From mwatanabe@purdue.edu Thu May 04 03:11:23 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!purdue!mwatanabe From: mwatanabe@purdue.edu (Mateo Watanabe) Newsgroups: comp.dsp Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May04.031123.3973@purdue.edu> Date: Thu, 04 May 1995 03:11:23 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 11 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). 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. -- Mateo Watanabe "Extraordinary claims require extraordinary spectra." Atari Falcon 030 / NEXTSTEP 3.3 From lsokolov@cam.ac.uk Fri May 05 17:11:23 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!lsokolov From: lsokolov@cam.ac.uk (Lucia Sokolov) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May05.171123.3615@cam.ac.uk> Date: Fri, 05 May 1995 17:11:23 GMT References: <1995May04.031123.3973@purdue.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1995May04.031123.3973@purdue.edu>, mwatanabe@purdue.edu (Mateo Watanabe) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Lucia Sokolov | lsokolov@cam.ac.uk PGP Key fingerprint: A6B3 9EEF 2F5F 240D "Keep the channels open." From klarsson@uni-hamburg.de Sun May 07 17:00:23 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!klarsson From: klarsson@uni-hamburg.de (Kenji Larsson) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May07.170023.3329@uni-hamburg.de> Date: Sun, 07 May 1995 17:00:23 GMT References: <1995May04.031123.3973@purdue.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May04.031123.3973@purdue.edu>, mwatanabe@purdue.edu (Mateo Watanabe) 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. -- Kenji Larsson "5 sigma is a discovery. 7 is a question." Amiga 1200 (Blizzard 030/50) / TOS 4.04