High accuracy low power GPS time source

Details High accuracy low power GPS time source High accuracy low power GPS time source

1997-09-30

1999-08-17

Tarzca, Thomas

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

Directive

Including a satellite

331 18, 331 66, 331176, 701213, G01S 502, H04B 7185

Patent

active

059400277

ABSTRACT:
A global positioning system (GPS) receiver and high accuracy low power time source (HAL) are disclosed. The HAL provides a time source having an accuracy which is high enough for the receiver to achieve fast direct Y-code acquisition. The HAL includes an oscillator adapted to provide an uncompensated frequency signal at a desired frequency. Frequency conversion circuitry receives the uncompensated frequency signal and a control signal as inputs, and provides as an output a compensated frequency signal having an average compensated frequency which is closer to the desired frequency than is the average uncompensated frequency. A temperature sensor provides an output indicative of a temperature of the oscillator. Frequency error determining circuitry determines an error value, as a function of the temperature sensor output, which is indicative of a quantity of frequency error over time in the uncompensated frequency signal. The frequency error determining circuitry generates the control signal as a function of the determined quantity of frequency error in the uncompensated frequency signal. A counter receives the compensated frequency signal from the frequency conversion circuitry and provides as an output a digital representation of a time period based upon the compensated frequency signal.

REFERENCES:
patent: 4448543 (1984-05-01), Vail
patent: 4513259 (1985-04-01), Frerking
patent: 5379223 (1995-01-01), Asplund
patent: 5459436 (1995-10-01), Pucci et al.
patent: 5515057 (1996-05-01), Lennen et al.
patent: 5629649 (1997-05-01), Ujiie
patent: 5654718 (1997-08-01), Beason et al.

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