数字宽带波束形成的仿真与验证

Simulation and Test for Digital Broadband Beamforming

提出了宽带恒定束宽响应数字波束形成的整个流程和方法,通过运用数字延时线和Farrow分数延时滤波器相结合的技术对来波信号进行精确的预延时,运用空间重采样法对不同阵元宽带信号各离散频点的加权系数进行了求解,并根据这些加权系数构建了线性相位FIR滤波器来实现该波束形成算法。仿真和分析结果表明整套设计方法正确、实用、有效。

The entire procedure for constructing frequency invariant beamformer has been proposed.Digital delay lines combined with Farrow fractional delay filters are firstly used to precisely pre-delay the impinging signals,then weight coefficients corresponds to different sensors and signal frequencies are derived from the spacial re-sampling methods,a batch of linear phase FIR filters are designed accordingly.Simulation results and analysis prove that the proposed methods are correct and of great utility.