稳健的全阵波束形成方法

Robust full array beamforming algorithm

由于相干干扰和角度估计误差影响波束形成性能,对此提出一种稳健的波束形成方法。采用加权空间平滑算法去除相干性;对期望信号施加约束,保证一定角度估计误差范围内算法的稳健性;进行全阵波束形成变换,避免阵列孔径损失。仿真结果表明,在相干干扰环境中,该算法的方向图在期望信号方向有明显主瓣,有利于接收期望信号;在一定的角度估计误差范围内,该算法可保持比较高的且比较平坦的输出信干噪比;随着输入信噪比的增加,输出信干噪比几乎线性增大。

A robust array beamforming method is proposed, due to the beamforming performance being affected by the coherent interference and angle estimation errors. The weighted spatial smoothing algorithm is used to remove correlation. The constraints on the desired signal are imposed to guarantee the robustness of the algorithm in the certain range of angle estimation errors. The loss of array aperture is avoided by applying full array beamforming transformation. The simulation results show that in coherent interference environment, the pattern of the algorithm has obvious main lobe on desired signal, in favor of receiving the desired signal; the algorithm can maintain higher and flatter Signal to Interference Noise Ratio （SINR）at output in the certain angle estimation errors;as the input Signal to Noise Ratio（SNR）increases, the output SINR of the algorithm increases nearly linearly.