Low-power access technique for certain satellite transponders

Details Low-power access technique for certain satellite transponders Low-power access technique for certain satellite transponders

1992-01-16

1995-10-03

Urban, Edward F.

Telecommunications

Carrier wave repeater or relay system

Portable or mobile repeater

455 21, 342353, 342367, H04B 7185

Patent

active

054559600

ABSTRACT:
A satellite communications scheme for enhancing the communications system with existing satellites is disclosed. The existing satellites include a transponder having a phase locked loop phase demodulator at the front end thereof. The present invention discloses a technique wherein the phase demodulator is locked by transmitting a relatively high-power carrier from the ground to the satellite transponder. Once the demodulator has been locked, remote ground terminals operating at much lower power levels can access the satellite transponder by transmitting at carrier frequencies spaced apart from the primary high-power carrier. These are down-converted by the transponder phase demodulator and then typically amplitude and frequency limited before being remodulated and retransmitted.

REFERENCES:
patent: 3546386 (1970-12-01), Darcey
patent: 4748622 (1988-05-01), Muratani et al.
patent: 5033108 (1991-07-01), Lockwood
patent: 5066957 (1991-11-01), Mizuno et al.

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