A UWB radar device having two or more first antennas includes a generating and transmitting assembly of a UWB signal having a predetermined number of generating and transmitting circuits of a UWB signal, a receiving assembly for processing the received UWB signal, and a processing and control logic unit. The predetermined number of generating and transmitting circuits is lower than the number of the first antennas. The UWB radar device further includes a first selector connected with at least one of the generating and transmitting circuits of the signal and with at least two of the first antennas so as to convey the received signal to the first antennas. The processing and control logic unit includes a memory unit, in which a delay and sum algorithm executable by the logic unit is stored so as to manage the change of phase of the signals received in the receiving assembly.