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针对近场强干扰源扰动导致近场自适应波束形成器的性能降低问题,提出了一种近场零陷展宽方法.在干扰源附近区域布置多个近场虚拟干扰源,以此构造出一个新的阵列协方差矩阵替代原阵列协方差矩阵,结合自适应波束形成技术就可以获得展宽的零陷.不同于远场零陷展宽方法,该方法须要预估干扰源的位置.仿真结果表明:在低快拍的条件下,该方法可以提高对弱目标的检测能力,性能远好于近场MVDR(最小方差无畸变响应)算法,并且在存在干扰位置估计误差的情况下,依然可以对弱目标定位,体现了该方法的鲁棒性.
In order to reduce the performance of near-field adaptive beamformer caused by the disturbance of near-field strong interferers, a near-field null notch broadening method is proposed, in which several near-field virtual interference sources are arranged in order to construct a The new array covariance matrix replaces the original array covariance matrix, and combined with adaptive beamforming technique can obtain a stretched null null. Unlike the null spread width method in the far field, this method needs to estimate the position of the interference source. The simulation results show that: Under the condition of low snap-shot, the proposed method can improve the detection of weak targets and the performance is far better than the MVDR (Minimum Variance and No Distortion Response) algorithm in the near-field and can still be weak in the presence of the estimation error of the interference position The goal orientation reflects the robustness of this method.