浅海环境中水下物体声目标强度的物理意义  

Discussion on the physical significance of the acoustic target strength of an underwater object in shallow water

作　　者：张波[1,2,3] 

机构地区：[1]水下测控技术重点实验室,大连116013 [2]中国科学院大学,北京100190 [3]中国科学院声学研究所声场声信息国家重点实验室,北京100190

出　　处：《中国科学：物理学、力学、天文学》2013年第3期239-248,共10页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：装备预先研究基金资助项目(编号:51303030408)

摘　　要：根据简正波理论,推导了基于平均测量法的浅海环境中水下物体声目标强度TS(Target Strength)的解析表达式,深入分析了TS的物理意义.分析表明,在确定的方位角上,TS与分布在一定范围内的垂直入射角i和散射角s所对应的目标散射函数值有关,i和i是离散的,其取值取决于简正波阶数;同时,TS还跟海洋环境和测试距离有关,当测试距离非常大时,约等于自由场声目标强度TSfree.Utilizing normal mode theory, the analytical formula of the TS of an underwater object in shallow water is derived, based on the average-measurement method, and its physical significance is analyzed in depth. Analysis shows that, as for as a certain azimuth, TS is dependent on the target scattering function values at a few vertical incident angles, θm, and scattering angles,θn. θm and θm are discrete, their values depending on normal-mode order, m, n. Furthermore, TS is concerned with both the marine environment and the testing range, and it is approximately equal to the free-field target strength, TSfree, when the testing range is large enough.

关 键 词：浅海 平均测量法 散射 声目标强度 

分 类 号：O422[理学—声学]