A simulation method on target strength and circular SAS imaging of Xrudder UUV including multiple acoustic scattering  

作　　者：Wenhuan Wang Bin Wang Jun Fan Fulin Zhou Kaiqi Zhao Zhou Jiang 

机构地区：[1]School of Naval Architecture,Ocean&Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,PR China [2]Key Laboratory of Marine Intelligent Equipment and System of Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,PR China [3]Shanghai Acoustics Laboratory,Chinese Academy of Sciences,Shanghai 200240,PR China

出　　处：《Defence Technology（防务技术）》2023年第5期214-228,共15页Defence Technology

基　　金：supported by the National Youth Science Foundation of China(Grant No.52001211).

摘　　要：Target strength(TS)and circular synthetic aperture sonar(CSAS)images provide essential information for active acoustic detection and recognition of non-cooperative unmanned undersea vehicles(UUVs),which pose a significant threat to underwater preset facilities.To access them,we propose an iterative physical acoustics(IPA)-based method to simulate the multiple acoustic scattered fields on rigid surfaces in high-frequency cases.It uses the Helmholtz integral equation with an appropriate Green's function in terms of the Neumann series,and then incorporates the ideas of triangulation and iteration into a numerical implementation.Then two approximate analytic formulae with precise physical meanings are derived to predict the TS and CSAS images of concave targets,respectively.There are no restrictions on the surface's curvature and the order of multiple scattering.The method is validated against the finite element method(FEM)for acoustic scattering from a sphere segment and against an experiment involving an X-rudder UUV's stern.On this basis,we simulate and analyze the TS and CSAS images of an X-rudder UUV.In addition,the influence of the angle of adjacent rudders on the multiple scattering characteristics is discussed.Results show that this method can potentially predict accurate UUV features,especially the multiple scattered features.

关 键 词：Multiple acoustic scattering Target strength(TS) Circular synthetic aperture sonar(CSAS) X-rudder unmanned undersea vehicle (UUV) Iterative physical acoustics(IPA) 

分 类 号：U666.7[交通运输工程—船舶及航道工程] U674.941[交通运输工程—船舶与海洋工程]