Patent ID: 7746271

Claim:
A method for increasing accuracy of a global position of a user receiver determined by a navigation system of the user receiver, wherein: a global position of a mobile reference receiver is determined by a navigation system of the mobile reference receiver; at least one stationary landmark is detected by the at least one object detection sensor; a relative position of the at least one stationary landmark relative to the mobile reference receiver is determined by a sensing system based on data from at least one object detection sensor; a global position of said at least one stationary landmark in at least one spatial direction is determined based on a digital map; a position error of the global position of the mobile reference receiver is calculated for at least one spatial direction based on the global position of the at least one stationary landmark, the relative position, and the global position of the mobile reference receiver; and the position error is transmitted from the mobile reference receiver to the user receiver to increase the accuracy of the global position of the user receiver determined by the navigation system of the user receiver.