接收多径相干信号的鲁棒自适应波束形成算法

Robust Adaptive Beamforming Algorithm for Multiple Coherent Signals Reception

为有效接收多径相干信号,该文提出一种基于波束主瓣幅度约束的鲁棒自适应波束形成算法。该算法充分利用多径相干信号的来波信息,对接收数据协方差矩阵统计量进行优化,并对多径相干信号波束主瓣进行幅度约束,通过一阶泰勒展开将多径相干信号的优化问题转换为迭代二阶锥规划问题,获得最佳波束形成权矢量。该算法不仅能够有效接收多径相干信号,抑制干扰和噪声,而且能够克服较大导向矢量失配误差,自由控制鲁棒响应区的波束宽度和纹波水平。仿真实验验证了算法的正确性和有效性。

To receive multiple coherent signals effectively,a robust adaptive beamforming algorithm based on the beam main lobe magnitude constrained is proposed in this paper.Fully utilizing the direction of arrival （DOA） information of multiple coherent signals,the proposed method optimizes the receiving data covariance matrix estimator and constrains the beam main lobe magnitude of multiple coherent signals.Then the optimization problem of multiple coherent signals reception is described as an iterative Second-Order Cone Programming （SOCP） problem by the first order Taylor expansion.Thereby obtain the optimal beamforming weight vector.The novel approach can not only receive multiple coherent signals andsuppress the interference signals and noises effectively,but also overcome the large steering vector mismatch and control the width and the ripple level of the beam main lobe flexibly in the robust response region.Simulations verify the correctness and validity of the novel approach.