From bwatanabe@pacbell.net Mon Jun 12 09:43:59 1995 Path: ashpoly!cascade!transat!ukc!fennimore!pacbell!bwatanabe From: bwatanabe@pacbell.net (Bill Watanabe) Newsgroups: comp.dsp Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun12.094359.3690@pacbell.net> Date: Mon, 12 Jun 1995 09:43:59 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 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 payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Bill Watanabe Zyxel U-1496E @ 33,600 bps "They will send a copy in my place." From hcampbell@utexas.edu Tue Jun 13 23:47:59 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!hcampbell From: hcampbell@utexas.edu (Hugo Campbell) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun13.234759.8944@utexas.edu> Date: Tue, 13 Jun 1995 23:47:59 GMT References: <1995Jun12.094359.3690@pacbell.net> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jun12.094359.3690@pacbell.net>, bwatanabe@pacbell.net (Bill Watanabe) writes: > 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 Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Hugo Campbell Tape trading list upon request. SASE required for international mail. From akuznetsov@berkeley.edu Thu Jun 15 03:59:59 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!berkeley!akuznetsov From: akuznetsov@berkeley.edu (Amy Kuznetsov) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun15.035959.7030@berkeley.edu> Date: Thu, 15 Jun 1995 03:59:59 GMT References: <1995Jun12.094359.3690@pacbell.net> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jun12.094359.3690@pacbell.net>, bwatanabe@pacbell.net (Bill Watanabe) 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. -- === Amy Kuznetsov === Dept of Electrical Engineering, UC Berkeley Department of EECS "Hardware is temporary. The signal survives."