基于点云重建复杂城市建筑环境的电磁计算  

Electromagnetic calculation of complex urban architectual environment based on point cloud reconstruction

作　　者：李玉峰 周晨[1] 张富彬 夏国臻 朱建桦 LI Yufeng;ZHOU Chen;ZHANG Fubin;XIA Guozhen;ZHU Jianhua(School of Electronic Information,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电子信息学院,武汉430072

出　　处：《电波科学学报》2022年第4期678-686,共9页Chinese Journal of Radio Science

摘　　要：在现代城市环境中,地形地貌地物复杂,精确评估电波传播效应十分困难.针对传统城市建筑环境电磁计算物理建模不够精确的问题,提出利用多视角立体视觉的方法对城市复杂建筑环境进行基于点云的三维重建,获取精确的三角网格模型,并通过机器学习图像分割的方法获取城市环境边界电磁属性;在此基础上进行基于一致性绕射理论的射线追踪电磁计算,从而获取厦门大学翔安校区的电磁态势分布.通过在不同分辨率网格模型上计算,并与COST231-Hata模型和实际测量结果对比,高分辨率网格模型的均方根误差为6.0655 dB,证明了本文建模及计算方法的有效性.In a complex city environment,it is very difficult to accurately evaluate the effect of radio wave propagation due to the complex terrain,landforms and features.In order to solve the problem that the traditional physical modeling of electromagnetic computing in urban architectual environment is not accurate enough,this paper proposes a multi-view stereo method to reconstruct the complex urban architectual environment based on point cloud,obtain the accurate triangular mesh model,and obtain the electromagnetic attributes of urban environment boundary by machine learning image segmentation method.On this basis,the ray tracing electromagnetic calculation based on uniform theory of diffraction is carried out to obtain the electromagnetic situation distribution in Xiang’an campus of Xiamen University.By calculating on different resolution grid models,and comparing with the COST231-Hata model and actual measurement results,the root mean square error of the high-resolution grid model is 6.0655 dB,which proves the effectiveness of the modeling and calculation methods in this paper.

关 键 词：复杂环境 点云 表面重建 射线追踪 一致性绕射理论 电磁态势 

分 类 号：TN011[电子电信—物理电子学] TN821