From moliveira@cmu.edu Thu Oct 26 01:10:57 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!moliveira From: moliveira@cmu.edu (Mathieu Oliveira) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct26.011057.2386@cmu.edu> Date: Thu, 26 Oct 1995 01:10:57 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 11 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Mathieu Oliveira "Hardware is temporary. The signal survives." Amiga 1200 (Blizzard 030/50) / System 7.5.1 From nlarsson@rwth-aachen.de Sat Oct 28 04:48:57 1995 Path: ashpoly!cascade!bigsur!rwth-aachen!nlarsson From: nlarsson@rwth-aachen.de (Natalia Larsson) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct28.044857.9940@rwth-aachen.de> Date: Sat, 28 Oct 1995 04:48:57 GMT References: <1995Oct26.011057.2386@cmu.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Oct26.011057.2386@cmu.edu>, moliveira@cmu.edu (Mathieu Oliveira) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- === Natalia Larsson === Dept of Electrical Engineering, RWTH Aachen Informatik "We don't sign stars. We build them." From avasiliev@mindspring.com Sun Oct 29 14:26:57 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!avasiliev From: avasiliev@mindspring.com (Amy Vasiliev) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct29.142657.8896@mindspring.com> Date: Sun, 29 Oct 1995 14:26:57 GMT References: <1995Oct26.011057.2386@cmu.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Oct26.011057.2386@cmu.edu>, moliveira@cmu.edu (Mathieu Oliveira) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Amy Vasiliev *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From jperez@hanse.de Mon Oct 30 17:55:57 1995 Path: ashpoly!cascade!transat!ukc!fennimore!hanse!jperez From: jperez@hanse.de (Julien Pérez) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct30.175557.2357@hanse.de> Date: Mon, 30 Oct 1995 17:55:57 GMT References: <1995Oct26.011057.2386@cmu.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Oct26.011057.2386@cmu.edu>, moliveira@cmu.edu (Mathieu Oliveira) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Julien Pérez -- Hanse-Netzwerk Hamburg "We don't sign stars. We build them."