一种结合数字高程地图的射线跟踪建模方法

Geometric modeling method based on the digital elevation model in ray tracing

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 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 dipoleantenna in a typical macro-ccllular 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 raytracing model and provides a new idea for the study of radio propagation in urban macro-ccllular scenes.