Abstract: A method using an array of ESM receivers comprises; a step of determining a first locus on the basis of a first measurement giving information on the angle difference of arrival of the emission beam on two receivers, the first locus including the points in space giving the same first measurement on the two receivers; a step of determining a second locus on the basis of a second measurement giving information on the direction of arrival on at least one receiver, the second locus including the points in space giving the same second measurement on the receiver; and a step of determining a third locus on which the position of the source is found, the third locus being the intersection of the first locus and of the second locus.

Abstract: A method for passively locating a non-movable transmitter on the ground implemented by a group of at least one receiving station, each of the receiving stations comprising a detector of radars and a time reference, the set of time references being mutually synchronized, the transmitter transmitting a set of periodic pulses, wherein a first estimation of the position of the transmitter is carried out by the Bancroft scheme on the basis of the mean arrival times of the pulses transmitted by the transmitter at the level of each station of the group of at least one receiving station, the result obtained being used thereafter as point for initializing a maximum likelihood scheme so as to converge toward the position of the transmitter.