| 摘要 |
PURPOSE:To enhance processing rate by suppressing error in map matching. CONSTITUTION:Trace of vehicle is determined using predictive navigation system (n2) based on detection result (n1) from GPS and vehicle speed sensor and a decision is made whether the position of a preceding vehicle exists on a road (n3). When the road on which the vehicle is running can be specified, a group of roads to be connected through a predetermined distance l with the road is extracted (n4) in a first stage and map matching is performed using predictive navigation system (n5, n6). When mapping is not successful, all road groups within a predetermined distance (r) range from the location of the vehicle are extracted (n8) and mapping is performed using predictive navigation system (n9, n10) thus producing a corrected position (n7). |
