From smoreno@uni-hamburg.de Thu Jun 08 14:01:53 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!smoreno
From: smoreno@uni-hamburg.de (Sun-mi Moreno)
Newsgroups: comp.dsp
Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Jun08.140153.1473@uni-hamburg.de>
Date: Thu, 08 Jun 1995 14:01:53 GMT
Organization: Universität Hamburg Fachbereich Informatik
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Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization.
The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20).

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

-- 
Sun-mi Moreno | smoreno@uni-hamburg.de
PGP Key fingerprint: 35C1 9A32 3F15 BE55
"Keep the channels open."

From brodriguez@kth.se Thu Jun 08 18:58:53 1995
Path: ashpoly!cascade!brgate!saturno!kth!brodriguez
From: brodriguez@kth.se (Bill Rodríguez)
Newsgroups: comp.dsp
Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Jun08.185853.9531@kth.se>
Date: Thu, 08 Jun 1995 18:58:53 GMT
References: <1995Jun08.140153.1473@uni-hamburg.de>
Organization: Royal Institute of Technology, Stockholm
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In article <1995Jun08.140153.1473@uni-hamburg.de>, smoreno@uni-hamburg.de (Sun-mi Moreno) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

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

-- 
Bill Rodríguez <brodriguez@kth.se>
SupraFAXModem 28.8 @ 14,400 bps
"Row 14. No joke."