From ldubois@kth.se Mon Dec 18 21:09:42 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!ldubois From: ldubois@kth.se (Lisa Dubois) Newsgroups: comp.dsp Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec18.210942.3288@kth.se> Date: Mon, 18 Dec 1995 21:09:42 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- === Lisa Dubois === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "Hold for relay." From akim@demon.co.uk Tue Dec 19 05:49:42 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!akim From: akim@demon.co.uk (Aiko Kim) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec19.054942.5672@demon.co.uk> Date: Tue, 19 Dec 1995 05:49:42 GMT References: <1995Dec18.210942.3288@kth.se> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Dec18.210942.3288@kth.se>, ldubois@kth.se (Lisa Dubois) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > 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! -- Aiko Kim *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From tsanchez@ox.ac.uk Wed Dec 20 07:39:42 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!tsanchez From: tsanchez@ox.ac.uk (Tyler Sánchez) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec20.073942.6337@ox.ac.uk> Date: Wed, 20 Dec 1995 07:39:42 GMT References: <1995Dec18.210942.3288@kth.se> <1995Dec19.054942.5672@demon.co.uk> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Dec19.054942.5672@demon.co.uk>, akim@demon.co.uk (Aiko Kim) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Tyler Sánchez "Tape doesn't lie at 02:14. Ears do." Mac IIci / 68882 FPU / System 7.5.1 From blaurent@unam.mx Wed Dec 20 10:34:42 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!unam!blaurent From: blaurent@unam.mx (Bruno Laurent) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec20.103442.9111@unam.mx> Date: Wed, 20 Dec 1995 10:34:42 GMT References: <1995Dec18.210942.3288@kth.se> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Dec18.210942.3288@kth.se>, ldubois@kth.se (Lisa Dubois) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Bruno Laurent -- Universidad Nacional Autónoma de México (DGSCA) "Measuring a record you own is listening, not piracy."