From vgonzalez@mit.edu Sat Jul 13 09:51:20 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!mit!vgonzalez
From: vgonzalez@mit.edu (Valeria González)
Newsgroups: comp.dsp
Subject: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Jul13.095120.2243@mit.edu>
Date: Sat, 13 Jul 1996 09:51:20 GMT
Organization: Massachusetts Institute of Technology
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Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

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'.

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

-- 
=== Valeria González ===
Dept of Electrical Engineering, Massachusetts Institute of Technology
"They will send a copy in my place."

From jtakahashi@kth.se Mon Jul 15 09:48:20 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!jtakahashi
From: jtakahashi@kth.se (Julien Takahashi)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Jul15.094820.1470@kth.se>
Date: Mon, 15 Jul 1996 09:48:20 GMT
References: <1996Jul13.095120.2243@mit.edu>
Organization: Royal Institute of Technology, Stockholm
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In article <1996Jul13.095120.2243@mit.edu>, vgonzalez@mit.edu (Valeria González) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.
> The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20).

The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code.

-- 
Julien Takahashi | jtakahashi@kth.se
PGP Key fingerprint: 20B5 E9FE 9C47 7948
"Keep the channels open."