频率不变约束的角加载稳健宽带波束形成算法

应用角加载技术能够提高波束形成算法稳健性,但是角加载量确定却是一个难解决问题。文中提出了一种基于频率不变约束的可变角加载最优稳健波束形成算法(Frequency Invariance Constraints-Variable Diagonal Loading,FIC-VDL)。该算法基于宽带波束形成的时域模型,根据多频点约束下导向矢量的不确定范围,利用频率不变约束因子将多频点变为参考频点约束来求解最优角加载量,并推导出真实的导向矢量。该方法能够改善宽带波束形成器在期望方向的频率不变特性,同时降低系统计算复杂度。计算机仿真结果验证了所提算法的稳健性。

Diagonal Loading Robust Broadband Beamforming Algorithm Based on Frequency Invariant

Diagonal loading technique can improve the robustness of beamforming algorithm, however, it is hard to determine the value of diagonal loading. Frequency invariance constraints-variable diagonal loading optimal robust algorithm(Frequency Invariance Constraints-Variable Diagonal Loading, FIC-VDL) is proposed in this paper. It is based on time-domain broadband beamforming model, according to uncertainty set of the multi-frequency steering vector constraints, it changes multiple frequencies into reference frequency point invariance to get the optimal diagonal loading and the real steering vector by using frequency invariance constraint. The method can improve frequency-invariance performance of broadband beamforming in the desired direction and reduce computational complexity. Computer simulation results demonstrate the robustness of the proposed algorithm.