| 摘要 |
PROBLEM TO BE SOLVED: To provide a position detecting device capable of determining whether or not there exists an obstacle intercepting a position information signal transmitted from a position information satellite. SOLUTION: This position detecting device has a first present position arithmetic operation means 3 arithmetically operating a present position by receiving the position information signal transmitted from the position information satellite, a second present position arithmetic operation means 4 arithmetically operating the present position by detecting a moving distance and a moving azimuth, obstacle detecting means 8 and 9 detecting the existence of the obstacle intercepting the position information signal and detecting the obstacle by a reflected wave, and a selecting means selecting the first present position arithmetic means when the obstacle is not detected by the obstacle detecting means and selecting the second present position arithmetic operation means when the obstacle is detected. COPYRIGHT: (C)2009,JPO&INPIT |
