| 摘要 |
PROBLEM TO BE SOLVED: To save power while maintaining the accuracy of acquisition of a current location. SOLUTION: An absolute position acquisition unit 30 acquires absolute positions of a terminal body 10 at the spot of a walking start, at a spot separated by a fixed distance L1 and a spot separated by a fixed distance L2 from the spot of the walking start. A current-position acquisition unit 36 acquires the current location of the terminal body, on the basis of a walk route corrected by a walk route corrector 35 by using the absolute positions. In this case, the fixed distance L1 is the distance between two points which make a maximum angle difference between the actual bearing between the two points between which the terminal body moves, and the bearing between two points determined at the two points from absolute positions acquired by the absolute position acquisition unit, within a predetermined range. The fixed distance L2 is the distance between two points which make the ratio of the maximum distance difference between the actual distance between the two points between which the terminal body moves, and the distance between two points determined at the two points from absolute positions acquired by the absolute position acquisition unit to the actual distance, within a predetermined range. COPYRIGHT: (C)2011,JPO&INPIT |
