基于数字地图的二维电波传播问题仿真

为快速预测二维地理环境下的电磁环境特性，应用二维抛物方程模型对电磁环境进行仿真。为了得到真实有效的地形数据，研究了从GeoTiff中抽取网格点上地理信息的方法，并利用双线性插值法计算了任意位置处的高程值。同时研究了地球表面两点之间计算距离的方法，将该方法的计算结果与GIS软件结果进行对比，验证了该方法的可靠性。在标准大气环境下，利用二维抛物方程模型仿真分析了不同距离处不同高度的电波传播传播因子的变化情况，为预测真实地理环境中的电波传播特性提供了一种有效的方法。

Two-dimensional electromagnetic environment simulation based on digital map

To quickly predict the characteristic of the electromagnetic environment in two-dimensional terrain environment, this paper uses the two-dimensional parabolic equation model to simulate the electromagnetic environment. In order to get the real and effective terrain information, this paper studies the method to extract the grids terrain information from the GeoTiff, then uses the bilinear interpolation method to obtain the elevation value of the arbitrary location on the terrain profile. The calculation method of distance between two points on the Earths surface is also studied, and the results obtained by this method are compared with those obtained by the GIS software, which verifies the accuracy of the method. In the standard atmosphere condition, this paper uses the two-dimensional parabolic equation model to simulate and analyze the variation of the radio wave propagation factor with height in different distance and offers an efficient method to predict the characteristics of the wave propagation in the real terrain environment.