一种用于声学成像的稳健宽带恒定束宽波束形成方法

基于聚焦变换思想的波束形成是一种有效的恒定束宽波束形成方法.然而,当信号的方向信息存在误差时,聚焦变换波束形成方法的稳健性会急剧下降,为了克服这种缺点,将稳健Capon波束形成(RCB)思想用于聚焦变换方法中,提出一种稳健宽带恒定束宽波束形成方法并将其应用于声学成像.该方法通过RCB校正信号方向信息得到较为准确的聚焦矩阵,从而减少聚焦数据误差,避免估计畸变,提高了基于聚焦变换思想恒定束宽波束形成器的性能.

A robust wideband constant-beamwidth beamforming method for acoustic imaging

The focused beamformer is an efficient broadband beamforming method because of the advantages of the ability to operate in multipath environments and computational efficiency.However,the robustness of the focused beamformer is not good enough when the error of signal direction exists.To overcome the shortcoming,a novel robust broadband beamforming method based on the focusing approach is presented in this paper to achieve a constant beamwidth for acoustic imaging.The proposed method mainly applies the idea of Robust Capon Beamforming(RCB) to the focusing approach to get the more exact focusing transformation matrix and then reduce the focused data error.Thus it can greatly improve the robustness performance of the focused beamformer.