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OMID telemetry decoded!

Submitted by pjm on Wed, 04/02/2009 - 21:04.

Following analysis of the 465MHZ downlink from OMID, Iran's home-built satellite, ASCII text has been recovered. The signal is FSK modulated with 600Bd Manchester => 300Bd real data rate. Each frame is 600 bits long, and so far Mission Elapsed Time has been found along with the ASCII message. Thanks go to r00t for analysis and decoding of this telemetry.

Omid's UHF downlink has two modes, mode-1 is a 1KHz 'test signal' and mode-2 is the telemetry. FFT's of each mode can be seen below;

OMID telemetry;

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2915 reads

Demodulated frames

Submitted by r00t on Wed, 25/02/2009 - 22:33.

I have wrote quite sophisticated demodulator for processing recordings even with bad SNR and fading. Currently it still needs fine-tuning for every recording, however if anyone have OMID recording and want to see it decoded, just send me message or come to #hearsat IRC channel.

Frame bytes as follows: 1CD2C0 = sync (looks like I guessed it right) ddhhmmss = OBD time ff = flags [2 blocks of basic telemetry/GPS? len=12] [message multiplex status/format/msgtype? len=5] [message multiplex,len=60] [unknown/voltages? = len=8] (sync is repeated as checked by demodulator here, not sent in actual tlm)

Message multiplex contains: - ASCII message - last 3 frames every minute - unk data #1, can be seen on screenshot, never seen again, probably ground commands echo or some dump, format: 000003 D7 3A 23 000020 D0 3B 23 0000AA D1 00 24 000033 D2 05 26 00000B D3 02 24 0000BB D4 03 24 - 3 frames every minute before test message, fixed pattern (maybe arabic text in some encoding?)
Basic tlm - two blocks in every two second frame = updates 1/sec: FFFFFFFF12AFE2F30000FFFF FFFFFFFF119FE1F20000FFFF FFFFFFFF13ACE1F30000FFFF FFFFFFFF119CE2F30000FFFF FFFFFFFF11A9E1F20000FFFF FFFFFFFF11ABE1F20000FFFF FFFFFFFF11A9E1F20000FFFF FFFFFFFF139DE1F20000FFFF FFFFFFFF12ABE1F20000FFFF FFFFFFFF129D0000E3F4FFFF FFFFFFFF142B0400E2F4FFFF DAB662DB76A99F0EE6F3FFFF 9312FBFF09AD0000E2F3FFFF 5D01F7FF059E0000E2F3FFFF 4700FAFF04B10000E2F5FFFF 3801F8FF039D0000E2F3FFFF 3500F8FF87B00000E2F3FFFF FFFFFFFF10AD0000E3F4FFFF FFFFFFFF10B00000E3F4FFFF FFFFFFFF139B0000E2F3FFFF

Some demodulated frames from OMID:
[ This is from recording used to make screenshot above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

[ Another recording, heavy fading ] 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000C00601CA883E1FF1F00A0FFFF9FDF1FFA 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000600300ED4C1F0FF0F00D0FFFFCFEF0FFD9DDE 1CDEEF4703F0FF3FFFFFFFEFD10000F0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCF1DFECF1F0EDEF0C3FF1F8EFD00000000A00EDCC1F0FF0F0000000000A00ED431F0FF0F00D0FFFFEFBFFFFFFFFF FCFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFBBFE9F1F5CBCE187FF3F1CFB01000000C01D8063E0FF1F0000000000C01D8063E0FF1F0080FFFFBFBFFFFFFFFF 1ED2C003001E27B0FFFFFFFF11BFE3F40000FFFFFFFFFFFF11BFE2F40000FFFF02000002020000000000000000000000000000000000000000000000000000000000000000001F1E00031C1DD2 1CD2C003001E29B0FFFFFFFF16BCE2F30000FFFFFFFFFFFF16BCE3F30000FFFF02000003020E110DE15FFEFFFFFF1400E2F30000FFFF00000000000000000000000000000000211E00031E1DD2 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omid telemetry

Submitted by akbari on Thu, 19/02/2009 - 08:52.

hi dear!
START OF FRAME
. Sync Byte: 0x1d
N Sync Byte: 0x2d
R Sync Byte: 0xc0
. OMID Clock: Deys
. OMID Clock: Hour
. OMID Clock: Minute
6 OMID Clock : Second
) obcI on, 1khzI off, txI on, rxI off, obcII off, 1khzII off, txII off, rxII on
……………………..
To be continued .

Omid Telem

Submitted by pjm on Wed, 25/02/2009 - 23:10.

Hi Akbari, this is very interesting information indeed. I have put all of my recordings of Omid passes including some 10mb 'spectravue' recordings on my server at http://pjm.dyndns.org/omid/ please have a look at them.

The photos of Omid are interesting, some parts look like either small GPS patch antennas, or sun / earth sensors, it would be interesting to know what these are for. If you have any further information on the telemetry frame format, this could be integrated into the demodulator in case the satellite is heard again.

regards,

pjm

Hearsat.org