| 摘要 |
PROBLEM TO BE SOLVED: To construct a positioning system independently without using an existing positioning system at the mobile station but with efficient concomitant use of a usual radio communication service.SOLUTION: A mobile communication system able to detect the position of a mobile station comprises a mobile station that calculates a round-trip propagation delay time by subtracting a fixed station response processing delay time from the time difference between transmission timing when the mobile station transmitted and reception timing of response signals to the mobile station from fixed stations about which the plurality of fixed station are asynchronous, and estimates the distance between the plurality of fixed stations and the mobile station on the basis of the round-trip propagation delay time and radio wave propagation speed. A different fixed station response delay time corresponding to a fixed station identification number is set regarding the fixed station response processing delay time from the plurality of fixed stations. The plurality of fixed stations comprise the means for recognizing the fixed station response processing delay time corresponding to the fixed station identification number, and the plurality of fixed stations and the mobile station comprise means for giving notice of the recognized fixed station response processing delay time. |
