稳健的宽带多径干扰抑制波束形成算法

Robust Wideband Beamfoming Algorithm to Suppress Multipath Interference

针对传统宽带多径干扰抑制波束形成算法计算量大、稳健性差的问题,提出一种基于均匀直线阵的稳健宽带多径干扰抑制波束形成算法。当期望信号垂直入射时,该算法首先在波束旁瓣区域引入虚拟干扰源构造能量聚焦矩阵,通过主瓣宽度的迭代处理,整体控制输出波束旁瓣级,将旁瓣区域能量聚焦到主瓣区域,实现多径干扰条件下的宽带波束形成;然后对期望信号和辅助方位角施加相位响应约束,将其扩展至期望信号非垂直入射和存在指向误差的情况,与传统宽带多径干扰抑制波束形成算法相比,在提高算法稳健性的同时大大降低了计算复杂度;最后仿真分析与实际数据验证表明,该算法能够有效的抑制多径干扰,稳健性较好且具有较高的输出信干噪比。

In order to solve the computational complexity and robustness problem of traditional wideband multipath interference suppression beamforming algorithms, a robust algorithm based on uniform linear array is proposed. First of all, when the desired signal normal incidence, this algorithm introduces virtual interferences in sidelobe region to construct energy focusing matrix, and wholly controls the output beam sidelobe level by iterative processing of mainlobe, then it focuses sidelobe energy to mainlobe to achieve wideband beamforming in multipath environment. Furthermore, this algorithm is extended to the case of desired signal non-normal incidence and direction error existing, through imposing phase response constraints to desired signal and auxiliary azimuth. Comparing with the traditional algorithms, the proposed algorithm has lower computational complexity and better robustness. Finally, the simulation and actual data analysis results show that the algorithm can suppress the muhipath interference effectively, attain better robustness and higher output signal to interference noise ratio （SINR）.