Is anybody else working on decoding the Falcon 9 telemetry?

[hamster_nz]

I'm working on it to learn a little more SDR techniques, and to understand a bit more about telemetry standards in general..

Mine is more of a programming project than a using 'GNUradio" or "satdump"...

[hamster_nz]

I'm getting somewhere... can demodulate the I+Q signal, recover the bits, find the framing, and remove the pseudo-random scrambling.

Can now see the GPS debug text... now need to learn a lot more about the CCSDS protocol.

Code: [Select]

1ACFFC1D  460688452  (  2558:0) .j...}.....1....p...$'.....Kx4016> so.ution tnw:37423.9005.08231, w.:2149.1299752624367933861> 14 PLL stress.1299752644.
                                E0 6A A4 00 B0 7D 01 17 CE 08 00 31 03 03 02 00 70 12 09 A6 24 27 09 12 1C 00 DA 4B 78 34 30 31 36 3E 20 73 6F EC 75 74
--
1ACFFC1D  482124492  (  1279:0) .....}.....2....p...!...K..O.is(valid: 1) for GPS L1CA 32, fi:14400.1299752629281687460> New ephemeris(valid: 1) for GPS
                                E0 AC 18 00 F0 7D 01 17 FE 08 00 32 03 03 02 00 70 12 09 A6 21 8C BF EF 4B 00 DE 4F 9B 69 73 28 76 61 6C 69 64 3A 20 31
--
1ACFFC1D  484262980  (  1279:0) .....}.....2....p...!...*..P.GPS L1CA 28, fi:14400.1299752629286462898> New ephemeris(valid: 1) for GPS L1CA 14, fi:1440
                                E0 B2 A0 00 F0 7D 01 17 FE 08 00 32 03 03 02 00 70 12 09 A6 21 B0 84 83 2A 00 DE 50 C7 47 50 53 20 4C 31 43 41 20 32 38
--
1ACFFC1D  486411700  (  1279:0) ..0..}.....2....p...!.G....Q.4400.1299752630899779716> Track: [21e 22e 25s 01s 14e 32s 20s 23s 10s  .  . $.  .  .  *  .
                                E0 B9 30 00 F0 7D 01 17 FE 08 00 32 03 03 02 00 70 12 09 A6 21 D4 47 EE 0D 00 DE 51 F3 34 34 30 30 0A 31 32 39 39 37 35
--
1ACFFC1D  499263092  (  1279:0) ..0..<.....2..../..."......T.129.752635203819476> 14 PLL stress.#....."...........`].'.......H...."...........`...Z.+.
                                E0 E0 30 00 F0 3C 01 17 FE 08 00 32 03 03 02 00 2F 12 09 A6 22 AA D7 1E A9 00 DE 54 04 31 32 39 B9 37 35 32 36 33 35 32
--
1ACFFC1D  499979332  (  1279:0) .....Z.....2....M...".._...T'1299752635298822666> Channel 17, SID 2 got TOW H 12290: 354.5208.5....."...............Z..
                                E0 E2 A0 00 F0 5A 01 17 FE 08 00 32 03 03 02 00 4D 12 09 A6 22 B6 C2 5F 09 00 DE 54 27 31 32 39 39 37 35 32 36 33 35 32
--
1ACFFC1D  537837732  (  1279:0) .V@..}.....2....p...%..t_..W.1299752645900141511> 23 low CN0 too long, dropping (@ 77830231096000000.000).12997526459012
                                E0 56 40 00 F0 7D 01 17 FE 08 00 32 03 03 02 00 70 12 09 A6 25 2E A1 74 5F 00 DE 57 98 31 32 39 39 37 35 32 36 34 35 39
--
1ACFFC1D  587831284  (  1279:0) .....}.....2....p...(q.....^.for GPS L1CA 10, fi:14400.1299752659280612710> New ephemeris(valid: 1) for GPS L1CA 23, fi:
                                E0 EE F0 00 F0 7D 01 17 FE 08 00 32 03 03 02 00 70 12 09 A6 28 71 0B BA D1 00 DE 5E C9 66 6F 72 20 47 50 53 20 4C 31 43
--
1ACFFC1D  588547524  (  1279:0) .. ....7a.].'..1A.P...}.....2....p...(|....._-9752659280812646> New ephemeris(valid: 1) for GPS L1CA 13, fi:14400.129975
                                E0 F1 20 11 A5 DB 99 37 61 18 5D EE 27 AA 15 31 41 0E 50 12 FD F0 7D 01 17 FE 08 00 32 03 03 02 00 70 12 09 A6 28 7C EE
--
1ACFFC1D  589263764  (  1279:0) ..P..}.....2....p...(..t..._.is(valid: 1) for GPS L1CA 25, fi:14400.1299752659281874400> New ephemeris(valid: 1) for GPS
                                E0 F3 50 00 F0 7D 01 17 FE 08 00 32 03 03 02 00 70 12 09 A6 28 88 EA 74 2E 00 DE 5F 91 69 73 28 76 61 6C 69 64 3A 20 31
--



[nali]

I saw that Scott Manley did a video on the subject


Link from his description
https://www.r00t.cz/Sats/Falcon9

[DiTBho]

I don't work with rockets but I have recently developed my own protocol. It's simple, but it uses symmetric encryption (Blowfish) at the transport layer.

[hamster_nz]

I saw that Scott Manley did a video on the subject


Link from his description
https://www.r00t.cz/Sats/Falcon9

Ah! That answers the missing bit I was up to... they are using custom framing embedder in the CCSDS stream.

[coromonadalix]

I think they have encrypted  the telemetry ....