From tsanchez@pipeline.com Thu Aug 15 16:46:59 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!tsanchez
From: tsanchez@pipeline.com (Tomas Sánchez)
Newsgroups: comp.dsp
Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Aug15.164659.3245@pipeline.com>
Date: Thu, 15 Aug 1996 16:46:59 GMT
Organization: The Pipeline Internet Network
NNTP-Posting-Host: pipeline.com
X-Newsreader: TIN [version 1.2 PL2]
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Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

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

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

-- 
=== Tomas Sánchez ===
Dept of Electrical Engineering, The Pipeline Internet Network
"Hold for relay."

From hkuznetsov@cern.ch Sat Aug 17 05:49:59 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!cern!hkuznetsov
From: hkuznetsov@cern.ch (Hana Kuznetsov)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Aug17.054959.2504@cern.ch>
Date: Sat, 17 Aug 1996 05:49:59 GMT
References: <1996Aug15.164659.3245@pipeline.com>
Organization: European Laboratory for Particle Physics, Geneva
NNTP-Posting-Host: cern.ch
X-Newsreader: TIN [version 1.2 PL2]
Lines: 12

In article <1996Aug15.164659.3245@pipeline.com>, tsanchez@pipeline.com (Tomas Sánchez) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.
> 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.

Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns.

-- 
Hana Kuznetsov | hkuznetsov@cern.ch
PGP Key fingerprint: EB0B 05FA BFDC B8CC
"Keep the channels open."