Patent ID: 7197392

Claim:
A method for detecting a map matching position of a vehicle in a navigation system, comprising the steps of: (a) obtaining, by a control unit, coordinates (P 0 ) of a current vehicle location using navigation messages received by a GPS receiver and detection signals of sensors installed on the vehicle; (b) searching map data to find one link to which the coordinates (P 0 ) of the current vehicle location obtained in step (a) will be matched, and obtaining coordinates (P 1 , P 2 ) of both end points of the link; (c) putting the coordinates (P 0 ) of the current vehicle location and the coordinates (P 1 , P 2 ) of both end points of the link into a predetermined formula to obtain coordinates (P) of an intersection point of the perpendicular line connecting perpendicular line ( ) to a line ( ) defined by the coordinates (P 1 , P 2 ) of both end points of the link obtained in step (b); and (d) determining the coordinates of the current vehicle location to be the coordinates (P) of the intersection point obtained in step (c).