| 摘要 |
PROBLEM TO BE SOLVED: To properly prevent wrong determination of the end determination of a multipath, while the multipath is developing. SOLUTION: This apparatus for measuring moving body position is equipped with a reception means 20A for receiving a signal from a satellite 10, a velocity vector calculation means 60A for calculating a velocity vector V of a moving body; a position measurement/operation means 40 for measuring the position of the moving body; a displacement vector calculation means 50 for calculating a displacement vector M, representing the traveling amount of the moving body based on the history of position measurement results; an angle calculation means for calculating an angle formed by the velocity vector V with the displacement vector M as an evaluation value; and an anomaly determination means 72 for determining whether position measurement made by the measurement/operation means is anomalous, based on the evaluation value. The determination means 72 carries out anomaly determination, to the effect, that position measurement is anomalous where the evaluation value is not less than a prescribed threshold Th1, canceling the anomaly determination, where a time period between the time the anomaly determination is made and the time the evaluation value becomes less than a prescribed threshold Th3, exceeds a prescribed time period Th5, or the moving distance of the movable body exceeds a prescribed distance, and maintaining the anomaly determination where neither the prescribed time period nor the prescribed distance is exceeded. COPYRIGHT: (C)2008,JPO&INPIT
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