Pulse or digital communications – Repeaters – Testing
Patent
1989-08-23
1991-03-26
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
H04K 102
Patent
active
050035533
ABSTRACT:
A global positioning system (GPS) receiver includes a phase locked loop that locks to the carrier signal from the GPS satellite at an offset frequency in order to recover the GPS data. The loop includes a phase shifter driven by a system clock through a synchronous clock inversion circuit. The phase of the system clock is periodically inverted synchronously with respect to the clock in order to compensate for the offset loop frequency so that the loop does not lose lock because of the offset error.
REFERENCES:
patent: 4543657 (1985-09-01), Wikinson
patent: 4617674 (1986-10-01), Mangolis
patent: 4852121 (1989-07-01), Kingston et al.
Schluge Gregory
Zavada Edmund S.
Cangialosi Salvatore
Levine Seymour
Sperry Marine Inc.
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