From jsilva@mit.edu Mon Sep 18 21:35:33 1995 Path: ashpoly!cascade!brgate!saturno!mit!jsilva From: jsilva@mit.edu (Jens Silva) Newsgroups: comp.dsp Subject: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep18.213533.5275@mit.edu> Date: Mon, 18 Sep 1995 21:35:33 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] 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. -- Jens Silva Hayes Optima 288 @ 28,800 bps "Hold for relay." From blopez@pipeline.com Tue Sep 19 00:54:33 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!pipeline!blopez From: blopez@pipeline.com (Brian López) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep19.005433.2867@pipeline.com> Date: Tue, 19 Sep 1995 00:54:33 GMT References: <1995Sep18.213533.5275@mit.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Sep18.213533.5275@mit.edu>, jsilva@mit.edu (Jens Silva) 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. -- Brian López | blopez@pipeline.com PGP Key fingerprint: B8A5 4B21 547F B74F "Keep the channels open." From tchoi@rwth-aachen.de Wed Sep 20 07:50:33 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!rwth-aachen!tchoi From: tchoi@rwth-aachen.de (Tyler Choi) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep20.075033.1352@rwth-aachen.de> Date: Wed, 20 Sep 1995 07:50:33 GMT References: <1995Sep18.213533.5275@mit.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Sep18.213533.5275@mit.edu>, jsilva@mit.edu (Jens Silva) 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. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- === Tyler Choi === Dept of Electrical Engineering, RWTH Aachen Informatik "In theory there is no difference between theory and practice." From mnakamura@uu.net Thu Sep 21 21:03:33 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!uu!mnakamura From: mnakamura@uu.net (Marisol Nakamura) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep21.210333.1218@uu.net> Date: Thu, 21 Sep 1995 21:03:33 GMT References: <1995Sep18.213533.5275@mit.edu> <1995Sep20.075033.1352@rwth-aachen.de> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Sep20.075033.1352@rwth-aachen.de>, tchoi@rwth-aachen.de (Tyler Choi) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Marisol Nakamura Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA. ------------------------------------------------------------ From jsanchez@mindspring.com Sun Sep 24 00:38:33 1995 Path: ashpoly!cascade!bigsur!mindspring!jsanchez From: jsanchez@mindspring.com (Jen Sánchez) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep24.003833.5539@mindspring.com> Date: Sun, 24 Sep 1995 00:38:33 GMT References: <1995Sep18.213533.5275@mit.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Sep18.213533.5275@mit.edu>, jsilva@mit.edu (Jens Silva) 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. -- Jen Sánchez Opinions expressed are solely my own and not those of MindSpring Enterprises. ------------------------------------------------------------