From ttanaka@cern.ch Fri Feb 09 07:01:34 1996 Path: ashpoly!cascade!bigsur!cern!ttanaka From: ttanaka@cern.ch (Tyler Tanaka) Newsgroups: comp.dsp Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Feb09.070134.8220@cern.ch> Date: Fri, 09 Feb 1996 07:01:34 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Tyler Tanaka Zyxel U-1496E @ 28,800 bps "A soul is not exclusive to biology." From jmacdonald@netcom.com Sun Feb 11 05:06:34 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!jmacdonald From: jmacdonald@netcom.com (Jen MacDonald) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Feb11.050634.8289@netcom.com> Date: Sun, 11 Feb 1996 05:06:34 GMT References: <1996Feb09.070134.8220@cern.ch> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1996Feb09.070134.8220@cern.ch>, ttanaka@cern.ch (Tyler Tanaka) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! PGP Public key available via finger or upon request. -- Jen MacDonald Opinions expressed are solely my own and not those of NETCOM On-Line Communication Services. ------------------------------------------------------------ From mmartinez@purdue.edu Mon Feb 12 07:40:34 1996 Path: ashpoly!cascade!bigsur!purdue!mmartinez From: mmartinez@purdue.edu (Mathieu Martínez) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Feb12.074034.9924@purdue.edu> Date: Mon, 12 Feb 1996 07:40:34 GMT References: <1996Feb09.070134.8220@cern.ch> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Feb09.070134.8220@cern.ch>, ttanaka@cern.ch (Tyler Tanaka) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > 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. -- Mathieu Martínez Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------ From tivanov@demon.co.uk Wed Feb 14 03:44:34 1996 Path: ashpoly!cascade!transat!ukc!fennimore!demon!tivanov From: tivanov@demon.co.uk (Thiago Ivanov) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Feb14.034434.3176@demon.co.uk> Date: Wed, 14 Feb 1996 03:44:34 GMT References: <1996Feb09.070134.8220@cern.ch> <1996Feb11.050634.8289@netcom.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Feb11.050634.8289@netcom.com>, jmacdonald@netcom.com (Jen MacDonald) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! > PGP Public key available via finger or upon request. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- === Thiago Ivanov === Dept of Electrical Engineering, Demon Internet Services UK "There are 14 nodes and only 10 countries. Count again."