| 摘要 |
PURPOSE: To prevent the occurrence of such a case that the present location of a vehicle is corrected to a location along a road on a road map by map matching when the vehicle travels a road which is not drawn on the map by exactly judging that the vehicle travels along the road. CONSTITUTION: A microprocessor 214 calculates the difference between the traveling azimuth of its own vehicle and a road drawn on a road map from the outputs of various kinds of sensors 201, 202, and 203 and the presence/ absence of sudden turns made by the vehicle and, when the difference between the traveling azimuth of the vehicle and the road drawn on the road map becomes larger, because vehicle makes a turn against the azimuth of the road, determines the position found from the present location of the vehicle determined last time and the traveling distance of the vehicle as the present location of the vehicle without correcting the present location to a location along the road on the road map by executing map matching. |
