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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Evaluation of Radar Backscattering Models IEM, Oh, and Dubois for SAR Data in X-Band Over Bare Soils
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Evaluation of Radar Backscattering Models IEM, Oh, and Dubois for SAR Data in X-Band Over Bare Soils

机译:裸土壤X波段SAR数据的雷达反向散射模型IEM,Oh和Dubois的评估

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摘要

The objective of this letter is to evaluate the surface radar backscattering models, namely, integral equation model (IEM), Oh, and Dubois, for synthetic aperture radar data in X-band over bare soils. This analysis uses a large database of TerraSAR-X images and in situ measurements (soil moisture “$mv$” and surface roughness “ $h_rms$”). Oh''s model correctly simulates the radar signal for $HH$ and $VV$ polarizations, whereas the simulations performed with the Dubois model show a poor correlation between TerraSAR-X data and model. The backscattering IEM simulates correctly the backscattering coefficient only for $h_rms < 1.5 hbox{cm}$ in using an exponential correlation function and for $h_rms > 1.5 hbox{cm}$ in using Gaussian function. However, the results are not satisfactory for the use of IEM in the inversion of TerraSAR-X data. A semiempirical calibration of IEM was done in X-band. Good agreement was found between the TerraSAR-X data and the simulations using the calibrated version of the IEM.
机译:这封信的目的是评估裸露土壤X波段合成孔径雷达数据的地面雷达反向散射模型,即积分方程模型(IEM),Oh和Dubois。该分析使用了TerraSAR-X图像和现场测量的大型数据库(土壤湿度“ $ mv $”和表面粗糙度“ $ h_rms $”)。 Oh的模型可以正确地针对$ HH $和$ VV $极化仿真雷达信号,而使用Dubois模型进行的仿真表明TerraSAR-X数据与模型之间的相关性很差。反向散射IEM仅在使用指数相关函数时对于$ h_rms <1.5 hbox {cm} $和在使用高斯函数时对于$ h_rms> 1.5 hbox {cm} $能够正确模拟反向散射系数。但是,对于在TerraSAR-X数据反演中使用IEM的结果并不令人满意。在X波段完成了IEM的半经验校准。在TerraSAR-X数据和使用IEM校准版的仿真之间找到了很好的一致性。

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