From mmacdonald@utexas.edu Sun Jun 18 19:17:27 1995 Path: ashpoly!cascade!mxgate!coyoacan!utexas!mmacdonald From: mmacdonald@utexas.edu (Mathieu MacDonald) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun18.191727.9454@utexas.edu> Date: Sun, 18 Jun 1995 19:17:27 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu 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). The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Mathieu MacDonald *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From mchoi@illinois.edu Mon Jun 19 03:23:27 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!mchoi From: mchoi@illinois.edu (Marisol Choi) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun19.032327.6710@illinois.edu> Date: Mon, 19 Jun 1995 03:23:27 GMT References: <1995Jun18.191727.9454@utexas.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun18.191727.9454@utexas.edu>, mmacdonald@utexas.edu (Mathieu MacDonald) 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. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Marisol Choi -- University of Illinois Urbana-Champaign "The hatch is open. Is anyone listening?"