城市环境电磁态势计算中的并行UTD方法

doi:10.19665/j.issn1001-2400.2023.03.016

摘要/Abstract

摘要：

复杂城市环境中的电磁态势预测是无线通信频谱利用、城市系统工程规划以及电磁兼容设计的基本问题,既有工程实用性价值,又具有理论探索价值。计算电磁学中的一致性几何绕射理论方法是分析电大环境电磁问题的有效方法,建立并行策略之后可有效地对城市环境中的电磁态势进行仿真计算和分析。引入了解析六面体模型,使用平面反射、边缘绕射以及与边缘绕射有关的二次绕射、反射-绕射等射线模型来描述电磁波在不可见区域中的传播情况,给出了二次边缘绕射的解析射线寻迹方法。给出计算实例,分别与矩量法计算结果和实际测量结果进行了对比,验证了所述方法的准确性和有效性。为缩短射线寻迹模块的计算时间,提升计算效率并进一步扩展可应用的工程问题计算规模,设计了一种可扩展性较好的并行计算策略,根据射线类型相似性分配计算任务以保证较好的并行计算量均衡。对并行效率和并行加速比进行了讨论,说明了此并行策略的扩展性;与实测结果的对比说明了并行一致性几何绕射理论方法的工程实用性。

关键词: 一致性几何绕射理论, 并行计算, 边缘绕射, 二次绕射, 城市环境电磁态势

Abstract:

Electromagnetic situation prediction in complex city environments is the basic problem in wireless communication spectrum utilization,urban system engineering planning and electromagnetic compatibility design,which is of both engineering practical value and theoretical exploration value.The uniform geometrical theory of diffraction (UTD) in computational electromagnetics is an effective method to analyze electromagnetic problems in electrically large environments,and the electromagnetic situation in urban environment can be simulated and analyzed effectively after building a parallel strategy.By introducing the analytical hexahedron model and using reflection,edge diffraction and its related ray types like double diffraction and reflection-diffraction to describe the propagation of electromagnetic waves in the non-sighted regions,an analyzing and tracing method for double edge diffraction is presented with practical examples given and the validity and accuracy verified by comparison with the results from Moment Methods and from actual measurement,respectively.In order to shorten the calculation time of the ray tracing module,to improve the calculation efficiency and to further expand the calculating scale of an engineering problem that can be applied,a parallel calculation strategy with a better scalability is designed,with which calculation tasks are distributed through the similarity of the ray types to ensure a better balance of parallel calculations.The scalability of this parallel strategy is presented by discussing the parallel efficiency and parallel speedup ratio.The engineering practicality of the parallel UTD method in this paper is shown through comparison with the actual measurement results.

Key words: uniform geometrical theory of diffraction, parallel calculation, edge diffraction, double diffraction, electromagnetic situation in city environments

中图分类号:

TN82

王楠,陈贵齐,赵延安,张玉. 城市环境电磁态势计算中的并行UTD方法[J]. 西安电子科技大学学报, 2023, 50(3): 171-181.

WANG Nan,CHEN Guiqi,ZHAO Yanan,ZHANG Yu. Parallel UTD method for calculation of electromagnetic problems in city environments[J]. Journal of Xidian University, 2023, 50(3): 171-181.

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