【摘要】 为获取真实地形表面环境电磁散射特性数据，基于Peplinski土壤介电常数模型对土壤介电特性进行建模，通过数字高程模型（DEM）构建实际地形表面的起伏情况，应用时域有限差分（FDTD）方法分析了实际地形表面的电磁散射行为。通过数值仿真获得了散射系数的角分布曲线，并探讨了散射系数随土壤含水量、粘土含量、土壤容重、砂粒分数、入射角、入射频率的变化规律。数据分析发现，散射系数随散射角振荡地变化，散射系数随土壤含水量、入射角的增加而减小，随粘土含量、土壤容重、砂粒分数、入射波频率的变化而没有明显的变化。研究结果对于理解实际地形表面的电磁散射行为提供了理论依据和实践指导。更多还原

【Abstract】 To acquire electromagnetic scattering data from realistic terrain environments, this study employed the Peplinski soil dielectric constant model to characterize soil dielectric properties. Digital Elevation Models(DEMs) were used to reconstruct terrain surface topography, and the Finite-Difference Time-Domain(FDTD) method was applied to analyze electromagnetic scattering behavior from these surfaces. Numerical simulations generated angular distribution curves of scattering coefficients, and the change rule between scattering coefficients and various parameters—including soil moisture content, clay content, soil bulk density, sand fraction, incident angle, and incident frequency were investigated.Data analysis revealed that the scattering coefficient exhibits oscillatory variations with respect to the scattering angle and decreases with increasing soil moisture content and incident angle, while showing no significant variation with changes in clay content, soil bulk density, sand fraction, or incident frequency. This research provides theoretical foundation and practical guidance for understanding electromagnetic scattering behavior from real terrain surfaces.更多还原