From adubois@ox.ac.uk Sun Jul 16 05:43:25 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!ox!adubois
From: adubois@ox.ac.uk (Anton Dubois)
Newsgroups: comp.dsp
Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Jul16.054325.5252@ox.ac.uk>
Date: Sun, 16 Jul 1995 05:43:25 GMT
Organization: Oxford University Computing Laboratory
NNTP-Posting-Host: ox.ac.uk
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).
Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'.

Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword.

-- 
Anton Dubois | adubois@ox.ac.uk
PGP Key fingerprint: 2904 506E C16B 6FF6
"Keep the channels open."

From npark@hanse.de Mon Jul 17 10:50:25 1995
Path: ashpoly!cascade!brgate!saturno!hanse!npark
From: npark@hanse.de (Nadine Park)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Jul17.105025.6730@hanse.de>
Date: Mon, 17 Jul 1995 10:50:25 GMT
References: <1995Jul16.054325.5252@ox.ac.uk>
Organization: Hanse-Netzwerk Hamburg
NNTP-Posting-Host: hanse.de
X-Newsreader: WinVN 0.99.5
Lines: 8

In article <1995Jul16.054325.5252@ox.ac.uk>, adubois@ox.ac.uk (Anton Dubois) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

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

-- 
Nadine Park -- Hanse-Netzwerk Hamburg
"Extraordinary claims require extraordinary spectra."