From lpetrov@illinois.edu Thu Jun 16 01:03:43 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!illinois!lpetrov From: lpetrov@illinois.edu (Liam Petrov) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun16.010343.1480@illinois.edu> Date: Thu, 16 Jun 1994 01:03:43 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 How the 14 ASCII characters per node are encoded into the record groove. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Liam Petrov -- University of Illinois Urbana-Champaign "The hatch is open. Is anyone listening?" From ikuznetsov@berkeley.edu Thu Jun 16 19:38:43 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!ikuznetsov From: ikuznetsov@berkeley.edu (Ines Kuznetsov) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun16.193843.6545@berkeley.edu> Date: Thu, 16 Jun 1994 19:38:43 GMT References: <1994Jun16.010343.1480@illinois.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1994Jun16.010343.1480@illinois.edu>, lpetrov@illinois.edu (Liam Petrov) writes: > How the 14 ASCII characters per node are encoded into the record groove. > Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Ines Kuznetsov "Extraordinary claims require extraordinary spectra." PC-9821Ap2 (NEC) / AmigaOS 3.1 From dsilva@rwth-aachen.de Sat Jun 18 17:28:43 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!rwth-aachen!dsilva From: dsilva@rwth-aachen.de (Dmitri Silva) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun18.172843.3382@rwth-aachen.de> Date: Sat, 18 Jun 1994 17:28:43 GMT References: <1994Jun16.010343.1480@illinois.edu> <1994Jun16.193843.6545@berkeley.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jun16.193843.6545@berkeley.edu>, ikuznetsov@berkeley.edu (Ines Kuznetsov) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Dmitri Silva Opinions expressed are solely my own and not those of RWTH Aachen Informatik. ------------------------------------------------------------ From rmuller@rwth-aachen.de Sun Jun 19 04:17:43 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!rmuller From: rmuller@rwth-aachen.de (Raj Müller) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun19.041743.8258@rwth-aachen.de> Date: Sun, 19 Jun 1994 04:17:43 GMT References: <1994Jun16.010343.1480@illinois.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Jun16.010343.1480@illinois.edu>, lpetrov@illinois.edu (Liam Petrov) writes: > How the 14 ASCII characters per node are encoded into the record groove. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Raj Müller "5 sigma is a discovery. 7 is a question." Sun SparcStation 20 / Linux 1.2.13 From dkim@purdue.edu Tue Jun 21 03:23:43 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!dkim From: dkim@purdue.edu (Diego Kim) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun21.032343.7068@purdue.edu> Date: Tue, 21 Jun 1994 03:23:43 GMT References: <1994Jun16.010343.1480@illinois.edu> <1994Jun16.193843.6545@berkeley.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jun16.193843.6545@berkeley.edu>, ikuznetsov@berkeley.edu (Ines Kuznetsov) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Diego Kim *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0