摘要
水下目标探测和识别的前提是对目标及其散射特性有良好的先验知识。研究目标的散射特性可以为水声主动探测和目标识别提供理论基础和技术支持。本文研究了平面波入射情况下无限大均匀介质中的球形目标散射函数求解问题。利用入射平面波的球函数展开形式和不同性状(刚性、软性)目标球表面的边界条件,推导得到了球形目标在球坐标和柱坐标系下的散射函数解析式,并进行了数值仿真。计算结果表明,自由场条件下,不同ka和性状的球形目标散射强度随方位角呈不同特性分布。
The precondition for detection and classification of the underwater target is having a good acquaintance to the target and its scattering characteristics. The study on the scattering characteristics of an underwater target is not only the theory base but also the technical support for the hydro-acoustics active detection and classification. In this paper, calculation of scattering function of spherical target with plane- wave ineidencing in an infinity homogenous medium is studied. By decomposing the spherical function of the incident plane-wave and combining with the respective surface boundary conditions of the different（ rigid or soft）sphere-targets,expressions of the spherical target＇s scattering function are separately derived under the spherical and cylindrical coordinate systems. Numerical calculations are presented, and the results show that the scattering field of the sphere-target in free space has a characteristic angular distribution versus different ka and target property.
出处
《舰船科学技术》
2009年第9期128-131,共4页
Ship Science and Technology
基金
海军"十一五"装备预研项目资助(4010703010102)
关键词
散射函数
平面波
边界条件
水声探测
scattering function
plane-wave
boundary condition
hydroacoustic detection
