GPS receiver having RF front end power management and...

Details GPS receiver having RF front end power management and... GPS receiver having RF front end power management and...

2007-12-25

2007-12-25

Nguyen, Lee (Department: 2618)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S343100

Reexamination Certificate

active

10952967

ABSTRACT:
A GPS receiver includes baseband resources for simultaneous determination of carrier frequency shift and code chip offset. Reduction in the power consumption of a receiver is achieved by managing the sampling rate of an analog-to-digital converter, the intermediate frequency of the RF front end, and the front end bandwidth so these are appropriate to the current function of the receiver. In a GPS receiver during signal tracking, the IF, front end bandwidth, and ADC sampling rate are set as high as possible; during signal acquisition, the IF and front end bandwidth are set to relatively low values, and the ADC sample rate is set to a high value; and during ephemeris download, the IF, front end bandwidth, and the ADC sample rate are set to relatively low values. When a low battery condition is detected, the IF, front end bandwidth, and the ADC sample rate are set to relatively low values regardless of whether the GPS receiver is in the signal acquisition mode, signal tracking mode, or ephemeris download mode.

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