一种自适应迭代宽带数字波束成形算法

An Adaptive Iterative Broadband DBF Algorithm

为了克服传统宽带波束合成要求期望信号垂直入射阵面的苛刻要求,新算法首先利用数字时延滤波器对接收数据的时延进行补偿,使其等效为期望信号垂直入射,然后采用无需计算矩阵求逆的基于LMS的空时自适应滤波算法完成波束形成。方向图仿真表明,新算法能够实现宽带抑制,可高分辨率地使主瓣对准期望,零陷对准干扰;同时通过计算量分析,相对于DMI算法,新算法很大程度地降低了计算复杂度,减小了计算量,易于工程实现。

To overcome the drawback that the desired signal is required to be normal incident on the array,the new algorithm compensates the delay of receiving data by using digital delay filters firstly to make the angle of incidence zero and then use the space- time adaptive filtering algorithm based on LMS to complete beamforming. Pattern simulation results shows that the new algorithm enables broadband interference suppression,which align the main lobe to expectation and nulls to interference with high resolution. At the same time through computational analysis,relative to the DMI algorithm,new algorithm significantly reduces computational complexity and the amount of calculation,therefore its implementation in engineering becomes easy.