| 摘要 |
According to the present invention, even when a road is in such condition that error may occur in detecting the position of a vehicle when only internal sensors are used, a lane on a road where the vehicle is currently traveling is determined, and the error is reduced. Traveling lane identifying means 17 is provided on a conventional type car navigation system, and a lane where the vehicle is currently traveling is identified, and it is inquired to map database as to whether the identified lane is an exclusive lane for right turn, left turn or advancing straight ahead. As a result, when it is found that it is an exclusive lane, processing of the position calculating means 15 is carried out only to a road ahead connected to advancing direction of the exclusive lane. After the vehicle has passed through an intersection, more accurate position can be calculated.
|
