A proximity radar method for a rotary-wing aircraft, implemented by a proximity radar system comprising at least one radar sensor having: - an antenna panel (4; 204; 504), formed of a whole number N greater than or equal to 2, of reception sectors (6, 8; 206, 208, 210, 212; 506 1, 506 2,..., 504 N) and at least one emission sector; and - N reception channels (32, 52; 280, 290, 300, 310; 510 1, 510 2,..., 510 N) configured so as to independently demodulate and then respectively digitise the N reception sectors; and - an emission channel, configured so as to modulate a radar emission waveform on a radar carrier to be emitted by the at least one emission sector; - an electronic computer (72; 332; 514), configured so as to perform proximity radar processing operations and fuse direction/distance map data; and - a display (74; 334; 516) for displaying the proximity situation of the aircraft; the N reception sectors (6, 8; 206, 208, 210, 212; 506 1, 506 2,..., 504 N) being distributed around a predetermined common central point O; and each of the N reception sectors (6, 8; 206, 208, 210, 212; 506 1, 506 2,..., 506 N) having one and the same number NK, greater than or equal to 2, of unitary radiating groups whose position in terms of azimuth and/or in terms of elevation varies between the central point O and the periphery of their sector, and pointing in one and the same pointing direction with an identical radiation pattern; the proximity radar method comprising a sequence of phases T(k) of steps, executed successively as a function of k, k varying from 1 to NK, wherein: each phase T(k) of steps consists in the electronic computer activating, with an interferometric pattern M(k) associated with the rank k, at a rate of one radiating group per reception sector, N active radiating groups associated with said interferometric pattern M(k), whose position in terms of azimuth and/or in terms of elevation varies as a function of the temporal rank k between the central point O and the periphery of their sector without passing through one and the same position again, so as to produce, in correlation, synthetic patterns during computational reception beamforming with a lobe width and the appearance of a number of network lobes that vary as a function of the temporal rank k, and so as to establish a map of rank k of the surroundings in terms of azimuth distance/direction and/or elevation distance/direction cells in which the detected obstacle ambiguities, associated with the network lobes, are removed by virtue of the map(s) provided in the phase or phases preceding and/or following the phase T(k). - an antenna panel (4; 204; 504), formed of a whole number N greater than or equal to 2, of reception sectors (6, 8; 206, 208, 210, 212; 506 1, 506 2,..., 504 N) and at least one emission sector; and - N reception channels (32, 52; 280, 290, 300, 310; 510 1, 510 2,..., 510 N) configured so as to independently demodulate and then respectively digitise the N reception sectors; and - an emission channel, configured so as to modulate a radar emission waveform on a radar carrier to be emitted by the at least one emission sector; - an electronic computer (72; 332; 514), configured so as to perform proximity radar processing operations and fuse direction/distance map data; and - a display (74; 334; 516) for displaying the proximity situation of the aircraft; the N reception sectors (6, 8; 206, 208, 210, 212; 506 1, 506 2,..., 504 N) being distributed around a predetermined common central point O; and each of the N reception sectors (6, 8; 206, 208, 210, 212; 506 1, 506 2,..., 506 N) having one and the same number NK, greater than or equal to 2, of unitary radiating groups whose position in terms of azimuth and/or in terms of elevation varies between the central point O and the periphery of their sector, and pointing in one and the same pointing direction with an identical radiation pattern; the proximity radar method comprising a sequence of phases T(k) of steps, executed successively as a function of k, k varying from 1 to NK, wherein: each phase T(k) of steps consists in the electronic computer activating, with an interferometric pattern M(k) associated with the rank k, at a rate of one radiating group per reception sector, N active radiating groups associated with said interferometric pattern M(k), whose position in terms of azimuth and/or in terms of elevation varies as a function of the temporal rank k between the central point O and the periphery of their sector without passing through one and the same position again, so as to produce, in correlation, synthetic patterns during computational reception beamforming with a lobe width and the appearance of a number of network lobes that vary as a function of the temporal rank k, and so as to establish a map of rank k of the surroundings in terms of azimuth distance/direction and/or elevation distance/direction cells in which the detected obstacle ambiguities, associated with the network lobes, are removed by virtue of the map(s) provided in the phase or phases preceding and/or following the phase T(k).