| 摘要 |
PURPOSE:To more correctly decide a target intersection by providing a means for preventing an erroneous recognition of the target intersection for changing the running distance error range width. CONSTITUTION:In a RAM 9, data of an intersection for turning on a route, etc., for instance, the number of intersections, a position of the intersection, etc. are stored together with an inter-intersection allowable error range data. As for an allowable error between each intersection, usually, that of prescribed width is used, and for instance, in case a target intersection for turning has entered into an allowable error range E, a vehicle is turned to the right or the left, and the navigation is continued by combining the detecting signals of a distance sensor 3 and an azimuth sensor 2. In such a way, in case a confusing intersection D being similar to a target intersection C exists in the range E, the allowable error width is set to a narrow range L, and the error width is changed so that the intersection D does not enter into the allowable range. In this case, by comparing a target data on a route with an actual data, for instance, an intersection offered by a navigation device with regard to the intersection, and executing a comparison of the inter-intersection distance and the advance direction, etc., their coincidence is decided, and if they are different, it is known by an alarm 14 that a recommended path for turning has been mistaken. |
