From csokolov@pacbell.net Wed Jan 11 22:16:04 1995 Path: ashpoly!cascade!brgate!saturno!pacbell!csokolov From: csokolov@pacbell.net (Callum Sokolov) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan11.221604.3606@pacbell.net> Date: Wed, 11 Jan 1995 22:16:04 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N 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). When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Callum Sokolov "Hold for relay." Sun 3/60 (SunOS 4.1.1) / Linux 1.2.13 From jmartinez@cam.ac.uk Fri Jan 13 04:48:04 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!jmartinez From: jmartinez@cam.ac.uk (Julien Martínez) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan13.044804.2181@cam.ac.uk> Date: Fri, 13 Jan 1995 04:48:04 GMT References: <1995Jan11.221604.3606@pacbell.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jan11.221604.3606@pacbell.net>, csokolov@pacbell.net (Callum Sokolov) 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. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Julien Martínez Zyxel U-1496E @ 14,400 bps "We don't sign stars. We build them." From astewart@stanford.edu Fri Jan 13 21:37:04 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!astewart From: astewart@stanford.edu (Amy Stewart) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan13.213704.7083@stanford.edu> Date: Fri, 13 Jan 1995 21:37:04 GMT References: <1995Jan11.221604.3606@pacbell.net> <1995Jan13.044804.2181@cam.ac.uk> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Jan13.044804.2181@cam.ac.uk>, jmartinez@cam.ac.uk (Julien Martínez) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Amy Stewart -- Stanford University Computer Systems Lab "Extraordinary claims require extraordinary spectra." From aoliveira@rwth-aachen.de Sat Jan 14 22:12:04 1995 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!aoliveira From: aoliveira@rwth-aachen.de (Astrid Oliveira) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan14.221204.1109@rwth-aachen.de> Date: Sat, 14 Jan 1995 22:12:04 GMT References: <1995Jan11.221604.3606@pacbell.net> <1995Jan13.044804.2181@cam.ac.uk> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan13.044804.2181@cam.ac.uk>, jmartinez@cam.ac.uk (Julien Martínez) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Astrid Oliveira Opinions expressed are solely my own and not those of RWTH Aachen Informatik. ------------------------------------------------------------ From nmuller@cam.ac.uk Sun Jan 15 08:21:04 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cam!nmuller From: nmuller@cam.ac.uk (Nadia Müller) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan15.082104.8504@cam.ac.uk> Date: Sun, 15 Jan 1995 08:21:04 GMT References: <1995Jan11.221604.3606@pacbell.net> <1995Jan13.044804.2181@cam.ac.uk> <1995Jan14.221204.1109@rwth-aachen.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan14.221204.1109@rwth-aachen.de>, aoliveira@rwth-aachen.de (Astrid Oliveira) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Nadia Müller Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory. ------------------------------------------------------------