I have made some captures on the L-band uplink channels and tried to decode
the RACH messages. All four consecutive TCH channels (according to the spot
beam) were recorded and a call was made during the recording.
I am using the GRC block gmr_rach_scan.grc. I have removed the IQ swap from
the graph, as suggested in the mailing list. The sampling rate and
samples-per-symbol values have been set to 93.6k and 4, respectively.
It ran fine without any errors, but I couldn't see any results either on
the wireshark or under /tmp/rach.txt.
Maybe I overlooked something here. Any ideas or remarks?
last week i worked with osmo-gmr projest ,but still have some questions:
1. I need some more info about S band GMR - what sat is this , az / el ,
what trafic etc.
2. About gmr1 ambe decode - i tried about dozens of .dat files from gmr1
rx live , some give me ! codec errors , some not , but all .wav audio
files are scrambled ,speesh is not recognized at all .. is there some
clear traffic at all, or all is A5/2 coded ?
3. If all is scrambled where i may find offline tables / H n matrix/,any
source that may generate them ? And if i have tables how they will be
integrated with existing osmo-gmr ? I see gmr1_gen_mat that generates
G/g matrix .. some more info about that .. .G and .g files seems so
Thanks in advance !