Patent ID: 6853847
Filing Date: 2005-02-08
Classification: G01S

Abstract:
1. A positioning apparatus for determining a current position of a mobile station located in a communication area utilizing radio waves arriving from a plurality of base stations installed in said communication area, said positioning apparatus disposed in said mobile station, comprising: a received signal generating part which receives radio waves arriving from said plurality of base stations to generate a received signal in accordance with each received radio wave; a direct wave candidate extracting part which extracts at least one or more direct wave candidate for each base station from the respective radio waves arriving from said plurality of base stations based on said received signals; a direct wave candidate estimating part which performs predetermined error correction processing on a direct wave candidate extracted by said direct wave candidate extracting part to estimate at least one or more corrected direct wave candidate; a direct wave deriving part which derives a received signal corresponding to a true direct wave using at least one or more direct wave candidate for each base station within the direct wave candidates and corrected direct wave candidate extracted and estimated in said direct wave candidate extracting part and said direct wave candidate estimating part; and a positioning calculating part which determines the current position of said mobile station based on the received signal corresponding to the true direct wave derived by said direct wave deriving part.