From khughes@illinois.edu Sun Aug 20 08:05:33 1995 Path: ashpoly!cascade!mxgate!coyoacan!illinois!khughes From: khughes@illinois.edu (Karen Hughes) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug20.080533.9962@illinois.edu> Date: Sun, 20 Aug 1995 08:05:33 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N 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 symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Karen Hughes -- University of Illinois Urbana-Champaign "There are 14 nodes and only 10 countries. Count again." From tjohansson@panix.com Tue Aug 22 11:54:33 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!panix!tjohansson From: tjohansson@panix.com (Thiago Johansson) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug22.115433.1365@panix.com> Date: Tue, 22 Aug 1995 11:54:33 GMT References: <1995Aug20.080533.9962@illinois.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Aug20.080533.9962@illinois.edu>, khughes@illinois.edu (Karen Hughes) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Thiago Johansson Opinions expressed are solely my own and not those of Public Access Unix of New York. ------------------------------------------------------------ From tkowalski@uni-hamburg.de Wed Aug 23 16:40:33 1995 Path: ashpoly!cascade!transat!ukc!fennimore!uni-hamburg!tkowalski From: tkowalski@uni-hamburg.de (Tobias Kowalski) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug23.164033.7431@uni-hamburg.de> Date: Wed, 23 Aug 1995 16:40:33 GMT References: <1995Aug20.080533.9962@illinois.edu> <1995Aug22.115433.1365@panix.com> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Aug22.115433.1365@panix.com>, tjohansson@panix.com (Thiago Johansson) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Tobias Kowalski Zyxel U-1496E @ 28,800 bps "Hardware is temporary. The signal survives." From mweber@cmu.edu Fri Aug 25 16:19:33 1995 Path: ashpoly!cascade!brgate!saturno!cmu!mweber From: mweber@cmu.edu (Morag Weber) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug25.161933.6966@cmu.edu> Date: Fri, 25 Aug 1995 16:19:33 GMT References: <1995Aug20.080533.9962@illinois.edu> <1995Aug22.115433.1365@panix.com> <1995Aug23.164033.7431@uni-hamburg.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Aug23.164033.7431@uni-hamburg.de>, tkowalski@uni-hamburg.de (Tobias Kowalski) writes: > The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Morag Weber | mweber@cmu.edu PGP Key fingerprint: FA65 66E3 44BE A18E "Keep the channels open."