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Big thanks goes to Paul from UHF-SATCOM for providing me recordings of this signal.
Modes seen so far:
Normal downlink uses CCSDS 1/6 Turbo coded frames with frame length of 8920 bits while failsafe uses 1/2 Turbo code with 3712 bit frames.
AOS frame protocol is used with spacecraft id 0xA8. So far only virtual channel 0 was in use.
Filler packets to APID 2047 contain following nice message from the team:
Note that this isn't first time I have found such message. SMAP satellite had similar message from JPL, see bottom of the S-band sats page for details.
CCSDS packets have 6 bytes of secondary header containing time stamp.
Active APIDs seen so far:
006 007 008 009 0F7 0FD 0FE 0FF 104 105 202
Not much data, but contains following ASCII text strings:seqctr seqeng sfp_15001 cmd upl
This is most active APID, probably containing all the basic telemetry. There is rather long header of about 60 bytes followed by list of tag+value pairs. A lot of double precision floating point data, as well as 32bit ints and other data types. Looks a lot like a serialized data from data object.
Data looks like download of stored recording of same data as used by APID 0x009. Data are fragmented to multiple packets and header does have fragment offset and other flags required for reassembly.
Same fragmented data download protocol as above, but different type of data this time, looks like short status report of various subsystems with these ASCII names (maybe this is booster stage):cbm crcmgr dwn fbm fbmavs fbmpwr fbmsaf rm scfg smm upl
Again same fragmented download protocol, with different data and more subsystem names (maybe this is the Perseverance):acs btp cmd csm edlcam eha fbm fbmpwr fvs helo l_mcam mca mot moxi pammgr pixl pwr pyro r_mcam reumgr rimfax scam sdst seqctr seqeng smm srlc sspa thrust twta uhft upl vcemgr
Another fragmented download protocol, with just short data and a few ASCII strings:cmd seqeng
Also uses fragmented data protocol. Very short data with ASCII:fbm therma
Again uses fragmented data protocol. Very short data with ASCII:fbmavs seqctr sfp_00002 smc_00003
Fragmented data protocol with binary only data.
Analysis of data and used protocol continues...
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