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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Analysis of the Effect of Soil Roughness in the Forward-Scattering Interference Pattern Using Second-Order Small Perturbation Method Simulations
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Analysis of the Effect of Soil Roughness in the Forward-Scattering Interference Pattern Using Second-Order Small Perturbation Method Simulations

机译：二阶小扰动方法模拟对前散射干涉模式中土壤粗糙度的影响分析

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摘要

Soil moisture (SM) is a key geophysical variable that can be estimated at regional scales using remote sensing techniques, by making use of the known relationship between soil reflectivity and the dielectric constant in the microwave regime. In this context, the exploitation of available illuminators of opportunity that currently emit large amounts of power at microwave frequencies (compared to typical synthetic aperture radar systems) is promising. Some published techniques estimate SM by analyzing the interference pattern (IP) between direct and reflected signal as measured by a single antenna (i.e., IP technique). In this letter, a new approach to simulate the IP is proposed, in which the soil roughness is modeled straightforwardly using the second-order small perturbation model. Results illustrate that the "notch" in the VV-polarization IP (related to the Brewster angle) can only be directly observed for very low values of soil rms roughness (s < 0.5 cm). For typical values of soil roughness (s similar to 1.2 cm), the notch disappears and only a minimum in the IP is observed near the Brewster angle.
机译：土壤湿度（SM）是通过利用土壤反射率和微波制度中的介电常数之间的已知关系，在区域尺度估计的关键地球物理变量。在这种情况下，利用当前在微波频率下发出大量功率的机会的可用照明器（与典型的合成孔径雷达系统相比）是有前途的。一些公开的技术通过通过单个天线（即，IP技术）测量的直接和反射信号之间的干扰图案（IP）来估计SM。在这封信中，提出了一种模拟IP的新方法，其中土壤粗糙度使用二阶小扰动模型直接建模。结果表明，只能直接观察到VV偏振IP中的“凹口”（与布鲁斯特角有关），用于非常低的土壤RMS粗糙度（S <0.5cm）。对于土壤粗糙度的典型值（类似于1.2cm），凹口消失，在布鲁斯特角附近观察到IP中的最小值。

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