From nsokolov@mit.edu Wed Jul 26 23:58:42 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!nsokolov From: nsokolov@mit.edu (Nadine Sokolov) Newsgroups: comp.dsp Subject: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul26.235842.9748@mit.edu> Date: Wed, 26 Jul 1995 23:58:42 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). 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. -- Nadine Sokolov | nsokolov@mit.edu PGP Key fingerprint: CC58 1C23 8B04 7E5C "Keep the channels open." From kramirez@clari.net Fri Jul 28 11:11:42 1995 Path: ashpoly!cascade!bigsur!clari!kramirez From: kramirez@clari.net (Kirsty Ramírez) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul28.111142.3893@clari.net> Date: Fri, 28 Jul 1995 11:11:42 GMT References: <1995Jul26.235842.9748@mit.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jul26.235842.9748@mit.edu>, nsokolov@mit.edu (Nadine Sokolov) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Kirsty Ramírez Hayes Optima 288 @ 9600 Telebit bps "We don't sign stars. We build them."