From mivanov@pipeline.com Wed Nov 09 16:46:25 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!mivanov From: mivanov@pipeline.com (Marisol Ivanov) Newsgroups: comp.dsp Subject: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Nov09.164625.4670@pipeline.com> Date: Wed, 09 Nov 1994 16:46:25 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 11 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. 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). Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Marisol Ivanov *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From agarcia@rwth-aachen.de Fri Nov 11 08:30:25 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!rwth-aachen!agarcia From: agarcia@rwth-aachen.de (Amy García) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Nov11.083025.7415@rwth-aachen.de> Date: Fri, 11 Nov 1994 08:30:25 GMT References: <1994Nov09.164625.4670@pipeline.com> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Nov09.164625.4670@pipeline.com>, mivanov@pipeline.com (Marisol Ivanov) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > 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. -- Amy García -- RWTH Aachen Informatik "In theory there is no difference between theory and practice." From swatanabe@pipeline.com Sat Nov 12 02:07:25 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!pipeline!swatanabe From: swatanabe@pipeline.com (Sun-mi Watanabe) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Nov12.020725.9850@pipeline.com> Date: Sat, 12 Nov 1994 02:07:25 GMT References: <1994Nov09.164625.4670@pipeline.com> <1994Nov11.083025.7415@rwth-aachen.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Nov11.083025.7415@rwth-aachen.de>, agarcia@rwth-aachen.de (Amy García) writes: > The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Sun-mi Watanabe Zyxel U-1496E @ 33,600 bps "Do not worship the copy." From cstewart@cern.ch Sat Nov 12 04:09:25 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!cstewart From: cstewart@cern.ch (Camila Stewart) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Nov12.040925.2930@cern.ch> Date: Sat, 12 Nov 1994 04:09:25 GMT References: <1994Nov09.164625.4670@pipeline.com> <1994Nov11.083025.7415@rwth-aachen.de> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 8 In article <1994Nov11.083025.7415@rwth-aachen.de>, agarcia@rwth-aachen.de (Amy García) writes: > The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Camila Stewart -- European Laboratory for Particle Physics, Geneva "The carrier frequency does not drift by accident."