| 摘要 |
PURPOSE:To perform accurate matching, by a method wherein the average azimuths of a definite running distance before and after one's own car passes a corner when it is detected that said car begins to turn the corner and the matching of the present position of one's own car is taken on the basis of the difference between the average azimuths. CONSTITUTION:It is detected that one's own car begins to turn a corner, on the basis of the data from an one's own car position estimation means 3 by a corner detection means 6. Whereupon, the first and second average azimuth calculation means 7, 8 calculate the average azimuths of a definite running distance before and after one's own car passes the corner. The passage of the corner is detected on the basis of the difference between the average azimuths calculated by the first and second average azimuth calculation means 7, 8 by a corner specifying means 9 to take the matching of the present position of one's own car with the road on the map stored in a map data memory means 4. By this method, it can be accurately detected that one's own car passes the corner or a crossing. |
