抄録
In car-navigation systems, car position measurement estimates the car's position and heading angle from the out-puts of a GPS receiver and sensors, and calculates the position on a link that represents a road and is recorded in a digital road map. We focus on the latter process, which is map matching. If there are large errors in the car's estimated position and heading angle as well as in link position and direction angle, map matching selects an incorrect link. We previously proposed a map-matching method that calculates the criterion from the error variances of the positions and direction angles of the links, too. However, this method must in advance measure the error variances of the positions and direction angles of the links, which are different from one area to another. This paper proposes a map-matching method with a function to calculate the error variances of the position and direction angle of the links in a digital road map and that can remove the previous measurement work. The performance of this function was evaluated, and the performance of this map-matching method was compared with that of the conventional method by using numerical computation.
