一种宽带恒定束宽DBF技术实现方法

An Implementation Method of Digital Beamforming for Broadband Constant Beamwidth

针对常规DBF方法不适用于宽带信号的问题提出一种宽带恒定束宽DBF方法。根据空间重采样理论将均匀线阵视为空间离散采样,利用内插定理得到各阵元在不同频点上的加权系数矩阵。利用维纳滤波理论设计宽带波束合成器拟合加权系数矩阵,实现宽带内波束指向一致,宽度相等。给出了理论分析依据及仿真结果,仿真结果表明了该方法具有计算复杂度低、稳健性强的优点。

The conventional DBF method is not suitable for the wideband signal. Aiming at this problem, this paper proposes a beamforming technique with constant beamwidth. Based on spatial resampling theory, the uniform linear array is used as the discrete samphng of a continuous linear arrays,the weighting matrix of every array element at different frequency points is obtained. By using the wiener filtering technique,we design a wideband beamformer to fit an array element＇ s weight coefficients in the whole bandwidth in order to realize consistent beam direction and beamwidth. The theoryetical analysis and simulation results show that the method has such advantages as low computational complexity and high robustness.