From vkowalski@tum.de Fri Jan 19 02:40:43 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!tum!vkowalski From: vkowalski@tum.de (Valeria Kowalski) Newsgroups: comp.dsp Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jan19.024043.7084@tum.de> Date: Fri, 19 Jan 1996 02:40:43 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 10 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. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Valeria Kowalski Tape trading list upon request. SASE required for international mail. From civanov@mindspring.com Fri Jan 19 08:14:43 1996 Path: ashpoly!cascade!bigsur!mindspring!civanov From: civanov@mindspring.com (Callum Ivanov) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jan19.081443.5966@mindspring.com> Date: Fri, 19 Jan 1996 08:14:43 GMT References: <1996Jan19.024043.7084@tum.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1996Jan19.024043.7084@tum.de>, vkowalski@tum.de (Valeria Kowalski) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Callum Ivanov Tape trading list upon request. SASE required for international mail. From bmuller@u-tokyo.ac.jp Fri Jan 19 09:41:43 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!bmuller From: bmuller@u-tokyo.ac.jp (Brian Müller) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jan19.094143.2794@u-tokyo.ac.jp> Date: Fri, 19 Jan 1996 09:41:43 GMT References: <1996Jan19.024043.7084@tum.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Jan19.024043.7084@tum.de>, vkowalski@tum.de (Valeria Kowalski) 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. -- Brian Müller *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From lmoreno@kth.se Sat Jan 20 17:44:43 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!lmoreno From: lmoreno@kth.se (Lars Moreno) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jan20.174443.1001@kth.se> Date: Sat, 20 Jan 1996 17:44:43 GMT References: <1996Jan19.024043.7084@tum.de> <1996Jan19.081443.5966@mindspring.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jan19.081443.5966@mindspring.com>, civanov@mindspring.com (Callum Ivanov) writes: > The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- === Lars Moreno === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "Do not worship the copy."