|Subject:||Modifying gr-adsb to Demodulate Uplink Format Messages|
|Date:||Tue, 17 Nov 2020 00:12:21 +0000|
I am currently working with the OOT module gr-adsb; as written, this module captures downlink format (DF) ADS-B messages. I am interested in modifying this OOT module to instead capture uplink format (UF) messages.
Within this module the framer block recognizes a message prefix and tags that message with an offset that tells the next block, the demodulator, which pieces of information to demodulate. DF messages require pulse position demodulation whereas UF messages require differential binary phase shift key demodulation. I’ve edited the framer to capture the UF prefix instead of the DF prefix, however I’m having trouble editing the demodulator. I’m currently pursuing two options:
If anyone is familiar with this OOT module, demodulation, or tagging in general I could use your help determining whether my thinking in tackling this problem is correct, whether the options I’m pursuing make sense, or if there are other options you’d recommend exploring. Any help is greatly appreciated! Please let me know if additional details are required.
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