基于频控阵的递推最小二乘波束形成算法

频控阵通过在阵元间加入远小于载频的频率增量,使波束的空间分布距离-角度二维相关。基于频控阵基本结构,引入两种接收信号处理机制,并对其进行理论推导分析,仿真表明两种机制均能有效接收信号。针对指向误差存在,导向矢量失配导致主瓣发生偏移问题,采用递推最小二乘波束形成算法处理。仿真结果表明,存在指向误差时,该算法在两种机制中均能在目标位置形成主瓣,在干扰位置形成零陷,验证了算法在频控阵中应用的稳健性。

Recursive least squares beamforming algorithm based on frequency diverse array

The frequency diverse array adds the frequency increment which is much smaller than the carrier frequency, and makes the spatial distribution of the beampattern related to the distance and angle. Based on the basic structure of the frequency diverse array, two kinds of receiving signal processing mechanisms are introduced, and theoretical analysis is carried out. The simulation results show that both of them can receive signals effectively. In order to solve the problem of main lobe migration caused by steering vector mismatch, recursive least squares (RLS) beamforming algorithm is adopted. The simulation results show that, in the presence of pointing errors, the algorithm can form a main lobe at the target position and a null at the interference position in both mechanisms, which verifies the robustness of the algorithm in the application of frequency diverse array.