宽带波束空间恒模阵列

Broadband beamspace constant modulus array

针对期望信号假设来向与实际来向存在误差时,传统的宽带波束空间自适应阵列有较大的性能损失,提出了一种对信号来向误差具有稳健性的算法。该方法利用信号的恒模特性,在期望信号来向未知的情况下,实现了对宽带信号的无失真接收。首先利用扇形滤波器,形成一组具有频率不变性的正交波束,然后基于恒模准则对各波束的输出进行处理得到最优权值。该方法对信号来向具有很强的稳健性,同时具有收敛速度快等优点。通过计算机仿真验证了所提方法的有效性与优越性。

Aimed at traditional broadband beamspace adaptive arrays suffer performance degradation in the presence of errors between the actual and presumed array direction of the desired signal,a novel approach is proposed,which emphasizes the robustness to the errors mentioned above.The proposed algorithm using the character of constant can receive the broadband signal without signal distortion when the direction of the desired signal is unknown.The beamformer forms the beams which can exhibit the frequency invariant property and be linearly independent firstly,and the optimal weight from the output of the beams is computed by utilizing the constant modulus property.The proposed algorithm has not only the robustness to the error but also a fast converge rate.The computer simulation results demonstrate its validity and superiority.