Patent ID: 6950661
Filing Date: 2005-09-27
Classification: G01S

Abstract:
1. A location calculation method using propagation delay time of signals transmitted between a plurality of base stations and a mobile terminal, comprising: a first step of measuring reception timing of signals transmitted between said plurality of base stations and said mobile terminal; a second step of estimating, according to the result of the measurement of the reception timing of signals obtained by said first step, an erroneous result of measurement; a third step of removing the result of the measurement estimated as the erroneous result of measurement by the second step from the result of the measurement of the reception timing of signals obtained by said first step, and thereby calculating the location of the mobile terminal; and a fourth step of determining a standard base station among said plurality of base stations, wherein said second step includes estimating, according to a result of a determination of distance measurement whether or not a triangle is formed, using an estimated distance between the mobile terminal and the standard base station, an estimated distance between the mobile terminal and a base station used as an object of the estimation, and a distance between the standard base station and the base station used as the object of the estimation, wherein the result of the determination of distance measurement for the base station used as the object of the estimation not satisfying the triangle forming condition is an erroneous result of measurement.