Alias sampling for IF-to-baseband conversion in a GPS receiver

Details Alias sampling for IF-to-baseband conversion in a GPS receiver Alias sampling for IF-to-baseband conversion in a GPS receiver

2006-08-29

2006-08-29

Ha, Dac (Department: 2611)

Pulse or digital communications

Receivers

C455S323000, C455S333000

Reexamination Certificate

active

07099406

ABSTRACT:
The present invention provides a GPS receiver comprising sampling circuitry adapted to perform IF-to-baseband conversion. In general, the GPS receiver includes downconversion circuitry that uses a first synthesizer output signal to reduce an amplified GPS input signal to an intermediate frequency signal, and sampling circuitry that receives the intermediate frequency signal and produces a baseband digital representation of the amplified GPS input signal. The sampling circuitry performs IF-to-baseband conversion by using a sampling rate equal to the frequency of a second synthesizer output signal, where the sampling rate is selected such that only an alias of the IF signal having the appropriate baseband frequency is digitized.

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Starzyk, J.A. and Zhu, Z., “Averaging Correlation for C/A Code Acquisition and Tracking in Frequency Domain,” Proceedings of the 44thIEEE 2001 Midwest Symposium on Circuits and Systems, vol. 2, pp. 905-908, Dayton, Ohio, Aug. 14-17, 2001.

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