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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Effect of multiple scattering on the phase signature of wet subsurface structures: applications to polarimetric L- and C-band SAR
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Effect of multiple scattering on the phase signature of wet subsurface structures: applications to polarimetric L- and C-band SAR

机译：多重散射对湿地下结构的相位特征的影响：在极化L波段和C波段SAR中的应用

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摘要

We propose a two-layer integral equation model (IEM) model including multiple-scattering terms to reproduce the phase signature of buried wet structures that we observed on L-band synthetic aperture radar (SAR) images. We have good agreement between the extended (single+multiple scattering) IEM model and previous results obtained using a single-scattering IEM model combined with finite-difference time-domain simulations. We show that the multiple scattering not only significantly influences the copolarized phase difference but can also be related to the soil moisture content. In order to assess the validity of our extended model, we performed radar measurements on a natural outdoor site and showed that they could be fairly well fitted to the extended model. A parametric analysis presents the dependence of the copolarized phase difference on roughness parameters (rms height and correlation length) and radar parameters (frequency and incidence angle). Our study also shows that the phase signature should allow detection of buried wet structures down to a larger depth for C-band (3.8 m) than for L-band (2.6 m). This signature could then be used to map subsurface moisture in arid regions using polarimetric SAR systems.
机译：我们提出了一个包含多个散射项的两层积分方程模型（IEM）模型，以重现我们在L波段合成孔径雷达（SAR）图像上观察到的掩埋湿结构的相位特征。我们在扩展的（单次+多次散射）IEM模型与使用单散射IEM模型结合有限差分时域仿真获得的先前结果之间有着很好的一致性。我们表明多重散射不仅显着影响了同极化的相位差，而且还与土壤含水量有关。为了评估扩展模型的有效性，我们在一个自然的室外场地进行了雷达测量，结果表明它们可以很好地适合扩展模型。参数分析显示了共极化相位差对粗糙度参数（均方根高度和相关长度）和雷达参数（频率和入射角）的依赖性。我们的研究还表明，相位签名应该可以检测出比C波段（2.6 m）低得多的C波段（3.8 m）的埋入湿结构。然后可以使用极化SAR系统将该特征用于绘制干旱地区的地下水分。

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