水下目标宽带回波特性的快速计算方法

发布时间：2018-02-28 14:48

本文关键词： 板块元散射声场切比雪夫多项式宽带回波特性　出处：《上海交通大学学报》2017年02期 　论文类型：期刊论文

【摘要】：基于传统板块元方法,运用切比雪夫多项式插值实现了水下目标宽带回波特性的快速计算.从散射声场的特性出发,将幅相分离的思想引入散射声场的分析.目标表面单个板块散射声场可分解为随频率变化的快速起伏和缓变函数的乘积,提取缓变函数切比雪夫节点处的板块散射声场,再利用切比雪夫逼近理论插值得到宽频带内各频率点处的精密计算.结合分离出的随频率快速起伏项,获取每个板块的宽带散射声场,通过各板块元散射声场叠加得到目标宽带回波特性.该方法避免了传统板块元算法逐频率点计算所带来的大量板块的重复计算,可以快速、精确计算水下目标宽带回波特性,计算效率大为提高.
[Abstract]:Based on the traditional plate element method and Chebyshev polynomial interpolation, the fast calculation of broadband echo characteristics of underwater target is realized. The idea of amplitude-phase separation is introduced into the analysis of scattering sound field. The scattering sound field of a single plate on the target surface can be decomposed into the product of the fast fluctuation with frequency and the product of the slowly varying function, and the scattering sound field of the plate at the Chebyshev node of the slowly varying function can be extracted. Using Chebyshev approximation theory, the precise calculation of each frequency point in the wide band is obtained. The broadband scattering sound field of each plate is obtained by combining the separated fast fluctuation term with the frequency. The wideband echo characteristics of the target are obtained by the superposition of the scattering sound fields of each plate element. This method avoids the repeated calculation of a large number of plates brought by the traditional plate element algorithm by frequency point calculation, and can quickly and accurately calculate the broadband echo characteristics of underwater targets. The calculation efficiency is greatly improved.
【作者单位】：上海交通大学高新船舶与深海开发装备协同创新中心海洋工程国家重点实验室;广东海洋大学信息学院;
【基金】：青年科学基金项目(11504233)资助
【分类号】：TB56

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