| 水下复杂形状目标回声的过渡特性 |
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| 引用本文： | 范军,李建鲁,刘涛,汤渭霖.水下复杂形状目标回声的过渡特性[J].上海交通大学学报,2002,36(2):161-164. |
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| 作者姓名： | 范军 李建鲁 刘涛 汤渭霖 |
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| 作者单位： | 上海交通大学,振动、冲击、噪声国家重点实验室,上海,200030 |
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| 摘 要： | 对水下复杂目标进行多个子目标积木式建模，利用近场板块元方法研究目标近场，远场的过渡规律，并运用了目标相互干涉理论，对复杂目标近场回声强度出现的干涉现象进行了物理解释，获得了频率为3kHz和5kHz的平面波正横入射和斜入射水下复杂目标时，回声强度随距离变化的规律，与简单形状目标相比，复杂目标的回声强度随频率和距离的变化更为复杂。
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| 关 键 词： | 水下复杂形状目标 回声 过滤特性 近场 远场 声纳 |
| 文章编号： | 1006-2467(2002)02-0161-04 |
| 修稿时间： | 2001年3月12日 |
Transition Characteristics of Echoes from Complex Shape Targets in Water |
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| FAN Jun,LI Jian lu,LIU Tao,TANG Wei lin.Transition Characteristics of Echoes from Complex Shape Targets in Water[J].Journal of Shanghai Jiaotong University,2002,36(2):161-164. |
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| Authors: | FAN Jun LI Jian lu LIU Tao TANG Wei lin |
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| Abstract: | The near field echo characteristics of the complex shape targets were investigated. The complex shape targets were modeled with several simple shape sub targets. The near field planar element method was applied for the complex shape targets to calculate the transition characteristics from near field to far field. The interference phenomena of the near field echoes from the complex shape targets was explained using the sub targets interference theory. Numerical results of echo strength at frequency 3 kHz and 5 kHz were obtained in the case of the plane wave normal incidence and oblique incidence. By comparison with simple shape targets, the echo strength of the complex targets versus frequency and range is more complex. |
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| Keywords: | complex targets near field far field echo strength |
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