| 摘要 |
PROBLEM TO BE SOLVED: To enhance the positional accuracy by correcting the absolute position data and relative position data obtained by an automatic navigation so as to allow the advancing direction and center-of-gravity position of the data to coincide. SOLUTION: An altitude and longitude detector 3 calculates the altitude and longitude from the reception signal of a GPS (general global position measuring system) receiver 1. An autonomic navigation sensor 3 detects the distance and direction by a distance sensor 3a and direction sensor 3b. A moving amount detector 4 calculates the relatively moved amount. A calculator 6 obtains the traveling locus. The calculator 6 selects the point of bending at a predetermined angle or more as a node point, and sets the line segments between the node points as an element. The calculator 6 so moves the element of the autonomic navigation that the advancing direction and center-of-gravity position of the element obtained by the autonomic navigation coincide with those of the element obtained by GPS to correct the position data. The distance information of the autonomic navigation having small error and the directional information of the GPS are combined to be corrected to improve the positional accuracy of measuring the traveling locus. |
