From hlarsson@panix.com Tue Apr 18 18:45:39 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!panix!hlarsson From: hlarsson@panix.com (Hana Larsson) Newsgroups: comp.dsp Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Apr18.184539.3084@panix.com> Date: Tue, 18 Apr 1995 18:45:39 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] 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. 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. -- Hana Larsson Tape trading list upon request. SASE required for international mail. From flee@netcom.com Thu Apr 20 06:56:39 1995 Path: ashpoly!cascade!bigsur!netcom!flee From: flee@netcom.com (Freya Lee) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Apr20.065639.3339@netcom.com> Date: Thu, 20 Apr 1995 06:56:39 GMT References: <1995Apr18.184539.3084@panix.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Apr18.184539.3084@panix.com>, hlarsson@panix.com (Hana Larsson) 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. -- Freya Lee *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0