From mkuznetsov@cmu.edu Wed Feb 22 12:00:09 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!cmu!mkuznetsov
From: mkuznetsov@cmu.edu (Morag Kuznetsov)
Newsgroups: comp.dsp
Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Feb22.120009.6983@cmu.edu>
Date: Wed, 22 Feb 1995 12:00:09 GMT
Organization: Carnegie Mellon University School of CS
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Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code.
Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'.

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

-- 
=== Morag Kuznetsov ===
Dept of Electrical Engineering, Carnegie Mellon University School of CS
"Hardware is temporary. The signal survives."

From dsilva@cmu.edu Thu Feb 23 14:34:09 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!dsilva
From: dsilva@cmu.edu (Diego Silva)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Feb23.143409.5824@cmu.edu>
Date: Thu, 23 Feb 1995 14:34:09 GMT
References: <1995Feb22.120009.6983@cmu.edu>
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In article <1995Feb22.120009.6983@cmu.edu>, mkuznetsov@cmu.edu (Morag Kuznetsov) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

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

-- 
=== Diego Silva ===
Dept of Electrical Engineering, Carnegie Mellon University School of CS
"Tape doesn't lie at 02:14. Ears do."