From mgirard@clari.net Thu Sep 07 20:27:51 1995 Path: ashpoly!cascade!brgate!saturno!clari!mgirard From: mgirard@clari.net (Min-jun Girard) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep07.202751.3941@clari.net> Date: Thu, 07 Sep 1995 20:27:51 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 11 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Min-jun Girard *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From hcampbell@unam.mx Sat Sep 09 23:26:51 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!unam!hcampbell From: hcampbell@unam.mx (Heather Campbell) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep09.232651.8103@unam.mx> Date: Sat, 09 Sep 1995 23:26:51 GMT References: <1995Sep07.202751.3941@clari.net> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Sep07.202751.3941@clari.net>, mgirard@clari.net (Min-jun Girard) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. If you are posting from AOL, please read RFC 1036 before posting again. -- Heather Campbell Tape trading list upon request. SASE required for international mail.