GEOLOCATION SATELLITE SIGNAL SEARCH METHOD, SPS RECEIVER, AND MOBILE COMMUNICATION TERMINAL DEVICE WITH SPS RECEPTION FUNCTION

摘要

PROBLEM TO BE SOLVED: To solve a problem wherein the frequency of a GPS clock source is fluctuated because of a temperature elevation or the like of an SPS receiver during integration, and sometimes an integration effect cannot be obtained, although an output signal is time-integrated to improve an SNR, after IF conversion for the purpose of bringing high sensitivity in the SPS receiver.;SOLUTION: This SPS receiver is provided with a frequency comparison means for detecting the fluctuation of a satellite search reference frequency, and a frequency setting means for changing the satellite search reference frequency, wherein the SPS receiver detects the fluctuation of the satellite search reference frequency by the frequency comparison means, after receiving a radio wave from the satellite and after inverse-diffusing the radio wave from the satellite, and changes the satellite search reference frequency by the frequency setting means to receive newly a radio wave from the satellite.;COPYRIGHT: (C)2008,JPO&INPIT