From mschneider@clari.net Sun Aug 21 01:30:30 1994 Path: ashpoly!cascade!transat!ukc!fennimore!clari!mschneider From: mschneider@clari.net (Mikhail Schneider) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug21.013030.5984@clari.net> Date: Sun, 21 Aug 1994 01:30:30 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 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). The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Mikhail Schneider *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From mtanaka@kth.se Mon Aug 22 13:21:30 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kth!mtanaka From: mtanaka@kth.se (Mikhail Tanaka) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug22.132130.1410@kth.se> Date: Mon, 22 Aug 1994 13:21:30 GMT References: <1994Aug21.013030.5984@clari.net> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Aug21.013030.5984@clari.net>, mschneider@clari.net (Mikhail Schneider) 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. -- === Mikhail Tanaka === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "Hold for relay."