| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a position measuring apparatus by which the search processing operation of a carrier can be reduced. SOLUTION: A downconversion part 104 which receives a signal from a satellite so as to be converted into an intermediate-frequency signal and a carrier search part 1000 in which carrier waves in a received signal are searched on the basis of the output of the downconversion part 104 are provided at this position measuring apparatus 100. The carrier search part 1000 separates the received signal into an in-phase channel signal and an orthogonal channel signal, and it performs a real fast Fourier transform operation after it performs a spectrum back-diffusion processing operation. Regarding a signal which corresponds to 0 Hz out of respective frequency components, it is corrected by the sum total of the orthogonal channel component, and the frequency difference between a local carrier and carrier waves is found.</p> |
