New Adaptive Beamformer for Coherent Interference Based on Multistage Blocking
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摘要: 针对期望信号波达角(DOA)估计误差较大时相干波束形成性能下降的问题，该文提出一种基于多级阻塞的稳健相干自适应波束形成算法。该算法首先定义阻塞矩阵，推导多级阻塞原理，并利用其滤除阵列接收信号中的期望信号；然后给出空间中只存在期望信号时，子阵与全阵间阵列流型的映射关系，据此推导全阵扩展变换，并证明其在干扰信号存在条件下的有效性；最终利用扩展变换获取全阵最优权矢量，实现相干波束形成。该算法对期望信号波达角估计误差稳健，且无需干扰信号来向的先验信息，同时可以有效避免阵列孔径的损失。仿真分析验证了算法的优越性和理论分析的有效性。Abstract: Since the performance of adaptive beamforming algorithm for coherent signals degrades when the estimation error in the Direction Of Arrival (DOA) of the desired signal is large, a new multistage blocking based beamforming algorithm for coherent interference suppression is proposed. Firstly, the blocking matrix is constructed and the principle of multistage blocking is derived, with which the received signal is processed to remove the desired signal component. Then the mapping between the array manifold of sub-aperture array and the full-aperture array is analyzed when only the desired signal exists in the space. On this basis, the extension transformation is derived with its effectiveness proved in the presence of interference signals. At last, the optimal weight vector of the adaptive beamformer for coherent interference is obtained by extension transformation. Requiring no prior information of the DOA of the interference signals, the new method is robust to the DOA estimation error, and can avoid the loss of array aperture. The effectiveness and superiority of the new algorithm are verified by simulation analysis.
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