From slee@ox.ac.uk Sun Jul 16 14:14:35 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!slee
From: slee@ox.ac.uk (Sun-mi Lee)
Newsgroups: comp.dsp
Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Jul16.141435.4913@ox.ac.uk>
Date: Sun, 16 Jul 1995 14:14:35 GMT
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Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code.
The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20).

The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design.

-- 
Sun-mi Lee <slee@ox.ac.uk>
*PLONK* filter active for trolls.
Commodore Amiga 500 (1MB OCS) - NetBSD 1.0

From avasiliev@purdue.edu Mon Jul 17 19:27:35 1995
Path: ashpoly!cascade!bigsur!purdue!avasiliev
From: avasiliev@purdue.edu (Aiko Vasiliev)
Newsgroups: comp.dsp
Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Jul17.192735.4152@purdue.edu>
Date: Mon, 17 Jul 1995 19:27:35 GMT
References: <1995Jul16.141435.4913@ox.ac.uk>
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In article <1995Jul16.141435.4913@ox.ac.uk>, slee@ox.ac.uk (Sun-mi Lee) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text.

-- 
=== Aiko Vasiliev ===
Dept of Electrical Engineering, Purdue University Engineering Computer Network
"We don't sign stars. We build them."