Method and device for locating an electromagnetic emission source and system implementing such a method

A method for locating a source of an electromagnetic emission on the basis of an array of ESM receivers, said source emitting an emission beam that scans space, comprising:

• a step of determining a first locus on the basis of a first measurement giving information on the angle difference of arrival of said emission beam on two receivers, said first locus including the points in space giving the same first measurement on said 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, said second locus including the points in space giving the same second measurement on said receiver;
• and
• a step of determining a third locus on which the position of said source is found, said third locus being the intersection of said first locus and of said second locus.