A method for geolocating a signal-transmitting device, said signal-transmitting device transmitting a radio signal, the geolocation method comprising: a. supplying positions of a plurality of reception stations (3, GWi) of a radio communication network and dates of reception ( T i) of the radio signal by said reception stations (3, GWi), b. selecting a reference station (3, GWi) from among the plurality of reception stations (3, GWi), c. defining a scanning zone as a function of the positions (Xi, Yi) of said reception stations (3, GWi), d. subdividing the scanning zone into a plurality of subzones as a function of a scanning granularity, e. for each subzone (17, 25, 28), calculating a degree of cumulative error of said subzone (17, 25, 28), the calculation of the degree of cumulative error of said subzone (17, 25, 28) comprising: ∘ determining a tested position (k,l) included in said subzone (17, 25, 28), ∘ calculating, for each reception station (3, GWi) a respective transmission error parameter E i k, l as a function of a date of reception ( T i) of the radio signal by said reception station (3, GWi), of a date of reception of the radio signal by the reference station ( T 0), of a speed of propagation of the radio signal, of a distance d i k, l between the tested position (k,l) and said reception station (3, GWi) and of a distance d 0 k, l between the tested position (k,l) and the reference station, ∘ calculating the degree of cumulative error of the subzone (17, 25, 28) as a function of the transmission error parameters E i k, l calculated for all of the reception stations (3, GWi), f. selecting a subzone (22, 27) exhibiting a minimal degree of cumulative error as subzone (22, 27) of location of the signal-transmitting device, g. defining a new scanning zone (23, 26), the new scanning zone (23, 26) including and being centered on the location subzone (22, 27) selected in the step f), h. defining a new scanning granularity lower than the scanning granularity, i. iterating the method from the step d) with the new scanning zone (23, 26) as scanning zone (23, 26) and the new granularity as granularity, characterized in that, on each iteration, the new scanning zone (23, 26) is defined in the step h) as equal to the location subzone (22, 27) selected in the step f) augmented by a margin completely surrounding the location subzone (22, 27) and whose width is greater than the scanning granularity. a. supplying positions of a plurality of reception stations (3, GWi) of a radio communication network and dates of reception ( T i) of the radio signal by said reception stations (3, GWi), b. selecting a reference station (3, GWi) from among the plurality of reception stations (3, GWi), c. defining a scanning zone as a function of the positions (Xi, Yi) of said reception stations (3, GWi), d. subdividing the scanning zone into a plurality of subzones as a function of a scanning granularity, e. for each subzone (17, 25, 28), calculating a degree of cumulative error of said subzone (17, 25, 28), the calculation of the degree of cumulative error of said subzone (17, 25, 28) comprising: ∘ determining a tested position (k,l) included in said subzone (17, 25, 28), ∘ calculating, for each reception station (3, GWi) a respective transmission error parameter E i k, l as a function of a date of reception ( T i) of the radio signal by said reception station (3, GWi), of a date of reception of the radio signal by the reference station ( T 0), of a speed of propagation of the radio signal, of a distance d i k, l between the tested position (k,l) and said reception station (3, GWi) and of a distance d 0 k, l between the tested position (k,l) and the reference station, ∘ calculating the degree of cumulative error of the subzone (17, 25, 28) as a function of the transmission error parameters E i k, l calculated for all of the reception stations (3, GWi), ∘ determining a tested position (k,l) included in said subzone (17, 25, 28), ∘ calculating, for each reception station (3, GWi) a respective transmission error parameter E i k, l as a function of a date of reception ( T i) of the radio signal by said reception station (3, GWi), of a date of reception of the radio signal by the reference station ( T 0), of a speed of propagation of the radio signal, of a distance d i k, l between the tested position (k,l) and said reception station (3, GWi) and of a distance d 0 k, l between the tested position (k,l) and the reference station, ∘ calculating the degree of cumulative error of the subzone (17, 25, 28) as a function of the transmission error parameters E i k, l calculated for all of the reception stations (3, GWi), f. selecting a subzone (22, 27) exhibiting a minimal degree of cumulative error as subzone (22, 27) of location of the signal-transmitting device, g. defining a new scanning zone (23, 26), the new scanning zone (23, 26) including and being centered on the location subzone (22, 27) selected in the step f), h. defining a new scanning granularity lower than the scanning granularity, i. iterating the method from the step d) with the new scanning zone (23, 26) as scanning zone (23, 26) and the new granularity as granularity,