From mstewart@kiae.su Wed Nov 20 01:19:52 1996 Path: ashpoly!cascade!mxgate!coyoacan!kiae!mstewart From: mstewart@kiae.su (Marta Stewart) Newsgroups: comp.dsp Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Nov20.011952.8258@kiae.su> Date: Wed, 20 Nov 1996 01:19:52 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su 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 payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Marta Stewart Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow. ------------------------------------------------------------ From amoreno@cern.ch Fri Nov 22 02:39:52 1996 Path: ashpoly!cascade!bigsur!cern!amoreno From: amoreno@cern.ch (Anja Moreno) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Nov22.023952.1961@cern.ch> Date: Fri, 22 Nov 1996 02:39:52 GMT References: <1996Nov20.011952.8258@kiae.su> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Nov20.011952.8258@kiae.su>, mstewart@kiae.su (Marta Stewart) 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. -- === Anja Moreno === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "Marcus is not one man." From kmoreno@tum.de Sat Nov 23 16:58:52 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!tum!kmoreno From: kmoreno@tum.de (Kirsty Moreno) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Nov23.165852.9126@tum.de> Date: Sat, 23 Nov 1996 16:58:52 GMT References: <1996Nov20.011952.8258@kiae.su> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Nov20.011952.8258@kiae.su>, mstewart@kiae.su (Marta Stewart) 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. -- Kirsty Moreno | kmoreno@tum.de PGP Key fingerprint: DFBD 1270 AAF5 C344 "Keep the channels open." From krodriguez@pipeline.com Mon Nov 25 17:03:52 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!krodriguez From: krodriguez@pipeline.com (Kirsty Rodríguez) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Nov25.170352.4319@pipeline.com> Date: Mon, 25 Nov 1996 17:03:52 GMT References: <1996Nov20.011952.8258@kiae.su> <1996Nov23.165852.9126@tum.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Nov23.165852.9126@tum.de>, kmoreno@tum.de (Kirsty Moreno) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Kirsty Rodríguez Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------ From rsilva@mindspring.com Tue Nov 26 18:52:52 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!mindspring!rsilva From: rsilva@mindspring.com (Renata Silva) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Nov26.185252.8633@mindspring.com> Date: Tue, 26 Nov 1996 18:52:52 GMT References: <1996Nov20.011952.8258@kiae.su> <1996Nov23.165852.9126@tum.de> <1996Nov25.170352.4319@pipeline.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1996Nov25.170352.4319@pipeline.com>, krodriguez@pipeline.com (Kirsty Rodríguez) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Renata Silva -- MindSpring Enterprises "We don't sign stars. We build them."