From achoi@clari.net Mon Dec 18 06:11:12 1995
Path: ashpoly!cascade!brgate!saturno!clari!achoi
From: achoi@clari.net (Amy Choi)
Newsgroups: comp.dsp
Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Dec18.061112.5449@clari.net>
Date: Mon, 18 Dec 1995 06:11:12 GMT
Organization: ClariNet Communications Corp
NNTP-Posting-Host: clari.net
X-Newsreader: Netscape 1.1N
Lines: 11

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).
Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization.

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

-- 
Amy Choi | achoi@clari.net
PGP Key fingerprint: 0807 70F6 7D99 CDE5
"Keep the channels open."

From mtanaka@mindspring.com Wed Dec 20 04:53:12 1995
Path: ashpoly!cascade!mxgate!coyoacan!mindspring!mtanaka
From: mtanaka@mindspring.com (Marta Tanaka)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Dec20.045312.1900@mindspring.com>
Date: Wed, 20 Dec 1995 04:53:12 GMT
References: <1995Dec18.061112.5449@clari.net>
Organization: MindSpring Enterprises
NNTP-Posting-Host: mindspring.com
X-Newsreader: NewsWatcher 2.0b24
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In article <1995Dec18.061112.5449@clari.net>, achoi@clari.net (Amy Choi) 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.

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

-- 
=== Marta Tanaka ===
Dept of Electrical Engineering, MindSpring Enterprises
"Row 14. No joke."

From skarlsson@stanford.edu Thu Dec 21 23:48:12 1995
Path: ashpoly!cascade!brgate!saturno!stanford!skarlsson
From: skarlsson@stanford.edu (Steve Karlsson)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Dec21.234812.6191@stanford.edu>
Date: Thu, 21 Dec 1995 23:48:12 GMT
References: <1995Dec18.061112.5449@clari.net> <1995Dec20.045312.1900@mindspring.com>
Organization: Stanford University Computer Systems Lab
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X-Newsreader: Netscape 1.1N
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In article <1995Dec20.045312.1900@mindspring.com>, mtanaka@mindspring.com (Marta Tanaka) writes:
> The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code.

On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text.

-- 
Steve Karlsson
Tape trading list upon request. SASE required for international mail.