水下高阶声场宽带信号最优检测后处理方法  

An Optimal Post Processing Detection Method for Underwater Broadband Signals of High-Order Sound Field

作　　者：王强[1] 吴玺宏[1] 潘悦 高山[1] WANG Qiang;WU Xihong;PAN Yue;GAO Shan(School of Intelligence Science and Technology,Peking University,Beijing 100871;Applied Acoustics Research Institute,Hangzhou 310012)

机构地区：[1]北京大学智能学院,北京100871 [2]杭州应用声学研究所,杭州310012

出　　处：《北京大学学报（自然科学版）》2024年第6期1009-1014,共6页Acta Scientiarum Naturalium Universitatis Pekinensis

摘　　要：针对小孔径传感器在实际多干扰目标条件下分辨能力弱、应用难的问题,提出一种高阶声场分阶的宽带信号最优检测后处理方法。利用典型噪声场在高阶声场各阶信号不相关的特性,通过分阶波束形成,对波束内信号功率以及噪声功率进行估计,根据各子带信噪比构建最优检测滤波器。通过千岛湖湖上实测数据验证,该方法的检测性能可以在原有HOA-MVDR方法的基础上提高2~7.5dB,并且能够提高强目标干扰条件下的多目标分辨能力。According to the weak resolution of small aperture high-order acoustic field sensors under actual multi-target interference conditions in marine environment,a broadband signal optimal detection based on the subset of high-order sound field domain post-processing method is proposed.This method utilizes the characteristic of typical noise fields that signals in different orders of the high-order sound field are decorrelation.The signal power and noise power within one beam are estimated through the subset of high-order acoustic signals with MVDR.An optimal beam domain detection filter based on the signal-to-noise ratio of each subband is constructed.This method is verified through multiple measured dataset on Qiandao Lake.The detection capability is improved by 2-7.5 dB compared with the original method,and the multi-target resolution capability under strong target interference is significantly improved.

关 键 词：高阶声场传感器 波束形成 最优后处理 目标探测 

分 类 号：TB56[交通运输工程—水声工程]