Double effects between reflection and edge-diffraction in NURBS-UTD method
Double effects between reflection and edge-diffraction in NURBS-UTD method
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DOI：
10.1080/02726343.2018.1436741
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发表时间：
2018-05
期刊：
影响因子：
0.8
通讯作者：
Nan Wang;Fang-ping Shi;Guiqi Chen;Yu Zhang;C. Liang
中科院分区：
文献类型：
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作者：
Nan Wang;Fang-ping Shi;Guiqi Chen;Yu Zhang;C. Liang
本文研究了均匀几何绕射理论中的二阶射线类型，引入了非均匀有理B-样条法来构造目标。研究了多散射体环境中经常出现的反射边缘绕射射线类型和边缘绕射-反射射线类型。根据费马原理，通过数值优化找到了射线路径。根据单次影响的射线场计算了这类射线所携带的射线场，讨论了它们在总射线场中的贡献。由此可见，在计算辐射方向图时，考虑反射-边缘绕射效应和边缘绕射-反射效应可使计算精度略有提高。数值结果表明了该方法的有效性和改进。
ABSTRACT Second-order ray types in uniform geometrical theory of diffraction method are studied in this paper where non-uniform rational B-spline technique is introduced to construct targets. Reflection-edge diffraction ray type and edge diffraction-reflection ray type which are always appeared in multi-scatterer environments are investigated. Ray paths are found through numerical optimization based on Fermat’s principle. Ray fields carried by these kinds of rays are calculated based on single effected ray fields to discuss their contribution to the total ray fields. It can be seen that the consideration of reflection-edge diffraction effect and edge diffraction-reflection effect can improve the computational precision slightly in calculation of radiation patterns. Numerical results show the validation and the improvement.