Patent ID: 7579983

Claim:
A terminal apparatus comprising: a communication apparatus that communicates with a communication base station using a communication signal at a predetermined frequency; and a GPS apparatus, wherein the communication apparatus includes a first oscillator that generates a constant reference signal used to receive the communication signal at the predetermined frequency, an RF section that receives the communication signal using the reference signal, and outputs a base band signal of the communication signal, a second oscillator that generates a synchronizing purpose signal used to achieve synchronization with the base band signal outputted from the RF section while changing a frequency of the synchronizing purpose signal according to a given setting parameter, a correcting section that corrects the setting parameter so that a frequency of the base band signal coincides with the frequency of the synchronizing purpose signal, and a base band processing section that achieves synchronization with the base band signal using the synchronizing purpose signal to reproduce a signal, wherein the GPS apparatus includes a positioning side reference signal generating section that generates, based on the reference signal, a positioning side reference signal that is reference for an operation of the GPS apparatus, an error calculating section that calculates a frequency error of the reference signal using the setting parameter, a receiving frequency estimating section that estimates a receiving frequency when receiving a satellite signal that is a signal from a positioning satellite, a frequency range calculating section that calculates a frequency range used to search for the satellite signal based on the estimated receiving frequency and the frequency error of the reference signal, and a satellite signal receiving section that receives the satellite signal by searching for the frequency range using the positioning side reference signal.