GPS receiver devices and compensation methods therefor

Details GPS receiver devices and compensation methods therefor GPS receiver devices and compensation methods therefor

2006-12-12

2006-12-12

Mis, David (Department: 2817)

Oscillators

With device responsive to external physical condition

Temperature or light responsive

C331S158000

Reexamination Certificate

active

07148761

ABSTRACT:
A GPS receiver device comprises a receiver, an oscillator, a memory unit, a temperature sensor, and a processor. The oscillator generates frequency with drift errors occurring at a variety of different temperatures. The memory unit stores coefficients of a plurality of polynomial equations. Each polynomial equation fits a temperature range versus corresponding drift errors. The temperature sensor detects ambient temperature of the receiver. The processor determines which temperature range the ambient temperature belongs to, reads the coefficients of the corresponding polynomial equation from the memory unit according to the determined temperature range, and calculates the drift error of the oscillator at the ambient temperature.

REFERENCES:
patent: 5654718 (1997-08-01), Beason et al.
patent: 6472943 (2002-10-01), Soong et al.
patent: 6509870 (2003-01-01), Matsushita et al.

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