From ohughes@cam.ac.uk Sat Jan 28 22:05:34 1995 Path: ashpoly!cascade!brgate!saturno!cam!ohughes From: ohughes@cam.ac.uk (Olga Hughes) Newsgroups: comp.dsp Subject: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan28.220534.4108@cam.ac.uk> Date: Sat, 28 Jan 1995 22:05:34 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 11 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Olga Hughes Practical Peripherals 14.4 @ 19,200 bps "We don't sign stars. We build them." From tfournier@tum.de Sun Jan 29 08:27:34 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!tfournier From: tfournier@tum.de (Tomas Fournier) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan29.082734.9135@tum.de> Date: Sun, 29 Jan 1995 08:27:34 GMT References: <1995Jan28.220534.4108@cam.ac.uk> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Jan28.220534.4108@cam.ac.uk>, ohughes@cam.ac.uk (Olga Hughes) 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. -- Tomas Fournier Tape trading list upon request. SASE required for international mail. From agarcia@uni-hamburg.de Mon Jan 30 13:37:34 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!agarcia From: agarcia@uni-hamburg.de (Anton García) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan30.133734.5313@uni-hamburg.de> Date: Mon, 30 Jan 1995 13:37:34 GMT References: <1995Jan28.220534.4108@cam.ac.uk> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Jan28.220534.4108@cam.ac.uk>, ohughes@cam.ac.uk (Olga 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. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Anton García "5 sigma is a discovery. 7 is a question." Acorn RiscPC 600 / TOS 4.04 From msantos@purdue.edu Wed Feb 01 11:43:34 1995 Path: ashpoly!cascade!transat!ukc!fennimore!purdue!msantos From: msantos@purdue.edu (Mike Santos) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb01.114334.6609@purdue.edu> Date: Wed, 01 Feb 1995 11:43:34 GMT References: <1995Jan28.220534.4108@cam.ac.uk> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jan28.220534.4108@cam.ac.uk>, ohughes@cam.ac.uk (Olga 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! -- Mike Santos SupraFAXModem 28.8 @ 33,600 bps "Measuring a record you own is listening, not piracy." From dokonkwo@kiae.su Fri Feb 03 12:53:34 1995 Path: ashpoly!cascade!mxgate!coyoacan!kiae!dokonkwo From: dokonkwo@kiae.su (Dave Okonkwo) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb03.125334.3317@kiae.su> Date: Fri, 03 Feb 1995 12:53:34 GMT References: <1995Jan28.220534.4108@cam.ac.uk> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Jan28.220534.4108@cam.ac.uk>, ohughes@cam.ac.uk (Olga Hughes) 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. -- Dave Okonkwo Tape trading list upon request. SASE required for international mail.