| 摘要 |
PROBLEM TO BE SOLVED: To improve measurement accuracies of a position or the like by accurately determining whether a received GPS signal is multipath. SOLUTION: A receiving device 111 receives a GPS signal (electric wave) (S11). A pseudo-distance measurement section 112 calculates a pseudo distance based on the GPS signal, and a pseudo-distance difference calculation section 113 calculates variation (pseudo-distance difference) of the pseudo distance (S12-S14). A phase distance difference measurement section 114 calculates variation (phase distance difference) of phase distance based on the GPS signal (S15-S16). A multipath determination section 115 compares the pseudo-distance difference with the phase distance difference, and determines whether the GPS signal received by the receiving device 111 is multipath (S17). A position calculation section 130 rejects the pseudo distance determined to be multipath by the multipath determination section 115, and calculates the current position based on the other pseudo distances (S18). COPYRIGHT: (C)2008,JPO&INPIT
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