1. A process for detecting mobile objects by means of passive underwater buoys making it possible to obtain so-called EGP maps, each buoy allowing the formation of N v directive pathways, wherein the signals from the buoys are processed in three steps: a first step ( 99 - 102 ) making it possible to obtain an EGP map of the x,y positions of the objects, a second step ( 110 - 120 ) making it possible to obtain an EGP map of the velocities Vx,Vy as well as an estimated spectrum for each arbitrary position x,y of the EGP map of the positions, maps exhibiting the Doppler ambiguity loci, a third step ( 140 - 144 ) allowing the elimination from the maps of the objects regarded as strong sources of noise.