递归的稳健LCMV波束形成算法

提出了一种针对指向误差、阵元位置误差或阵元相位误差的递归的稳健波束形成方法。该方法基于导向矢量展开算法,在采用线性约束LMS算法递归搜索最优权矢量的同时,搜索真实的期望信号导向矢量。导向矢量的计算采用基于梯度搜索的最优化算法。该方法避免了常规LCMV算法的矩阵求逆运算,所需运算量小。对存在几种特定误差情况的计算机仿真结果表明,该方法稳态性能优越,对期望信号导向矢量的误差具有很好的稳健性。

Recursive robust LCMV beamforming algorithm

An approach is proposed for recursive robust beamforming in the presence of steering error,array geometry error and sensor phase error.The basic idea is to search the optimal weight vector with recursive linearly constrained LMS updating, based on the steering vector-expanded algorithm,jointly search the actual array steering vector of the desired signal.The steering vector is obtained using gradient-based optimization algorithm.The algorithm avoids the inverse of the sample covariance matrix,and thus enjoys lower computational complexity.Simulations under a few scenarios in the presence of given errors demonstrate that this algorithm has better performance than other recursive beamformers,and has good robustness to the steering vector error of the desired signal.