Four-channel mainlobe jamming suppression for adaptive monopulse at subarray level

The adaptive monopulse at subarray level is required for applying monopulse technique to phased array radar, in which the mainlobe jamming suppression is critical. Aiming at planar phased array, the four-channel system is adopted, where the delta-delta channel is used as an auxiliary channel. The signal model of four-channel system at subarray level is presented. The mainlobe jamming suppression approach, for adaptive monopulse at subarray level, is illustrated, and as return, the jammers are suppressed with nulls along one direction(elevation or azimuth) and undistorted monopulse ratio along the orthogonal direction(azimuth or elevation) is preserved. The proposed approach does not require any correction of the adaptive sum and difference beam outputs. Simulation results demonstrate its validity.