提出了一种波束宽度不随频率变化的波束形成方法。该方法只需要使用一个真实阵列,通过变换产生多个虚拟阵列的输出,每个虚拟阵列都与参考波束相近。该方法简单且易于实现,只需用传统的窄带阵列设计方法在参考频率下设计基阵来满足对波束图的要求。仿真结果证明了方法的有效性。
A new method of implementing frequency invariant beamformers based on Bessel function is presented. The virtual array output is formed from the sensor array by transformation. The beamformers of every frequency bins in the bandwidth of the signal is similar to that of the referenced frequency. The method is simple and easy to implement. Simulation results demonstrate the effectiveness of the method.