Abstract: The invention relates to a device for passively or actively detecting a target which scatters a useful signal and which is immersed in an observed area comprising elements that are likely to generate clutter echoes forming a non-useful signal, the useful signal having a coherent scattering lobe that is greater than that of the non-useful signal for a given wavelength and given direction, said device including means for receiving the signal scattered by the target, said receiving means including: at a given moment t, at least two separate reception portions having the same polarization, each portion including at least one receiver and one phase center; and a processing means enabling the mutual correlation between at least two received signals, or between at least two signals constructed from signals received at a moment t, each of said received signals being received by a receiver of one of said at least two separate reception portions, characterized in that the phase centers of said at least two reception po