GPS receiver using data bit timing to achieve a fast time to fir

Details GPS receiver using data bit timing to achieve a fast time to fir GPS receiver using data bit timing to achieve a fast time to fir

1996-07-05

1998-12-29

Tarcza, Thomas H.

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

Directive

Including a satellite

342352, 701213, G01S 502, H04B 7185

Patent

active

058546057

ABSTRACT:
A GPS receiver and a method for improving time to first fix (TTFF). The GPS receiver includes an internal clock for maintaining an approximate clock time during a standby mode and a microprocessor system including a data bit timer code, a temperature compensation code, and a learned time adjustment code. When the GPS receiver enters an operational mode, the data bit timer code instructs the microprocessor system for determining a GPS-based clock time by aligning the approximate clock time according to a time-of-arrival of a GPS data bit when the approximate clock time and the GPS-based clock time are estimated to be within a correction range of ten milliseconds. The temperature compensation code and a learned time adjustment code include instructions for using a stored frequency/temperature characteristic and a learned time correction, respectively, for estimating and compensating for time drift that has occurred during the standby mode. A temperature sensor provides a temperature measurement of a reference oscillator used as a time base for the internal clock.

REFERENCES:
patent: 4423419 (1983-12-01), Johannessen
patent: 5390207 (1995-02-01), Fenton et al.
patent: 5402450 (1995-03-01), Lennen
patent: 5592173 (1997-01-01), Lan et al.
patent: 5594453 (1997-01-01), Rodal et al.
patent: 5629708 (1997-05-01), Rodal et al.

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