From htanaka@tum.de Thu Jul 27 21:38:04 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!htanaka From: htanaka@tum.de (Heather Tanaka) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul27.213804.4167@tum.de> Date: Thu, 27 Jul 1995 21:38:04 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] 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. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Heather Tanaka Opinions expressed are solely my own and not those of Technische Universität München. ------------------------------------------------------------ From vgirard@mindspring.com Sun Jul 30 00:13:04 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!vgirard From: vgirard@mindspring.com (Valeria Girard) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul30.001304.2978@mindspring.com> Date: Sun, 30 Jul 1995 00:13:04 GMT References: <1995Jul27.213804.4167@tum.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jul27.213804.4167@tum.de>, htanaka@tum.de (Heather Tanaka) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Valeria Girard *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From mdubois@demon.co.uk Mon Jul 31 19:17:04 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!mdubois From: mdubois@demon.co.uk (Mathieu Dubois) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul31.191704.3080@demon.co.uk> Date: Mon, 31 Jul 1995 19:17:04 GMT References: <1995Jul27.213804.4167@tum.de> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jul27.213804.4167@tum.de>, htanaka@tum.de (Heather Tanaka) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Mathieu Dubois | mdubois@demon.co.uk PGP Key fingerprint: 1660 7D50 CB00 C1EA "Keep the channels open." From lhughes@kiae.su Tue Aug 01 17:20:04 1995 Path: ashpoly!cascade!transat!ukc!fennimore!kiae!lhughes From: lhughes@kiae.su (Lucia Hughes) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug01.172004.5777@kiae.su> Date: Tue, 01 Aug 1995 17:20:04 GMT References: <1995Jul27.213804.4167@tum.de> <1995Jul30.001304.2978@mindspring.com> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Jul30.001304.2978@mindspring.com>, vgirard@mindspring.com (Valeria Girard) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Lucia Hughes SupraFAXModem 28.8 @ 33,600 bps "The carrier frequency does not drift by accident."