From jkarlsson@titech.ac.jp Thu Jun 13 19:23:12 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!titech!jkarlsson
From: jkarlsson@titech.ac.jp (Jens Karlsson)
Newsgroups: comp.dsp
Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Jun13.192312.3349@titech.ac.jp>
Date: Thu, 13 Jun 1996 19:23:12 GMT
Organization: Tokyo Institute of Technology Computer Centre
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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.

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

-- 
Jens Karlsson
Opinions expressed are solely my own and not those of Tokyo Institute of Technology Computer Centre.
------------------------------------------------------------

From rtanaka@uu.net Fri Jun 14 10:07:12 1996
Path: ashpoly!cascade!bigsur!uu!rtanaka
From: rtanaka@uu.net (Renata Tanaka)
Newsgroups: comp.dsp
Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Jun14.100712.5343@uu.net>
Date: Fri, 14 Jun 1996 10:07:12 GMT
References: <1996Jun13.192312.3349@titech.ac.jp>
Organization: UUNET Technologies, Falls Church VA
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In article <1996Jun13.192312.3349@titech.ac.jp>, jkarlsson@titech.ac.jp (Jens Karlsson) writes:
> 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).

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

Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

-- 
Renata Tanaka -- UUNET Technologies, Falls Church VA
"They will send a copy in my place."

From alopez@netcom.com Sat Jun 15 20:31:12 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!netcom!alopez
From: alopez@netcom.com (Anja López)
Newsgroups: comp.dsp
Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Jun15.203112.8947@netcom.com>
Date: Sat, 15 Jun 1996 20:31:12 GMT
References: <1996Jun13.192312.3349@titech.ac.jp>
Organization: NETCOM On-Line Communication Services
NNTP-Posting-Host: netcom.com
X-Newsreader: TIN [version 1.2 PL2]
Lines: 12

In article <1996Jun13.192312.3349@titech.ac.jp>, jkarlsson@titech.ac.jp (Jens Karlsson) writes:
> 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).

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

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

-- 
Anja López | alopez@netcom.com
PGP Key fingerprint: FF53 D3FD 7C8F EC7F
"Keep the channels open."