Patent ID: 7043257
Filing Date: 2006-05-09
Classification: G01S

Abstract:
1. A positioning apparatus for determining a present position of a mobile station by using radio waves coming from a plurality of base stations arranged within a communication area, the positioning apparatus being arranged in said mobile station, the positioning apparatus comprising: receiving means for receiving the radio waves coming from said plurality of base stations to generate reception signals corresponding to the respective radio waves; direct wave candidate extracting means for extracting a plurality of direct wave candidates of the radio waves coming from said respective base stations, out of said reception signals generated by said receiving means; deriving means for deriving reception signals equivalent to direct waves from said plurality of direct wave candidates extracted by said direct wave candidate extracting means; and positioning operation means for determining the present position of said mobile station from said reception signals derived by said deriving means; wherein said direct wave candidate extracting means extracts said direct wave candidates out of reception signals generated from radio waves coming to said receiving means within a predetermined time since the point of start of positioning.