In this paper, an analysis method of electromagnetic (EM) wave propagation in the troposphere is proposed using the parabolic equation (PE) and the actual two-dimensional modified refractivity (M-unit), that is, range and height dependent M-unit. Discrete Mixed Fourier Transform (DMFT) based PE method is used, and the validation is conducted using AREPS which is developed by the Space and Naval Warfare System Center of US NAVY. The M-units at the National Typhoon Center (NTC) in Jeju-island and meteorological station in Heuksan-island, South Korea are calculated using actual meteorological data. Then, two-dimensional M-unit is estimated using linear interpolation of M-unit at each position. The path loss between NTC and Heuksan-island is analyzed using the three types of M-unit data, Heuksan-island only, NTC only, and linear interpolation. The effect of two-dimensional M-unit on the EM wave propagation when considering long-range problem is discussed.

中文翻译：

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使用抛物线方程和二维折射率预测对流层中电磁波的传播

本文提出了一种利用抛物线方程（PE）和实际二维修正折射率（M-unit），即距离和高度相关的M-unit的电磁（EM）波在对流层传播的分析方法. 使用基于离散混合傅立叶变换（DMFT）的PE方法，并使用美国海军空间和海战系统中心开发的AREPS进行验证。韩国济州岛国家台风中心 (NTC) 和黑山岛气象站的 M 单位是根据实际气象数据计算得出的。然后，在每个位置使用 M 单元的线性插值估计二维 M 单元。NTC和黑山岛之间的路径损耗使用三种类型的M单元数据进行分析，仅黑山岛、仅NTC和线性插值。