| 摘要 |
PURPOSE:To detect the position of the moving body with high accuracy by determining the position of the moving body by comparing position data which indicates an error range including a position generated with the signals of GPS satellites with a relative map. CONSTITUTION:A GPS computing element 2 outputs 1st position data on a circle B with a radius (d) including a 1st position shown in a figure (b) according to the received signals from the GPS satellites GPS1 - GPS3, reads map data showing a map of the periphery of the circle B, e.g. a map including roads (a) - (c) as shown in a figure (c) out of a map data memory 3, and matches the 1st position data with the map by a map matching computer element 4 to find the road (c) in the circle B and a position P2 at the shortest distance (e) from the position P1 on the road (c), thereby outputting their data. Consequently, the map including the roads (a) - (c) and the position P2 showing the current position of the moving body on the road (c) are displayed on a display unit 5. |
