北京航空航天大学学报 ›› 2016, Vol. 42 ›› Issue (12): 2632-2639.doi: 10.13700/j.bh.1001-5965.2016.0442

• 论文 • 上一篇    下一篇

高精度法矢下切割面自适应的凸曲面射线寻迹

李尧尧, 苏东林, 刘焱, 杨照   

  1. 北京航空航天大学 电子信息工程学院, 北京 100083
  • 收稿日期:2016-05-23 出版日期:2016-12-20 发布日期:2016-09-12
  • 通讯作者: 苏东林,Tel.:010-82317224,E-mail:sdl@buaa.edu.cn E-mail:sdl@buaa.edu.cn
  • 作者简介:李尧尧,男,博士。主要研究方向:系统级电磁兼容设计、电磁兼容与电磁环境。E-mail:bravegoal@126.com;苏东林,女,博士,教授,博士生导师。主要研究方向:电磁兼容、电磁环境效应、计算电磁学、射频微波电路与系统和新型飞行器机载共形/共用/小型化天线等。Tel.:010-82317224,E-mail:sdl@buaa.edu.cn;刘焱,男,博士。主要研究方向:系统级电磁兼容设计、电磁兼容与电磁环境。E-mail:b10093@buaa.edu.cn;杨照,男,博士。主要研究方向:电磁兼容与电磁环境。E-mail:241172284@qq.com
  • 基金资助:
    国家自然科学基金(61427803)

Convex surface ray tracing based on adaptive cutting surface adjustment under exact normal vector

LI Yaoyao, SU Donglin, LIU Yan, YANG Zhao   

  1. School of Electronic and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2016-05-23 Online:2016-12-20 Published:2016-09-12
  • Supported by:
    National Natural Science Foundation of China (61427803)

摘要: 针对电大尺寸目标难以精确解析表达带来的一致性几何绕射算法应用难问题,提出了基于三角网格、适用于任意凸曲面的射线寻迹(TM-tracing)算法。应用工程中较易获取的三角网格及其协议,设计了一种满足快速多边搜索条件的网状数据存储链表;提出了满足寻迹要求的高精度法矢求解算法;采用切割面自适应调整的弧形拟合寻迹方法实现了爬行波寻迹算法;结合一致性几何绕射理论(UTD)实现了暗区场值求解算法。任意网格曲面射线寻迹结果表明:本文提出的寻迹算法适用于包括球、柱和锥在内的任意光滑凸曲面,寻迹偏差小于1.61%,寻迹速度为2.8 s,具有一定的工程应用价值。

关键词: 三角网格, 一致性几何绕射理论(UTD), 射线寻迹, 短程线, 爬行波

Abstract: Electrical large targets are difficult to be accurately and analytically expressed and thus it is difficult to use uniform geometrical theory of diffraction (UTD) method for field computation. Aimed at this problem, a novel creeping ray triangular mesh tracing (TM-tracing) algorithm for arbitrary convex surface was proposed. Based on practical engineering triangular mesh and its protocol, a net-like triangular mesh data storage list which meets the rapid multilateral search criteria was designed. A high accuracy normal vector algorithm was proposed to satisfy the tracing requirement. Then a dynamic adjustment of the arc cutting surface fitting tracing method was proposed to realize creeping wave tracing algorithm. Finally, combined with UTD, shadow field value solving algorithm was realized. Aircraft-based ray tracing results show that TM-tracing algorithm can be applied to arbitrary smooth convex surfaces including sphere, cylinder and cone. Tracing speed is 2.8 seconds and deviation is less than 1.61%. It shows that the proposed algorithm has an application value in engineering.

Key words: triangular mesh, uniform geometrical theory of diffraction (UTD), ray tracing, geodesic, creeping wave

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