Real time clock apparatus for fast acquisition or GPS signals

Details Real time clock apparatus for fast acquisition or GPS signals Real time clock apparatus for fast acquisition or GPS signals

1997-01-21

1999-04-06

Zanelli, Michael

Data processing: vehicles, navigation, and relative location

Navigation

Employing position determining equipment

342357, G01C 2100

Patent

active

058930442

ABSTRACT:
An apparatus for improving the acquisition time of GPS signals includes a GPS receiver (21) and a real-time clock circuit (30). The GPS receiver receives GPS signals including a precise time reference signal for providing a position based upon the location of the GPS receiver. The GPS receiver also includes an internal time base (11) derived from the precise time reference signal. The real-time clock circuit is coupled to the GPS receiver for receiving a first time reference signal from the GPS receiver when the precise time reference signal of the GPS signal is available and for providing a second time reference signal to the GPS receiver when the precise time reference signal of the GPS signal is not available thereby allowing a fast acquisition time of GPS signals when the GPS signals are temporarily interrupted or not yet available.

REFERENCES:
patent: 5319374 (1994-06-01), Desai et al.
patent: 5373531 (1994-12-01), Kawasaki
patent: 5592173 (1997-01-01), Lau et al.
patent: 5594453 (1997-01-01), Rodal et al.
patent: 5654718 (1997-08-01), Beason et al.
patent: 5663735 (1997-09-01), Eshenbach
patent: 5666122 (1997-09-01), Carter

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