Brief description of the location of a fixed terminal according to a constellation of satellites

摘要

The invention relates to a method of locating a fixed terminal of a telecommunications system comprising a constellation of satellites, a plurality of base stations and a plurality of fixed terminals. According to the invention, the method comprises the stages of "coarse", "average" and "fine ". When the "fine " location phase, the terminal calculates at least three hyperboloids, then the intersection of these latter, assuming a fine " estimated position of the hyperboloid terminal.chaque can be written: hij = dj - di = (t i ′ - t) .c - (ti ′ - ti) .c, where: - di is the distance between the terminal and the position pi of a second satellite active at the time ti, - dj is the distance between the terminal and the position p 1 of the jth satellite active at the instant t i - ti and tj are th and jth instants of transmission, by the ith and jth satellite, respectively, of th and jth information relating to t i and di, and to t i and d respectively - ti and tj ′ are the i th and jth instants of reception, by the terminal, th and jth information, - c is the speed of light.