From kkowalski@stanford.edu Mon Apr 22 10:48:39 1996 Path: ashpoly!cascade!mxgate!coyoacan!stanford!kkowalski From: kkowalski@stanford.edu (Kenji Kowalski) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Apr22.104839.9638@stanford.edu> Date: Mon, 22 Apr 1996 10:48:39 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 10 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. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Kenji Kowalski Tape trading list upon request. SASE required for international mail. From sjohansson@hanse.de Wed Apr 24 09:41:39 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!sjohansson From: sjohansson@hanse.de (Sergei Johansson) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Apr24.094139.3367@hanse.de> Date: Wed, 24 Apr 1996 09:41:39 GMT References: <1996Apr22.104839.9638@stanford.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Apr22.104839.9638@stanford.edu>, kkowalski@stanford.edu (Kenji Kowalski) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Top-posters will be placed in my ~/.killfile without notice. -- Sergei Johansson *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0