A method for geolocating a terminal of a wireless communication system, said wireless communication system including fixed base stations, and a geolocation server connected to said fixed base stations, the geographical position of each fixed base station being known by said server, said geolocation method including: - a measurement, for at least one fixed base station, of a parameter representative of a radio signal exchanged between the terminal and said fixed base station, - an estimate of a rough geographical position of the terminal from the measurement(s) thus obtained and from the geographical position of each fixed base station for which a measurement has been obtained, - a determination of a search area from the estimated rough geographical position, - a displacement of a mobile base station in said search area during a predetermined search period, said mobile base station being connected to the geolocation server, - an emission, by the terminal, of at least one radio signal during the search period, each radio signal being emitted to the fixed base stations of the wireless communication system and of the mobile base station, - a measurement, for each radio signal emitted by the terminal during the search period, of a parameter representative of said radio signal for at least one fixed base station and for the mobile base station, - a determination, for each radio signal emitted by the terminal during the search period, of a geographical position of the mobile base station at the time when said radio signal is emitted, - an estimate of a precise geographical position of the terminal, on the one hand, from said measurements obtained during the search period, and on the other hand, from the geographical position of each fixed base station for which a measurement has been obtained during the search period and from the geographical position of the mobile base station at the time of emission of each radio signal emitted by the terminal during the search period. - a measurement, for at least one fixed base station, of a parameter representative of a radio signal exchanged between the terminal and said fixed base station, - an estimate of a rough geographical position of the terminal from the measurement(s) thus obtained and from the geographical position of each fixed base station for which a measurement has been obtained, - a determination of a search area from the estimated rough geographical position, - a displacement of a mobile base station in said search area during a predetermined search period, said mobile base station being connected to the geolocation server, - an emission, by the terminal, of at least one radio signal during the search period, each radio signal being emitted to the fixed base stations of the wireless communication system and of the mobile base station, - a measurement, for each radio signal emitted by the terminal during the search period, of a parameter representative of said radio signal for at least one fixed base station and for the mobile base station, - a determination, for each radio signal emitted by the terminal during the search period, of a geographical position of the mobile base station at the time when said radio signal is emitted, - an estimate of a precise geographical position of the terminal, on the one hand, from said measurements obtained during the search period, and on the other hand, from the geographical position of each fixed base station for which a measurement has been obtained during the search period and from the geographical position of the mobile base station at the time of emission of each radio signal emitted by the terminal during the search period.