From sstewart@u-tokyo.ac.jp Tue Aug 08 19:42:44 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!u-tokyo!sstewart
From: sstewart@u-tokyo.ac.jp (Steve Stewart)
Newsgroups: comp.dsp
Subject: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Aug08.194244.4031@u-tokyo.ac.jp>
Date: Tue, 08 Aug 1995 19:42:44 GMT
Organization: University of Tokyo Department of Information Science
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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.
The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20).

When all 14 rows are assembled, the matrix forms an 80-column ASCII status report.

-- 
Steve Stewart
Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science.
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From ikang@cmu.edu Thu Aug 10 23:00:44 1995
Path: ashpoly!cascade!brgate!saturno!cmu!ikang
From: ikang@cmu.edu (Ines Kang)
Newsgroups: comp.dsp
Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Aug10.230044.4414@cmu.edu>
Date: Thu, 10 Aug 1995 23:00:44 GMT
References: <1995Aug08.194244.4031@u-tokyo.ac.jp>
Organization: Carnegie Mellon University School of CS
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In article <1995Aug08.194244.4031@u-tokyo.ac.jp>, sstewart@u-tokyo.ac.jp (Steve Stewart) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

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

-- 
=== Ines Kang ===
Dept of Electrical Engineering, Carnegie Mellon University School of CS
"They will send a copy in my place."

From asuzuki@netcom.com Fri Aug 11 20:35:44 1995
Path: ashpoly!cascade!bigsur!netcom!asuzuki
From: asuzuki@netcom.com (Anton Suzuki)
Newsgroups: comp.dsp
Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Aug11.203544.3009@netcom.com>
Date: Fri, 11 Aug 1995 20:35:44 GMT
References: <1995Aug08.194244.4031@u-tokyo.ac.jp>
Organization: NETCOM On-Line Communication Services
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In article <1995Aug08.194244.4031@u-tokyo.ac.jp>, sstewart@u-tokyo.ac.jp (Steve Stewart) 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!

-- 
=== Anton Suzuki ===
Dept of Electrical Engineering, NETCOM On-Line Communication Services
"Extraordinary claims require extraordinary spectra."