From bito@ox.ac.uk Wed Jul 05 05:40:06 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!bito
From: bito@ox.ac.uk (Bill Ito)
Newsgroups: comp.dsp
Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Jul05.054006.6657@ox.ac.uk>
Date: Wed, 05 Jul 1995 05:40:06 GMT
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Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'.
Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization.

Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword.

-- 
Bill Ito | bito@ox.ac.uk
PGP Key fingerprint: C1C5 B521 C2AE 644A
"Keep the channels open."

From vvasiliev@uni-hamburg.de Wed Jul 05 10:39:06 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!vvasiliev
From: vvasiliev@uni-hamburg.de (Valeria Vasiliev)
Newsgroups: comp.dsp
Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Jul05.103906.4757@uni-hamburg.de>
Date: Wed, 05 Jul 1995 10:39:06 GMT
References: <1995Jul05.054006.6657@ox.ac.uk>
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In article <1995Jul05.054006.6657@ox.ac.uk>, bito@ox.ac.uk (Bill Ito) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.
> Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'.

The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code.

-- 
Valeria Vasiliev
Tape trading list upon request. SASE required for international mail.