基于自适应射线管分裂的多次反射计算方法  

Efficient multi-reflection computational method based on adaptive ray tube splitting

作　　者：殷红成[1,2] 朱国庆 董纯柱[1,2] 王超 

机构地区：[1]电磁散射重点实验室,北京100854 [2]中国传媒大学信息工程学院,北京100024

出　　处：《系统工程与电子技术》2013年第4期700-706,共7页Systems Engineering and Electronics

摘　　要：传统弹跳射线(shooting and bouncing rays,SBR)方法采取按均匀射线管的方式进行射线追踪,因此,在计算电大尺寸复杂目标多次反射时,需要处理海量射线,计算效率极低,应用上受到很大限制。提出了一种基于复杂目标不规则三角网(triangle irregular network,TIN)模型的自适应射线管分裂算法(adaptive ray tubesplitting algorithm,ARTSA),利用TIN模型信息动态生成非均匀初始射线管,经过与模型三角面元的求交、多边形裁剪和三角化处理,将初始射线管自适应分裂成多个子射线管,利用口面积分(aperture integral,AI)法计算各子射线管的多次反射场,通过相干叠加获得目标多次反射贡献。与传统SBR方法相比,在相同计算精度下,所提算法能极大地减少射线追踪数量,显著提高计算电大尺寸复杂目标多次反射的效率。The traditional shooting and bouncing rays （SBR） technique usually utilizes the small uniform ray tube for ray tracing, where a great number of rays need to be dealt with while calculating the multiple reflec tions for electrically large complex targets, therefore, the calculation efficiency is greatly reduced to restrict the applications. A novel adaptive ray tube splitting algorithm （ARTSA） based on the complex target＇s triangle ir regular network （TIN） model is presented. Firstly, the information of TIN model is used to generate non uni- form optimized initial ray tubes dynamically. After making the ray tube intersection, polygon clipping and trian gularization operation, each initial ray tube is split to a certain number of sub ray tubes. Eventually, the multi reflection contributions of complex objects are gained via the coherent superposition of all sub ray tube contribu- tions calculated by aperture integral （AI）. Compared with the traditional SBR technique, the proposed algo- rithm could reduce the number of rays greatly and enhance the efficiency of multi-reflection calculation observ ably with the same calculation precision.

关 键 词：电磁散射 多次反射 弹跳射线法 多边形裁剪 

分 类 号：O441[理学—电磁学]