| 雷波,马远良,杨坤德.有限波束作用下掩埋球体的散射声场计算[J].,2007,26(6):367-374 |
| 有限波束作用下掩埋球体的散射声场计算 |
| Scattering of buried sphere insonified by a finite-beam source |
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| 中文摘要: |
| 计算并分析了海底掩埋物体的三维散射声场。采用"等效垂直线列阵"方法来进行有限波束的建模,并将浅海波导中点声源散射声场的波数积分计算方法,推广到有限波束作用下海底掩埋物体的散射场计算,本文导出了物体位于沉积层中的散射声场计算公式。计算结果表明,在波导中垂直面内的散射声场,与沉积层中点源形成的声场非常相似;当距离较远时,散射声波呈柱面波衰减。文章还分析利用海面反射以提高散射能量的可能性,表明波束指向性及波束宽度对散射声场有较大影响。 |
| 英文摘要: |
| Calculation and analyses of the 3-D scattering field from a buried soft sphere is addressed.The concept of"equivalent vertical line array directivity pattern"is adopted to generate a finite beam.Based on the spectral approach for scattering in the waveguide, the paper derives a formulation for scattering of buried target insonified by a finite-beam source.Numerical example shows that,the scattering field of the waveguide in a vertical plane is similar to the field radiated from a point source in the sediment,and that the scattered wave behaves like a cylindrical wave at large ranges.The possibility to improve scattering strength by reflects the beam by the sea surface is discussed;it is shown that the beam directivity and beam width have great impact on the scattering field. |
| DOI：10.11684/j.issn.1000-310X.2007.06.009 |
| 中文关键词: 掩埋物体 散射 有限波束 波数积分 |
| 英文关键词: Buried target Scattering Finite-beam Wavenumber integration |
| 基金项目:西北工业大学研究生创业种子基金;西北工业大学青年科技创新基金;;声场声信息国家重点实验室基金 |
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