基于图形电磁学雷达散射截面计算方法之改进

发布时间：2018-01-22 01:29

本文关键词： 雷达截面积图形电磁学多次反射帧缓存对象离屏渲染　出处：《电子学报》2014年12期 　论文类型：期刊论文

【摘要】：图形电磁学(GRaphical Electromagnetic COmputing,GRECO)利用图形加速卡和Z-Buffer技术可较为有效地解决传统电磁计算方法中存在的消隐困难和非可视化难题,是求解高频电大尺寸目标特性最有效的方法之一.但传统GRECO算法存在着无法精确提取目标法矢信息、计算精度依赖屏幕分辨率和多次反射计算困难等缺点,限制了这种方法的使用.本文针对GRECO方法就精确提取像素几何信息方法进行了简要改进,将其与基于帧缓存对象(FrameBuffer Object,FBO)的离屏渲染技术相结合,提出了改进的GRECO算法,克服了传统GRECO算法无法精确提取像素法矢信息和计算精度依赖屏幕分辨率的缺点.进而,采用AP/PO(Area Projection/Physical Optics)法,并对传统的多次散射面元对判别方法进行了适当改进,实现了对产生多次反射目标的雷达截面计算.
[Abstract]:Graphic electromagnetics Graphical Electromagnetic COmputing. GRECO) using graphics acceleration card and Z-Buffer technology can effectively solve the hidden and non-visual problems in the traditional electromagnetic calculation methods. It is one of the most effective methods to solve the characteristics of high frequency electrically large size target, but the traditional GRECO algorithm can not accurately extract the normal vector information of the target. The accuracy of calculation depends on the screen resolution and the difficulty of calculating multiple reflections, which limits the use of this method. In this paper, the method of accurate extraction of geometric information of pixels is improved briefly for the GRECO method. Combined with the off-screen rendering technology based on frame buffer object (FBO), an improved GRECO algorithm is proposed. It overcomes the shortcoming that the traditional GRECO algorithm can not accurately extract the pixel normal vector information and the calculation accuracy depends on the screen resolution. The method of AP/PO(Area Projection/Physical Optics is adopted, and the traditional multiple scattering surface element method is improved. The radar cross section calculation of multiple reflection targets is realized.
【作者单位】：大连理工大学船舶工程学院;
【基金】：国家自然科学基金(No.51079027)
【分类号】：TN951
【正文快照】： 1引言自西班牙学者J.M.Rius等人[1]于1993年提出“图形电磁计算方法”以来,由于其在求解高频电大尺寸目标散射特性方面无可比拟的优势,而受到人们的青睐.图形电磁算法将传统高频算法和计算机图形学结合起来,通过使用图形显卡的快速消隐功能来获取目标的可见部分,省去了传统高

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