| 浅海波导中目标散射的简正波-Kirchhoff近似混合方法 |
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| 引用本文： | 范威, 范军, 陈燕. 浅海波导中目标散射的简正波-Kirchhoff近似混合方法[J]. 声学学报, 2012, 37(5): 475-483. DOI: 10.15949/j.cnki.0371-0025.2012.05.003 |
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| 作者姓名： | 范威 范军 陈燕 |
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| 作者单位： | 1.上海交通大学 海洋工程国家重点实验室 上海 200240 |
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| 摘 要： | 提出了计算浅海波导中复杂目标散射的数值方法:简正波-Kirchhoff近似混合方法。通过把目标散射的Kirchhoff近似方法和简正波声传播模型相结合,可对大尺寸复杂目标在浅海波导中的散射声场进行计算。以浅海波导中刚性球体散射的解析解为标准解验证了本方法,说明简正波-Kirchhoff近似混合方法是有一定计算精度的工程预报方法。数值计算Pekeris浅海波导中球体目标散射声场在深度-频率平面和距离-频率平面上的二维干涉结构及其与自由空间中的差异。进而通过FFT获得目标时域回波随深度的分布图,分析浅海波导中目标姿态、声速剖面对Benchmark潜艇目标散射的影响。
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| 收稿时间： | 2011-06-27 |
| 修稿时间： | 2011-10-10 |
A hybrid normal modes/Kirchhoff approximation method for target scattering in shallow water waveguide |
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| FAN Wei, FAN Jun, CHEN Yan. A hybrid normal modes/Kirchhoff approximation method for target scattering in shallow water waveguide[J]. ACTA ACUSTICA, 2012, 37(5): 475-483. DOI: 10.15949/j.cnki.0371-0025.2012.05.003 |
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| Authors: | FAN Wei FAN Jun CHEN Yan |
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| Affiliation: | 1.State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University Shanghai 200240 |
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| Abstract: | A numerical hybrid normal modes/Kirchhoff approximation method is brought forward to predict the acoustic scattering pressure for large complex target in shallow water waveguide. This study uses the Kirchhoff approximation approach and normal modes model to calculate target scattering function and acoustic propagation respectively. The present numerical method is validated by analytical benchmark solution for rigid sphere scattering in an ideal shallow water waveguide and it has been proved to be an accurate engineering prediction method. Interference structure of scattering pressure for a rigid sphere in Pekeris shallow water waveguide in the range-frequency domain and the depthfrequency domain are numerical analyzed and compared with free space situation. Echo in the time domain is obtained by FFT and then the effects of target posture and sound velocity profile on echo from Benchmark submarine target are discussed. |
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