Patent ID: 8106817
Filing Date: 2012-01-31
Classification: G01S

Abstract:
1. A positioning system for estimating the position of a receiver that has a wireless communication function and a receiving function for signals used in GPS positioning, the system comprising: reception state information acquisition means for acquiring reception state information indicating the reception state of a radio wave produced by the wireless communication function of the receiver; approximate position estimation means for estimating the approximate position of the receiver and computing the precision of the approximate position on the basis of the reception state information acquired by the reception state information acquisition means; end decision means for deciding whether or not to end the estimation of the position of the receiver on the basis of the precision computed by the approximate position estimation means, and, if it is decided to end the estimation, estimating the position of the receiver as the approximate position estimated by the approximate position estimation means and ending the estimation of the position; indoor/outdoor determination means for determining whether the receiver is indoors or outdoors on the basis of the reception state information acquired by the reception state information acquisition means; and positioning control means for controlling the execution of GPS positioning of the receiver on the basis of a result of decision by the end decision means and a result of determination by the indoor/outdoor determination means.