From asmirnov@inria.fr Tue Oct 11 03:04:41 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!asmirnov From: asmirnov@inria.fr (Anja Smirnov) Newsgroups: comp.dsp Subject: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Oct11.030441.1923@inria.fr> Date: Tue, 11 Oct 1994 03:04:41 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. 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. -- Anja Smirnov "Row 14. No joke." Sun 3/60 (SunOS 4.1.1) / NEXTSTEP 3.3 From moliveira@ox.ac.uk Wed Oct 12 23:19:41 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!moliveira From: moliveira@ox.ac.uk (Mike Oliveira) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Oct12.231941.2668@ox.ac.uk> Date: Wed, 12 Oct 1994 23:19:41 GMT References: <1994Oct11.030441.1923@inria.fr> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Oct11.030441.1923@inria.fr>, asmirnov@inria.fr (Anja Smirnov) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Mike Oliveira Opinions expressed are solely my own and not those of Oxford University Computing Laboratory. ------------------------------------------------------------ From lgarcia@pipeline.com Sat Oct 15 00:19:41 1994 Path: ashpoly!cascade!brgate!saturno!pipeline!lgarcia From: lgarcia@pipeline.com (Lisa García) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Oct15.001941.2614@pipeline.com> Date: Sat, 15 Oct 1994 00:19:41 GMT References: <1994Oct11.030441.1923@inria.fr> <1994Oct12.231941.2668@ox.ac.uk> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Oct12.231941.2668@ox.ac.uk>, moliveira@ox.ac.uk (Mike Oliveira) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Lisa García Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------