Patent ID: 7999732

Claim:
A GPS measuring method in which a receiver terminal having a local oscillator portion receives a signal from a satellite and obtains pseudorange between the receiver terminal and the satellite, comprising a process in which the receiver terminal receives from an externally-located oscillator portion a frequency more accurate than that of the local oscillator portion, the local oscillator frequency is measured with reference to the frequency of the externally-located oscillator, thus determining the error of the local oscillator frequency, a plurality of candidate values for accurate local frequency error are set within a predetermined frequency range including the error of the local oscillator frequency, the signal from the satellite is processed by a bank of correlators using the combination of the Doppler data from a base station and the candidate values for local oscillator frequency error, the accurate frequency error and the signal delay value are detected from the result of the correlation calculations, and the pseudorange to the satellite is detected from the delay value.