GPS receiver having an initial adjustment for correcting for dri

Details GPS receiver having an initial adjustment for correcting for dri GPS receiver having an initial adjustment for correcting for dri

1996-04-18

1997-05-13

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

342352, G01S 502

Patent

active

056297084

ABSTRACT:
A GPS receiver having a rapid acquisition of a GPS satellite signal when a normal operational mode is entered after a low power standby mode. The GPS receiver includes an RF section for receiving the GPS satellite signal and providing an GPS IF signal, a correlator section for providing a correlation signal for the correlation between the GPS IF signal and an internally generated replica signal, and a microprocessor section for receiving the correlation signal and calculating a geographical location of the GPS receiver. The replica signal is based upon a reference frequency from a reference oscillator and a reference time of arrival (TOA) from a timer. In order to increase acquisition speed, the microprocessor section provides the correlator section with an initial frequency adjustment and an initial TOA adjustment to correct for drift in the reference frequency during the standby mode. The initial adjustments are based upon a learned corrections to the initial adjustments that result in acquisition of the GPS satellite signal after alternating one or more times between the standby mode and the normal mode or from stored temperature relationships and measured temperatures of the reference oscillator.

REFERENCES:
patent: 4899117 (1990-02-01), Vig
patent: 5168473 (1992-12-01), Parra
patent: 5402450 (1995-03-01), Lennen
patent: 5511233 (1996-04-01), Otten
patent: 5528248 (1996-06-01), Steiner et al.

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