基于密度锥削阵的FDA-MIMO抗随队干扰方法OA

To address the problems of main-lobe distortion in traditional phased arrays and multi-extremum beams in basic frequency diverse array(FDA)under escort jamming,a escort jamming suppression method based on a density tapered array(DTA)for frequency diverse array multiple-input multiple-output(FDA-MIMO)is pro-posed.First,the DTA equipped with a sinusoidal frequency control function is introduced into the FDA system to optimize the energy focusing of the transmit beam.Then,the Newton-steepest descent linear constrained mini-mum variance(Newton-SD-LCMV)adaptive beamforming algorithm is proposed to correct the mismatch of the steering vector.Simulation results go as below:The proposed method reduces the angular main-lobe width by 37.5%,the range-dimensional main-lobe width by 50%,and lowers the sidelobe level by 7.3 dB.In a strong an-gle-coupling scenario,the output signal-to-interference-plus-noise ratio(SINR)reaches 30.5 dB,which is 11.9 dB higher than that of the basic FDA-MIMO.Under a 2° pointing error,the target gain loss is only 0.2 dB,and the jamming null depth can reach as deep as-36.8 dB.The method can precisely suppress escort jamming in range-an-gle coupling scenarios.