Patent ID: 6766247
Filing Date: 2004-07-20
Classification: G01C

Abstract:
A position determination method operating by means of adjustment of a position determined by dead reckoning with the aid of a digital road map, comprising the following steps:a succession of positions determined by dead reckoning is tracked on digitized roads of the digital road map and assigned to road segments of the digital road map, during traversal of a curve the centroid of the curve is determined from measured values of a direction sensor, the centroid of the curve of a digitized road is determined from the alignment of road segments of the digitized road which corresponds to the determined positions, and â€ƒthe position determined by dead reckoning is corrected on the basis of the difference between the determined curve centroids, wherein the centroid of the curve recorded in the digital road map is calculated by weighting differences in the angles of consecutive road segments in their succession and adding them, and dividing the sum thus determined by the sum of the differences in the angles of the consecutive road segments.