Hello , 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 small ..
Thanks in advance !
Hi,
- I need some more info about S band GMR - what sat is this , az / el ,
what trafic etc.
No clue. Hasn't been observed ... by me at least.
- 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 ?
On thuraya it's all encrypted AFAIK so you won't get anything if you don't have the key.
- 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 small ..
The G / g matrix are small, nothing big to them. And no, I don't have any plan for integration of any crypto break inside the open-source osmo-gmr itself. If you have commercial need for it, you can contact me privately.
Cheers,
Sylvain
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Anton Minchev -
Sylvain Munaut