Keeping accurate time for a hybrid GPS receiver and mobile...

Details Keeping accurate time for a hybrid GPS receiver and mobile... Keeping accurate time for a hybrid GPS receiver and mobile...

2008-04-22

2008-04-22

Issing, Gregory C (Department: 3662)

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

Directive

Including a satellite

C342S357490

Reexamination Certificate

active

07362263

ABSTRACT:
A hybrid navigation satellite receiver and mobile telephone uses only two crystal oscillators. One that operates a master clock around 27-MHz and that consumes milliwatts of power. The other oscillator consumes only microwatts of power and operates continuously on battery power at about 32-KHz. Only the second, low frequency oscillator is kept running during power “off”. On power “restart”, a real-time-clock counter is consulted to cause an estimate of the GPS system time to be regenerated and supplied to the GPS-DSP to quicken its initialization. The master clock is GPS-calibrated, and the accurate clock is used to drive NCO's for the mobile telephone part and host CPU.

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