| 摘要 |
A navigator for use aboard a vehicle includes means for detecting the running distance of the vehicle, means for detecting the angle of the advancing direction of the vehicle with reference to terrestrial magnetism, arithmetic operational means for calculating the coordinates of the position of the vehicle in response to the detected running distance and angle of direction, a memory for storing data regarding the coordinates of the points of correction set at intersections of roads on a map corresponding to an area in which the vehicle is traveling, the distances between the points of correction, and the angles of roads branching from the points of correction with reference to terrestrial magnetism, a locating means for judging whether the vehicle is within a predetermined distance from a point of correction by comparing the coordinates of the present position of the vehicle with the coordinates of the points of correction stored in the memory, a means for judging whether the vehicle has made a turn, and a second arithmetic operational means for calculating the ratio of a reference distance between first and second reference points of correction to the measured distance between the first and second reference points of correction from the means for detecting the running distance, to obtain a compensation coefficient in determining the actual distance traveled by the vehicle. |
