Eric A. Cottrell wrote: > Hello, > > I finally checked in the infamous Mode Select code to > branches/developers/wb1hbu/wip and I am glad this portion is done. > > I spent a couple of days cleaning the code up a little. I also added > some features. Likely I missed using a few neat gnuradio functions. > > There is a usrp_oscope_ms.py program that displays the Mode Select > signal, Reference Level, and Attributes. Triggering off of channel 2 > (Reference Level) allows the display of Mode Select waveforms. I made > the attributes go negative so they are more visible. I was surprised at > the results. > > The usrp_mode_s_logfile.py program outputs Mode Select frame information > to a log file. It does no decoding of the data. It logs the data bits > and other attributes of the signal and error correction. It is a good > program to run if you are in a heavy air traffic area and want to > generate megabytes of text within an hour. Hi Eric, I tried out your code. Does it run on your machine in realtime? I have a dual-core athlon X2 3800 and both processor go to 100 % when I run it. (I didn't know gnuradio could use both processors , I though we still had the single-threaded-scheduler)
This gives me a lot of USRP overruns (UoUoUo) so it doesn't work very well this way. Does mode-s really need a samplerate of 8000000 Another question. I know 1090 Mhz is the frequency they use in the US. I googled for info on frequencies for mode-s and ads-b and it seems multiple frequencies could be used. Does anyone know of an overview of the actual frequencies in use, at which places. (I live in the netherlands) Greetings, Martin I tried increasing the decimation but then the code refuses to run (requires 8000000 sps) > > 73 Eric > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
