From kkuznetsov@tum.de Sun Oct 20 10:42:01 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!kkuznetsov From: kkuznetsov@tum.de (Kirsty Kuznetsov) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Oct20.104201.7863@tum.de> Date: Sun, 20 Oct 1996 10:42:01 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. 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. -- Kirsty Kuznetsov SupraFAXModem 28.8 @ ISDN 64k bps "The hatch is open. Is anyone listening?" From dnakamura@utexas.edu Sun Oct 20 22:08:01 1996 Path: ashpoly!cascade!mxgate!coyoacan!utexas!dnakamura From: dnakamura@utexas.edu (Dmitri Nakamura) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Oct20.220801.4587@utexas.edu> Date: Sun, 20 Oct 1996 22:08:01 GMT References: <1996Oct20.104201.7863@tum.de> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1996Oct20.104201.7863@tum.de>, kkuznetsov@tum.de (Kirsty Kuznetsov) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > 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. Top-posters will be placed in my ~/.killfile without notice. -- Dmitri Nakamura Opinions expressed are solely my own and not those of University of Texas at Austin. ------------------------------------------------------------ From glee@kth.se Mon Oct 21 13:02:01 1996 Path: ashpoly!cascade!bigsur!kth!glee From: glee@kth.se (Göran Lee) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Oct21.130201.4564@kth.se> Date: Mon, 21 Oct 1996 13:02:01 GMT References: <1996Oct20.104201.7863@tum.de> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Oct20.104201.7863@tum.de>, kkuznetsov@tum.de (Kirsty Kuznetsov) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Göran Lee "Marcus is not one man." 486DX2/66 (Linux 1.2.13) / System 7.5.1