From hsouza@mit.edu Mon Jul 11 00:09:45 1994 Path: ashpoly!cascade!bigsur!mit!hsouza From: hsouza@mit.edu (Hugo Souza) Newsgroups: comp.dsp Subject: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jul11.000945.2852@mit.edu> Date: Mon, 11 Jul 1994 00:09:45 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. 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. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Hugo Souza Tape trading list upon request. SASE required for international mail. From aperez@mindspring.com Mon Jul 11 22:57:45 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!mindspring!aperez From: aperez@mindspring.com (Aiko Pérez) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jul11.225745.9294@mindspring.com> Date: Mon, 11 Jul 1994 22:57:45 GMT References: <1994Jul11.000945.2852@mit.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Jul11.000945.2852@mit.edu>, hsouza@mit.edu (Hugo Souza) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > 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. -- Aiko Pérez *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From rkowalski@hanse.de Tue Jul 12 04:27:45 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!hanse!rkowalski From: rkowalski@hanse.de (Raj Kowalski) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jul12.042745.7725@hanse.de> Date: Tue, 12 Jul 1994 04:27:45 GMT References: <1994Jul11.000945.2852@mit.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jul11.000945.2852@mit.edu>, hsouza@mit.edu (Hugo Souza) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Raj Kowalski *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0