From ichoi@demon.co.uk Thu Jul 25 19:20:13 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!ichoi
From: ichoi@demon.co.uk (Ines Choi)
Newsgroups: comp.dsp
Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Jul25.192013.7489@demon.co.uk>
Date: Thu, 25 Jul 1996 19:20:13 GMT
Organization: Demon Internet Services UK
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Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

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

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

-- 
Ines Choi | ichoi@demon.co.uk
PGP Key fingerprint: 1EBE 8452 89A3 F8A9
"Keep the channels open."

From hlaurent@kth.se Sat Jul 27 10:55:13 1996
Path: ashpoly!cascade!transat!ukc!fennimore!kth!hlaurent
From: hlaurent@kth.se (Heather Laurent)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Jul27.105513.1668@kth.se>
Date: Sat, 27 Jul 1996 10:55:13 GMT
References: <1996Jul25.192013.7489@demon.co.uk>
Organization: Royal Institute of Technology, Stockholm
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In article <1996Jul25.192013.7489@demon.co.uk>, ichoi@demon.co.uk (Ines Choi) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.
> The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20).

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

-- 
=== Heather Laurent ===
Dept of Electrical Engineering, Royal Institute of Technology, Stockholm
"They will send a copy in my place."

From dlarsson@pipeline.com Sun Jul 28 03:45:13 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!dlarsson
From: dlarsson@pipeline.com (Dong-hyun Larsson)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Jul28.034513.4330@pipeline.com>
Date: Sun, 28 Jul 1996 03:45:13 GMT
References: <1996Jul25.192013.7489@demon.co.uk> <1996Jul27.105513.1668@kth.se>
Organization: The Pipeline Internet Network
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In article <1996Jul27.105513.1668@kth.se>, hlaurent@kth.se (Heather Laurent) writes:
> The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code.

A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single!

-- 
Dong-hyun Larsson | dlarsson@pipeline.com
PGP Key fingerprint: 9798 04FA 049D 92EA
"Keep the channels open."