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gr-droneid-3.8
proto17 2022-04-07 23:41:23 -04:00 zatwierdzone przez GitHub
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@ -83,3 +83,5 @@ As mentioned above, there are 9 OFDM symbols.
The 4th and 6th symbols (1-based) appear to be Zadoff-Chu (ZC) sequences (these are used in LTE and I know for a fact they are present in the uplink signal for Ocusync). The parameters for the ZC sequences are not known. I have first hand knowledge that the sequences are almost certainly not following the standard.
The remaining OFDM symbols carry just a QPSK. If there are pilots they are either QPSK pilots or a 45 degree offset BPSK. As pointed out by https://github.com/tmbinc/random/tree/master/dji/ocusync2 the DC carrier appears to always be sitting around 45 degrees with a much smaller amplitude than the data carriers. Not totally sure what's going on there.
## Open Source LTE Libs
I have had zero luck with my few attempts at getting open source LTE tools to understand what the DJI Mini 2 is sending out. My hunch is that this is due to DJI not following the standard to the letter. But, I know exceedingly little about LTE, so take that for what it's worth.