From rhughes@mit.edu Mon Mar 06 07:29:33 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!mit!rhughes From: rhughes@mit.edu (Renata Hughes) Newsgroups: comp.dsp Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar06.072933.1847@mit.edu> Date: Mon, 06 Mar 1995 07:29:33 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 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 symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Renata Hughes | rhughes@mit.edu PGP Key fingerprint: DFB4 15F8 6E55 7206 "Keep the channels open." From mwatanabe@clari.net Tue Mar 07 08:24:33 1995 Path: ashpoly!cascade!bigsur!clari!mwatanabe From: mwatanabe@clari.net (Mateo Watanabe) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar07.082433.3569@clari.net> Date: Tue, 07 Mar 1995 08:24:33 GMT References: <1995Mar06.072933.1847@mit.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Mar06.072933.1847@mit.edu>, rhughes@mit.edu (Renata Hughes) 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 song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Mateo Watanabe Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From jschneider@delphi.com Tue Mar 07 09:51:33 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!delphi!jschneider From: jschneider@delphi.com (Joachim Schneider) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar07.095133.7956@delphi.com> Date: Tue, 07 Mar 1995 09:51:33 GMT References: <1995Mar06.072933.1847@mit.edu> <1995Mar07.082433.3569@clari.net> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Mar07.082433.3569@clari.net>, mwatanabe@clari.net (Mateo Watanabe) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Joachim Schneider "There are 14 nodes and only 10 countries. Count again." PC-9821Ap2 (NEC) / SunOS 4.1.4 From mmacdonald@berkeley.edu Thu Mar 09 07:57:33 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!berkeley!mmacdonald From: mmacdonald@berkeley.edu (Mikhail MacDonald) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar09.075733.2204@berkeley.edu> Date: Thu, 09 Mar 1995 07:57:33 GMT References: <1995Mar06.072933.1847@mit.edu> <1995Mar07.082433.3569@clari.net> <1995Mar07.095133.7956@delphi.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Mar07.095133.7956@delphi.com>, jschneider@delphi.com (Joachim Schneider) writes: > The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Mikhail MacDonald Tape trading list upon request. SASE required for international mail.