sdrtrunk
1
0
Fork 0
mirror of https://github.com/DSheirer/sdrtrunk.git synced 2026-11-14 01:27:34 -05:00
Code Issues Packages Projects Releases 2 Wiki Activity

P25 LSM decoder work in progress. Adds a CQPSK decoder based on Max's (KA1RBI) scope.py and gardner loop.

Browse Source 
The CQPSK decoder is starting to take shape, but needs more tweaking and testing.  It's not keeping a good lock on strong P25 signals.  I have to add some more features to the intrumentation package to allow me to visualize the internals of the CQPSK decoder so that I can get a better sense of what needs fine tuning.

The CQPSK decoder may work for anyone that wants to sync the repo and run the build script.
This commit is contained in:
dennis.sheirer
2015-02-10 00:42:08 +00:00
parent 9310fb0daf
commit a65e821e85
43 changed files with 1996 additions and 413 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/dsp/nbfm/FMDiscriminator.java
View File

@@ -74,7 +74,7 @@ public class FMDiscriminator implements Listener<ComplexSample>
else
{
/**
* Use the arcus tangent of imaginary (q) divided by real (i) to
* Use the arc-tangent of imaginary (q) divided by real (i) to
* get the phase angle (+/-) which was directly manipulated by the
* original message waveform during the modulation. This value now
* serves as the instantaneous amplitude of the demodulated signal