From mmuller@kiae.su Sat Jun 17 12:34:31 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kiae!mmuller From: mmuller@kiae.su (Marisol Müller) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun17.123431.1594@kiae.su> Date: Sat, 17 Jun 1995 12:34:31 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 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 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. -- Marisol Müller | mmuller@kiae.su PGP Key fingerprint: 51A2 0540 3735 7856 "Keep the channels open." From nsokolov@purdue.edu Sat Jun 17 21:05:31 1995 Path: ashpoly!cascade!mxgate!coyoacan!purdue!nsokolov From: nsokolov@purdue.edu (Natalia Sokolov) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun17.210531.3355@purdue.edu> Date: Sat, 17 Jun 1995 21:05:31 GMT References: <1995Jun17.123431.1594@kiae.su> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jun17.123431.1594@kiae.su>, mmuller@kiae.su (Marisol Müller) 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! -- Natalia Sokolov US Robotics Courier V.34 @ 14,400 bps "Measuring a record you own is listening, not piracy."