复合目标电磁散射高频方法研究
发布时间：2018-12-17 18:43
【摘要】：近年来与随机粗糙面相关的应用越来越多,因此与它相关的电磁散射特性问题的研究受到了大量研究人员广泛而全面的关注,特别是关于它与三维散射体构成的复合目标的雷达散射截面(RCS)的计算更是成为了电磁计算领域中的重点、难点和热点问题,对人们的日常生产生活有着举足轻重的作用和巨大的影响。但是由于复合目标通常比较复杂,要对其进行仿真计算,需要对算法的适用范围、计算效率和内存消耗等提出很严苛的要求,而现有的多数算法都受限于自身的适用范围和计算效率不能有效地计算复合目标的散射问题。鉴于弹跳射线法(Shooting and Bounce Rays)具有使用范围广、计算效率高并且能求解出具有较高精度结果等优点,因此本文采用SBR来求解复合目标的电磁散射特性问题。本文的研究工作如下:1.本文首先对研究随机粗糙面电磁散射问题的历史进行了回顾并对相应的计算方法进行了介绍,总结出了它们的应用范围和优缺点。并结合随机粗糙面自身具有的各种特征和属性,因此决定将SBR作为本文对其电磁散射问题研究的重点内容;2.由于复合目标的外形特征较为复杂,当用平面三角面元对其离散时,会丢失掉全部的关于表面的曲率信息,从而使SBR的计算精度下降,以至于在求解包含有凹面结构的散射体时会给出错误的结果。对此本文引进了虚拟发散因子(Virtual Divergence Factor,VDF),可以修正曲率信息的丢失,从而保证了SBR的计算精度。同时又由于复合目标往往为电大尺寸目标,因而用来离散其的三角面元数目较多,因此本文又引进了Kd-tree数据结构traverse,ART)法来加速对Kd-tree的遍历,从而大大提高了SBR的计算效率;3.用改进后的SBR计算大量典型目标的雷达散射截面(RCS),该结果与数值方法求解的结果和测量结果吻合的很好,充分证明了SBR具有广泛的使用范围、卓越的计算效率和良好的计算精度。最后本文成功将该方法用于随机海面分别与导弹和舰船组成的复合目标RCS的仿真计算。
[Abstract]:In recent years, there are more and more applications related to random rough surfaces, so the study of electromagnetic scattering characteristics related to random rough surfaces has attracted extensive and comprehensive attention of a large number of researchers. In particular, the calculation of radar cross section (RCS) of a composite target composed of three dimensional scattering objects has become an important, difficult and hot issue in the field of electromagnetic calculation. It plays an important role in people's daily production and life. However, due to the complexity of complex targets, it is necessary to make strict demands on the application range, computational efficiency and memory consumption of the algorithm in order to simulate it. However, most of the existing algorithms are limited by their scope of application and computational efficiency can not effectively calculate the scattering problem of composite targets. Because the bouncing ray method (Shooting and Bounce Rays) has the advantages of wide range of application, high computational efficiency and high accuracy, SBR is used to solve the electromagnetic scattering problem of composite targets. The research work of this paper is as follows: 1. In this paper, the history of the study on electromagnetic scattering from random rough surfaces is reviewed, and the corresponding calculation methods are introduced, and their application scope, advantages and disadvantages are summarized. Combined with the characteristics and attributes of random rough surface, it is decided that SBR is the focus of the study of electromagnetic scattering in this paper. 2. Due to the complexity of the shape characteristics of the composite target, the curvature information of the surface will be lost when it is dispersed by the plane triangular plane, thus the accuracy of the SBR calculation will be reduced. So that the solution of scattering body with concave structure will give the wrong results. In this paper, a virtual divergence factor (Virtual Divergence Factor,VDF) is introduced, which can correct the loss of curvature information and ensure the accuracy of SBR calculation. At the same time, because the composite targets are often electrically large, so there are a lot of triangular planes used to discretize them, so the Kd-tree data structure (traverse,ART) method is introduced to speed up the traversal of Kd-tree. Thus, the computational efficiency of SBR is greatly improved. 3. The improved SBR is used to calculate the radar cross section (RCS),) of a large number of typical targets. The results are in good agreement with the results obtained by the numerical method and the measured results. It is fully proved that the SBR has a wide range of applications. Excellent calculation efficiency and good accuracy. Finally, this method is successfully applied to the simulation of the composite target RCS composed of random sea surface and missile and ship respectively.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN011
本文编号：2384641
[Abstract]:In recent years, there are more and more applications related to random rough surfaces, so the study of electromagnetic scattering characteristics related to random rough surfaces has attracted extensive and comprehensive attention of a large number of researchers. In particular, the calculation of radar cross section (RCS) of a composite target composed of three dimensional scattering objects has become an important, difficult and hot issue in the field of electromagnetic calculation. It plays an important role in people's daily production and life. However, due to the complexity of complex targets, it is necessary to make strict demands on the application range, computational efficiency and memory consumption of the algorithm in order to simulate it. However, most of the existing algorithms are limited by their scope of application and computational efficiency can not effectively calculate the scattering problem of composite targets. Because the bouncing ray method (Shooting and Bounce Rays) has the advantages of wide range of application, high computational efficiency and high accuracy, SBR is used to solve the electromagnetic scattering problem of composite targets. The research work of this paper is as follows: 1. In this paper, the history of the study on electromagnetic scattering from random rough surfaces is reviewed, and the corresponding calculation methods are introduced, and their application scope, advantages and disadvantages are summarized. Combined with the characteristics and attributes of random rough surface, it is decided that SBR is the focus of the study of electromagnetic scattering in this paper. 2. Due to the complexity of the shape characteristics of the composite target, the curvature information of the surface will be lost when it is dispersed by the plane triangular plane, thus the accuracy of the SBR calculation will be reduced. So that the solution of scattering body with concave structure will give the wrong results. In this paper, a virtual divergence factor (Virtual Divergence Factor,VDF) is introduced, which can correct the loss of curvature information and ensure the accuracy of SBR calculation. At the same time, because the composite targets are often electrically large, so there are a lot of triangular planes used to discretize them, so the Kd-tree data structure (traverse,ART) method is introduced to speed up the traversal of Kd-tree. Thus, the computational efficiency of SBR is greatly improved. 3. The improved SBR is used to calculate the radar cross section (RCS),) of a large number of typical targets. The results are in good agreement with the results obtained by the numerical method and the measured results. It is fully proved that the SBR has a wide range of applications. Excellent calculation efficiency and good accuracy. Finally, this method is successfully applied to the simulation of the composite target RCS composed of random sea surface and missile and ship respectively.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN011
【参考文献】
相关期刊论文 前2条
1 夏明耀,伍振兴;基于单积分方程矩量法的海洋表面微波散射模拟[J];电子学报;2005年03期
2 郭立新,徐燕,吴振森;分形粗糙海面高斯波束散射特性模拟[J];电子学报;2005年03期
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