| 摘要 |
PURPOSE:To display a more correct position of a driver's own vehicle by correcting the coordinate position of the vehicle when the detected coordinates of the vehicle has an error of a prescribed value or above from the coordinates of a position obtained from a position evaluation signal received from outside. CONSTITUTION:The coordinates of a starting place are set in a detector 1 of the coordinates of a driver's own vehicle by a coordinates-setting switch 2. Based on data from a vehicle speed sensor 3 and an azimuth sensor 5, the present position is calculated by the detector 1. When a position detected from self-navigation is apart in a relatively large degree from an actual running point, a coordinate position indicated by a coordinate information supplied to a coordinate error decision circuit 10 from a decoder 9 and the coordinate position detected from the self-navigation by the detector 1 are judged to be apart from each other by a distance of 20m or above, for instance, in a straight line, and the detected coordinates from the self-navigation are judged to have a large error. Accordingly, the coordinate position indicated by the information supplied from the decoder 9 is judged to be more correct and this coordinate position obtained from the reception is set as the present point in the detector 1. |
