Patent ID: 8193976
Filing Date: 2012-06-05
Classification: G01S

Abstract:
1. A positioning system for estimating a position of a receiver, comprising: distance information acquisition means for acquiring information from signals transmitted by a plurality of signal sources and received by the receiver; distance calculation means for calculating first respective distances, between the plurality of signal sources and the receiver, which are calculated on the basis of the signals transmitted by the plurality of signal sources and received by the receiver; position calculation means for calculating a position of the receiver from information indicating positions of the plurality of signal sources acquired by the distance information acquisition means and the first respective distances calculated by the distance calculation means; distance difference calculation means for calculating second respective distances from the position of the receiver calculated by the position calculation means to the positions of the plurality of signal sources acquired, and for calculating, for each of the plurality of signal sources, differences between the second respective distances and the first respective distances calculated by the distance calculation means; and position accuracy evaluation means for evaluating an accuracy of the position of the receiver calculated by the position calculation means, on the basis of variance of the differences calculated by the distance difference calculation means for each of the plurality of signal sources.