| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a satellite positioning system that has a high precision and is very fast in processing speed even in the case of a very weak static-laden signal from a satellite. <P>SOLUTION: A satellite positioning system in which a receiving terminal having an internal oscillation section receives a signal from a satellite and calculates a pseudo-distance from the satellite according to the signal thus received. The receiving terminal obtains a large number of pieces of data incrementally lagging a slight amount of time i behind data corresponding in a predetermined amount of time T to a signal obtained by eliminating, from the received signal, the value of a frequency error due to the Doppler effect of the satellite. Next, the large number of pieces of data are divided into a plurality of blocks B, and each of the blocks B is subjected to correlated calculation and FFT computation in sequence. Then, the value of a frequency error in the internal oscillation section is detected by synchronously adding data acquired through computation for each block B. The receiving terminal includes a quasi-distance detection section for calculating the pseudo-distance according to the received signal from which the value of the frequency error due to the Doppler effect of the satellite and the value of the frequency error in the internal oscillation section have been eliminated. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
