Pulse or digital communications – Systems using alternating or pulsating current – Antinoise or distortion
Patent
1997-02-28
1999-03-30
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Antinoise or distortion
375259, 375351, 375377, 342358, 455 32, 455 673, 455 63, 455223, 455283, H04B 110, H04B 1500, H04B 7185
Patent
active
058898212
ABSTRACT:
A method and apparatus to enable high-quality digital transmissions to a satellite terminal operating in proximity to a radar source combines interleaving a sequence of channel symbols at a land station before transmission of an RF signal to a satellite, increasing the satellite's EIRP to compensate for the effects of the radar's duty factor on received signal power and code distance, detecting the radar pulses at a satellite terminal, blanking the received RF signal to prevent reception of the signal by the modem at the satellite terminal during the radar's ON time, having the modem recognize and eliminate the effect of the gap in the channel signals on its metric calculation, and de-interleaving the sequence of channel symbols. As a result, satellite terminals operating in proximity to radar sources can provide the same quality of service as if there were no radars operating.
REFERENCES:
patent: 4119964 (1978-10-01), Johannsen et al.
patent: 4704736 (1987-11-01), Kasser
patent: 4856084 (1989-08-01), Richards, Jr.
patent: 4965854 (1990-10-01), Glazebrook
patent: 5170489 (1992-12-01), Glazebrook
Arnstein Donald S.
Assal Francois
Lieberman Moshe
Upshur John I.
Chin Stephen
Comsat Corporation
Deppe Betsy L.
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