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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Evaluation of a Numerical Modeling Approach Based on the Finite-Element Method for Calculating the Rough Surface Scattering and Emission of a Soil Layer
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Evaluation of a Numerical Modeling Approach Based on the Finite-Element Method for Calculating the Rough Surface Scattering and Emission of a Soil Layer

机译：基于有限元法的土层粗糙面散射与排放数值模拟方法的评估

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摘要

We evaluate a new 3-D numerical modeling approach for calculating the rough-surface scattering and emission of a soil layer. The approach relies on the use of Ansoft's numerical computation software High-Frequency Structure Simulator, which solves Maxwell's equations directly using the finite-element method. The interest of this approach is that it can be easily extended to studies of heterogeneous media. However, before being applied in this way, it must first be validated for the rough-surface case. In this letter, we perform this validation by comparing the results of rough-surface scattering and emission with the results of the method of moments (MoM) for a range of different roughness and permittivity conditions and with both Gaussian and exponential rough-surface autocorrelation functions. For the scattering case, we obtain results that are in agreement with the MoM to within approximately 1–3 dB for angles up to and including 40$^{circ}$ and 2–4 dB for angles from 50$^{circ}$ to 70 $^{circ}$. Agreement for emissivity is to within 3.2 and 3.6 K for low and high roughness conditions, respectively. We then illustrate the application of the new approach by calculating the emission of a two-layer system with rough surfaces, representing the soil-litter system in forests.
机译：我们评估了一种新的3-D数值建模方法，用于计算粗糙表面的散射和土壤层的发射。该方法依赖于Ansoft的数值计算软件“高频结构模拟器”的使用，该软件使用有限元方法直接求解Maxwell方程。这种方法的兴趣在于它可以轻松地扩展到异构媒体的研究。但是，在以这种方式应用之前，必须首先对粗糙表面情况进行验证。在这封信中，我们通过比较不同表面粗糙度和介电常数条件下的高斯和指数粗糙表面自相关函数，将粗糙表面散射和发射的结果与矩量法（MoM）的结果进行比较来执行此验证。对于散射情况，我们获得与MoM一致的结果，对于不超过40 $ ^ {circ} $的角度，在大约1-3 dB范围内，而对于不超过50 $ ^ {circ} $的角度，则为2-4 dB到70 $ ^ {circ} $。低粗糙度和高粗糙度条件下的发射率协议分别在3.2 K和3.6 K之内。然后，我们通过计算具有粗糙表面的两层系统（代表森林中的土壤凋落物系统）的排放来说明新方法的应用。

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