| 浅海环境中水下物体声目标强度的物理意义 |
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| 引用本文： | 张波. 浅海环境中水下物体声目标强度的物理意义[J]. 中国科学(G辑), 2013, 0(3): 239-248 |
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| 作者姓名： | 张波 |
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| 作者单位： | [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 |
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| 基金项目： | 装备预先研究基金资助项目（编号：51303030408） |
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| 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.
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| 关 键 词： | 浅海 平均测量法 散射 声目标强度 |
Discussion on the physical significance of the acoustic target strength of an underwater object in shallow water |
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| ZHANG Bo. Discussion on the physical significance of the acoustic target strength of an underwater object in shallow water[J]. , 2013, 0(3): 239-248 |
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| Authors: | ZHANG Bo |
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| Affiliation: | ZHANG Bo 1 Science and Technology on Underwater Test and Control Laboratory, Dalian 116013, China; 2 University of Chinese Academy of Sciences, Beijing 100190, China; State Key Laboratory of Acoustics; Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | 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. |
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| Keywords: | shallow water average-measurement method scattering acoustic target strength |
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