From mrobertson@unam.mx Sun Feb 06 15:12:17 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!unam!mrobertson
From: mrobertson@unam.mx (Mike Robertson)
Newsgroups: comp.dsp
Subject: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Feb06.151217.8658@unam.mx>
Date: Sun, 06 Feb 1994 15:12:17 GMT
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Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

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

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

-- 
Mike Robertson
Opinions expressed are solely my own and not those of Universidad Nacional Autónoma de México (DGSCA).
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From hkowalski@cmu.edu Tue Feb 08 17:38:17 1994
Path: ashpoly!cascade!transat!ukc!fennimore!cmu!hkowalski
From: hkowalski@cmu.edu (Hugo Kowalski)
Newsgroups: comp.dsp
Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Feb08.173817.4345@cmu.edu>
Date: Tue, 08 Feb 1994 17:38:17 GMT
References: <1994Feb06.151217.8658@unam.mx>
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In article <1994Feb06.151217.8658@unam.mx>, mrobertson@unam.mx (Mike Robertson) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

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

-- 
Hugo Kowalski
Tape trading list upon request. SASE required for international mail.

From rlee@illinois.edu Thu Feb 10 03:52:17 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!illinois!rlee
From: rlee@illinois.edu (Raj Lee)
Newsgroups: comp.dsp
Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Feb10.035217.6806@illinois.edu>
Date: Thu, 10 Feb 1994 03:52:17 GMT
References: <1994Feb06.151217.8658@unam.mx> <1994Feb08.173817.4345@cmu.edu>
Organization: University of Illinois Urbana-Champaign
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In article <1994Feb08.173817.4345@cmu.edu>, hkowalski@cmu.edu (Hugo Kowalski) writes:
> A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single!

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

-- 
Raj Lee | rlee@illinois.edu
PGP Key fingerprint: A3C0 07BE 3EA5 058B
"Keep the channels open."