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射线追踪法计算含腔目标的电磁散射

发布时间:2018-05-07 19:38

  本文选题:快速射线追踪算法 + 腔体电磁散射 ; 参考:《南京邮电大学》2017年硕士论文


【摘要】:随着国家大力投入国产大飞机项目,大型飞机的散射特性的研究越来越重要。飞机的进气口(腔体形状)产生的散射是飞机散射的重要组成部分。传统的低频电磁数值计算方法虽然可以准确的求解目标物体的散射,但随着尺寸增大会占用巨大的计算机资源且计算速度较慢。而高频算法可以快速的求解,节约计算机资源,实现快速计算。本文对开口腔体结构的散射的原理及计算进行了展开与讨论。基于射线追踪(Ray Tracing Algorithm)的弹跳射线算法(SBR)是计算腔体RCS的一种高频方法,特点是物理概念简单,易于编程实现。该算法是几何光学(GO)与电磁场面等效原理的结合,能计算得到较精确结果。首先,本文分析射线追踪的基本方法,从射线发射,路径计算,以及射线接收都进行了详细讨论。传统射线追踪都无法避免大规模的线面求交运算,这部分运算耗时巨大。针对这一问题,本文采用了一种基于空间剖分射线追踪算法。与传统加速算法类似的都是对传播空间进行分割。不同之处在于,新方法将传播空间分割成若干个相互独立的三角形单元(二维空间)或者四面体单元(三维空间),利用射线与剖分单元的几何位置关系,快速计算射线传播路径,完全避免进行相交测试,很适合复杂环境条件下的射线传播预测。其次,把基于空间剖分射线追踪算法引入弹跳射线法(SBR)计算腔体散射的计算中。新射线追踪算法可以快速跟踪射线路径和场强。同时改进了矩形腔体射线的接收方法,快速得到腔体腔体口径面的场强分布。再利用电磁场等效原理,利用口径表面电磁和磁流求解远区散射场。此外本文改进了三维情况下的散射计算公式。
[Abstract]:The study of scattering characteristics of large aircraft is becoming more and more important with the national investment in large aircraft projects. The scattering from the air inlet (cavity shape) is an important part of the aircraft scattering. Although the traditional low-frequency electromagnetic numerical method can accurately solve the scattering of the target object, with the increase of the size, it will take up huge computer resources and the calculation speed is relatively slow. The high-frequency algorithm can be solved quickly, save computer resources and realize fast calculation. In this paper, the scattering principle and calculation of open cavity structure are discussed. The bouncing ray algorithm based on ray tracing Tracing algorithm is a high frequency method for calculating cavity RCS, which is characterized by simple physical concept and easy programming. The algorithm is a combination of geometric optics (GOG) and the equivalent principle of electromagnetic field surface, and can obtain more accurate results. Firstly, the basic methods of ray tracing are analyzed, and the ray emission, path calculation and ray receiving are discussed in detail. Traditional ray tracing can not avoid large-scale line-surface intersection, which takes a lot of time. In order to solve this problem, a space-based ray tracing algorithm is proposed in this paper. Similar to the traditional acceleration algorithm, the propagation space is segmented. The difference is that the new method divides the propagation space into several independent triangular elements (two-dimensional space) or tetrahedral elements (three-dimensional space), using the geometric position relationship between ray and subdivision element. The ray propagation path is calculated quickly and the intersecting test is avoided completely. It is very suitable for ray propagation prediction under complex environment. Secondly, the space split ray tracing algorithm is introduced into the calculation of cavity scattering by bouncing ray method (SBR). The new ray tracing algorithm can quickly track the ray path and field strength. At the same time, the radiation receiving method of rectangular cavity is improved, and the field intensity distribution of cavity aperture surface is obtained quickly. Based on the equivalent principle of electromagnetic field, the scattering field in the far region is solved by using the aperture surface electromagnetic and magnetic current. In addition, this paper improves the calculation formula of scattering in three dimensional case.
【学位授予单位】:南京邮电大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TN011

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