宽带聚焦数字波束形成技术

分析了宽带信号波束形成研究的应用背景，并概述其国内外研究现状以及所提出方法的基本思路和应用范围。根据最近提出的频率域频率不变波束形成技术需要进行方位角初次估计和进行多次奇异值分解的问题，提出了在任意传感器阵列存在误差和互耦的情况下，基于摄动方法的宽带信号方位估计算法。该方法在考虑阵列位置、增益和相位测量误差和阵元之间存在互耦的情况下，提出了聚焦矩阵的摄动算法；最后，利用聚焦求和窄带方位估计的方法对宽带信号进行方位估计。

Wideband Digital Beamforming based on Focusing Method

In this paper, the application background of wideband signal beamforming is analyzed, and technology development and application range of many classical methods are summarized. Due to need preliminary angle estimation and large numbers of singular value decompositions in the method of frequency-domain frequency-invariant beamformers, a new wideband signal direction-of-arrival estimation algorithm based perturbation method is proposed in the presence of the non-ideal arbitrary sensor array and the mutual coupling between array elements. The perturbation method of focusing matrix is derived in the condition of having the errors of the actual positions, gains and phases, and mutual coupling. Lastly, the direction-of-arrival of the wideband signals are estimated by sum of focusing matrixes and narrow estimation method.