Apparatus for synchronizing spread spectrum transmissions from s

Details Apparatus for synchronizing spread spectrum transmissions from s Apparatus for synchronizing spread spectrum transmissions from s

1983-03-04

1986-05-06

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375115, 370104, H04K 104

Patent

active

045876614

ABSTRACT:
A low-power, spread spectrum synchronized communication system employing a satellite which continuously and iteratively re-transmits a PRS signal PRS.sub.m from a master earth station having a chip rate C.sub.m and a bit rate B.sub.m and comprising a plurality of ground stations each including a transmitter for transmitting a first PRS signal (PRS.sub.G) unique thereto and having a first chip rate C.sub.G and a first bit rate B.sub.G and a receiver for receiving and identifying PRS.sub.G after being returned by the satellite as PRS.sub.Gr with a chip rate C.sub.Gr and a bit rate B.sub.Gr. Also provided is a phase difference detector responsive to C.sub.m and C.sub.Gr to periodically produce a signal representative of the change of phase difference thereof and a frequency changing circuit responsive to such signal to change the chip rate C.sub.Gr by an amount which will cause the phase of C.sub.Gr to approach the phase of C.sub.m at a given rate.

REFERENCES:
patent: 3858007 (1974-12-01), Ganssmantel
patent: 3982075 (1976-09-01), Jefferis et al.
patent: 3995111 (1976-11-01), Tsuji et al.
patent: 4004225 (1977-01-01), Ganssmantel
patent: 4005266 (1977-01-01), Lehr et al.
patent: 4010420 (1977-03-01), Reiner et al.
patent: 4095226 (1978-06-01), Kratzer
patent: 4117267 (1978-09-01), Haberle et al.
patent: 4270211 (1981-05-01), Schlichte
patent: 4292683 (1981-09-01), Jueneman

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