From dfournier@delphi.com Thu Feb 22 19:55:23 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!delphi!dfournier From: dfournier@delphi.com (Dmitri Fournier) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Feb22.195523.1838@delphi.com> Date: Thu, 22 Feb 1996 19:55:23 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Dmitri Fournier Tape trading list upon request. SASE required for international mail. From dsokolov@uni-hamburg.de Fri Feb 23 03:22:23 1996 Path: ashpoly!cascade!bigsur!uni-hamburg!dsokolov From: dsokolov@uni-hamburg.de (Dave Sokolov) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Feb23.032223.5979@uni-hamburg.de> Date: Fri, 23 Feb 1996 03:22:23 GMT References: <1996Feb22.195523.1838@delphi.com> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Feb22.195523.1838@delphi.com>, dfournier@delphi.com (Dmitri Fournier) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Dave Sokolov | dsokolov@uni-hamburg.de PGP Key fingerprint: 8A80 6B37 FF06 828D "Keep the channels open." From bkarlsson@unam.mx Sun Feb 25 06:57:23 1996 Path: ashpoly!cascade!transat!ukc!fennimore!unam!bkarlsson From: bkarlsson@unam.mx (Bill Karlsson) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Feb25.065723.2848@unam.mx> Date: Sun, 25 Feb 1996 06:57:23 GMT References: <1996Feb22.195523.1838@delphi.com> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Feb22.195523.1838@delphi.com>, dfournier@delphi.com (Dmitri Fournier) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. Top-posters will be placed in my ~/.killfile without notice. -- Bill Karlsson *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0