From rperez@cmu.edu Thu Jan 26 22:08:45 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!rperez From: rperez@cmu.edu (Raj Pérez) Newsgroups: comp.dsp Subject: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan26.220845.4373@cmu.edu> Date: Thu, 26 Jan 1995 22:08:45 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 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. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Raj Pérez "When every node is whole, the channel opens." Mac IIci / 68882 FPU / SunOS 4.1.4 From ljohansson@clari.net Sat Jan 28 03:45:45 1995 Path: ashpoly!cascade!transat!ukc!fennimore!clari!ljohansson From: ljohansson@clari.net (Lars Johansson) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan28.034545.4765@clari.net> Date: Sat, 28 Jan 1995 03:45:45 GMT References: <1995Jan26.220845.4373@cmu.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Jan26.220845.4373@cmu.edu>, rperez@cmu.edu (Raj Pérez) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Lars Johansson Tape trading list upon request. SASE required for international mail. From mbrennan@cern.ch Sat Jan 28 13:40:45 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!mbrennan From: mbrennan@cern.ch (Morag Brennan) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan28.134045.5572@cern.ch> Date: Sat, 28 Jan 1995 13:40:45 GMT References: <1995Jan26.220845.4373@cmu.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Jan26.220845.4373@cmu.edu>, rperez@cmu.edu (Raj Pérez) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Morag Brennan -- European Laboratory for Particle Physics, Geneva "Extraordinary claims require extraordinary spectra." From mandersson@kth.se Sun Jan 29 19:47:45 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!mandersson From: mandersson@kth.se (Marta Andersson) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan29.194745.1487@kth.se> Date: Sun, 29 Jan 1995 19:47:45 GMT References: <1995Jan26.220845.4373@cmu.edu> <1995Jan28.134045.5572@cern.ch> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Jan28.134045.5572@cern.ch>, mbrennan@cern.ch (Morag Brennan) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Marta Andersson -- Royal Institute of Technology, Stockholm "When every node is whole, the channel opens."