浅海波导中刚性球声散射特性研究

目标特性研究对军事及海洋开发具有重要意义。作者用Ingenito的简正波方法对浅海波导中刚性球的散射进行了理论研究。在理论推导中直接利用波导中简正波解，同时去掉文F．Izngenito等研究中的远场假设，使理论结果更具一般性。文中对浅海波导中刚性球的散射进行了数值计算，并进行了分析。结果表明，浅海波导中目标散射场特性与自由场中明显不同，海底、海面的存在使散射场在深度方向产生干涉，从而影响散射场的空间分布，海底声速及衰减系数对散射场空间分布有重要影响。

Studies on Scattering from a Rigid Sphere in a Shallow Water Wave-Guide

The study of characteristics is of significance in both military affairs and ocean development. Sound scattering from a rigid sphere in a shallow water wave-guide is studied theoretically in this paper. The scattering field is obtained using the Ingenito normal mode method. In deriving the normal mode expressions, mode amplitude functions are directly used, meanwhile the far field assumption is removed. Thus the theory is more applicable. The numerical simulation of the scattering field of a rigid sphere in the wave-guide is conducted, the characteristics of the field are analyzed. The results show that the difference between the scattering field in a wave-guide and that in free space is remarkable, the existence of the sea surface and the bottom causes interference in the vertical direction. The sound speed and attenuation coefficient in the sea bottom affect the distribution of the scattering field significantly.