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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Theoretical Study of Global Sensitivity Analysis of L-Band Radar Bistatic Scattering for Soil Moisture Retrieval
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Theoretical Study of Global Sensitivity Analysis of L-Band Radar Bistatic Scattering for Soil Moisture Retrieval

机译：L波段雷达双基地散射对土壤水分反演的整体敏感性分析的理论研究

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摘要

This letter explores the optimal bistatic radar configurations for bare soil moisture retrieval at L-band using a global sensitivity analysis method, the extended Fourier amplitude sensitivity test (EFAST) algorithm. Complete sets of bistatic scattering, covering a wide range of geometric parameters and ground surface conditions, are simulated by the well-established advanced integral equation model. The sensitivity of radar bistatic signals to soil moisture and surface roughness, and the interactions among the parameters are quantified using the EFAST algorithm. The results show that in bistatic scattering, VV polarization has notably higher sensitivity to soil moisture than HH polarization, particularly at large incident angles. For VV polarization, as incident angle increases, the sensitivity zone of soil moisture expands and shifts toward the forward direction, specifically at small azimuth scattering angles and large scattering angles, thereby becoming promising configurations for soil moisture retrieval. For HH polarization, in contrast, the sensitive zone gradually moves to the backward direction as incident angle increases, and an intermediate incident angle (e.g., 40°) is recommended for retrieving soil moisture by considering both sensitivity strength and parameter interaction effects.
机译：这封信探讨了使用全局灵敏度分析方法，扩展傅里叶幅度灵敏度测试（EFAST）算法在L波段裸露土壤水分获取的最佳双基地雷达配置。完善的高级积分方程模型模拟了涵盖广泛几何参数和地面条件的整套双基地散射。雷达双基地信号对土壤水分和表面粗糙度的敏感性以及参数之间的相互作用使用EFAST算法进行了量化。结果表明，在双基地散射中，VV极化对土壤水分的敏感性明显高于HH极化，特别是在大入射角下。对于VV极化，随着入射角的增加，土壤水分的敏感区域会扩大并朝着前进方向移动，特别是在较小的方位角散射角和较大的散射角下，从而成为有希望的土壤水分检索配置。相比之下，对于HH极化，随着入射角的增加，敏感区域逐渐向后移动，建议同时考虑灵敏度强度和参数相互作用效应，以中间入射角（例如40°）来获取土壤水分。

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