| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a new method for determining a search frequency highly accurately. <P>SOLUTION: In a cellular phone 1, correlation operation between a received signal of a GPS satellite signal modulated by a direct spectrum diffusion system by a PRN code and replica code of the PRN code is performed with respect to each IQ component in a prescribed frequency search range. Each I, Q correlation value acquired by the correlation operation is integrated in each unit period at a polarity inversion timing interval, to thereby calculate an I, Q correlation integrated value, and I, Q correlation integrated values in each two-unit period portion are added in each combination in which signs are changed. One combination is selected based on an addition result of each combination, and a search center frequency is corrected based on a change with time of an IQ phase (peak IQ phase) of a peak value of the correlation integrated value of the selected combination. <P>COPYRIGHT: (C)2010,JPO&INPIT |
