一种结合数字高程地图的射线跟踪建模方法
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摘要
为了解决不同格式的数字地图之间不能进行数据共享的问题,在阐述传统数字地图和数字高程地图的建模思想及数据存储格式后,通过流程图给出了它们之间相互转换的算法,并利用仿真实例验证了转换算法的可行性和正确性,进而分析了在格式转换时数字高程地图的分辨率对各建筑物顶点误差的影响.此外,将数字高程地图作为三维射线跟踪模型的输入,对垂直极化的偶极子天线进行了仿真,并直观地给出了功率覆盖的预测结果,扩展了射线跟踪模型的适用范围,为城市微小区场景下的电波传播特性研究提供了新的思路.
In order to solve the problem of data sharing between different formats of a digital map,this paper introduces the modeling ideas and storage formats of the traditional digital map and digital elevation model(DEM),on the basis of which the algorithms for conversion between them are given by a flow diagram.Its feasibility and correctness are verified by a simulation example,and then the effect of the resolution of the DEM on the vertex error of each building is analyzed.Besides,a vertically polarized dipole antenna in a typical macro-cellular environment is simulated by using the DEM-based ray tracing model,and the results of power coverage are shown in an intuitive way,which extends the applicability of the ray tracing model and provides a new idea for the study of radio propagation in urban macro-cellular scenes.
In order to solve the problem of data sharing between different formats of a digital map,this paper introduces the modeling ideas and storage formats of the traditional digital map and digital elevation model(DEM),on the basis of which the algorithms for conversion between them are given by a flow diagram.Its feasibility and correctness are verified by a simulation example,and then the effect of the resolution of the DEM on the vertex error of each building is analyzed.Besides,a vertically polarized dipole antenna in a typical macro-cellular environment is simulated by using the DEM-based ray tracing model,and the results of power coverage are shown in an intuitive way,which extends the applicability of the ray tracing model and provides a new idea for the study of radio propagation in urban macro-cellular scenes.
引文
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[11]孙爱玲,赵光华,赵敏华,等.基于sign(x)函数的点在多边形内外判别算法及应用[J].计算机工程与科学,2017,39(4):785-790.SUN Ailing,ZHAO Guanghua,ZHAO Minhua,et al.A Sign(x)Point in-out Polygon Test Algorithm Based on Sign Function and Its Application[J].Computer Engineering and Science,2017,39(4):785-790.
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[2]FUSCHINI F,VITUCCI E M,BARBIROLI M,et al.Ray Tracing Propagation Modeling for Future Small-cell and Indoor Applications:a Review of Current Techniques[J].Radio Science,2015,50(6):469-485.
[3]景国彬,张云骥,孙光才,等.一种三维地面场景SAR回波仿真的快速实现方法[J].西安电子科技大学学报,2017,44(3):1-7.JING Guobin,ZHANG Yunji,SUN Guangcai,et al.Fast Method for SAR Echo Simulation of a Three-dimensional Ground Scene[J].Journal of Xidian University,2017,44(3):1-7.
[4]BHUVANESHWARI A,HEMALATHA R,SATYA SAVITHRI T.Development of an Optimized Ray Tracing Path Loss Model in the Indoor Environment[J].Wireless Personal Communications,2017,96(1):1039-1064.
[5]LIU Z,GUO L,GUAN X,et al.Effects of Urban Microcellular Environments on Ray-tracing-based Coverage Predictions[J].Journal of the Optical Society of America A:Optics,Image Science and Vision,2016,33(9):1738-1746.
[6]HOU Q,CAI M,WANG H.Dynamic Modeling of Traffic Noise in both Indoor and Outdoor Environments by Using a Ray Tracing Method[J].Building and Environment,2017,121:225-237.
[7]刘忠玉.室内外场景下基于射线跟踪算法的无线信道预测研究[D].西安:西安电子科技大学,2013.
[8]袁正午.移动通信系统终端射线跟踪定位理论与方法[M].北京:电子工业出版社,2007.
[9]冯永胜,郭立新,刘忠玉.基于射线跟踪算法数字地图自动提取与预处理[J].电子科技,2012,25(10):4-7.FENG Yongsheng,GUO Lixin,LIU Zhongyu.Automatic Extraction and Preprocessing Technology for the Digital Map Based on the Ray Tracing Algorithm[J].Electronic Science and Technology,2012,25(10):4-7.
[10]赵博华.基于DEM的流域特征提取方法研究进展[J].人民珠江,2016,37(2):43-47.ZHAO Bohua.Research Progress of Watershed Characteristics Extraction Methods Based on DEM[J].Pearl River,2016,37(2):43-47.
[11]孙爱玲,赵光华,赵敏华,等.基于sign(x)函数的点在多边形内外判别算法及应用[J].计算机工程与科学,2017,39(4):785-790.SUN Ailing,ZHAO Guanghua,ZHAO Minhua,et al.A Sign(x)Point in-out Polygon Test Algorithm Based on Sign Function and Its Application[J].Computer Engineering and Science,2017,39(4):785-790.
[12]阮秋琦.数字图像处理学[M].北京:电子工业出版社,2007.