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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Polarimetric Decomposition of L-Band PolSAR Backscattering Over the Austfonna Ice Cap
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Polarimetric Decomposition of L-Band PolSAR Backscattering Over the Austfonna Ice Cap

机译：L波段PolSAR反向散射在Austfonna冰帽上的极化分解。

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Over the last 30 years, the use of airborne and satellite remote sensing techniques has revolutionized glaciology through unequaled improvements in the scale and in the temporal and spatial resolutions of cryospheric observations. In this sense, the use of synthetic aperture radar (SAR) configurations likely was the greatest advance of the past two decades in the monitoring of the Earth's cryosphere. This paper describes a novel polarimetric scattering model to interpret polarimetric SAR (PolSAR) measurements of glaciers and ice sheets. Different scattering components are considered according to the specific glacier facies, in order to infer physical parameters of the ice volume. Total backscattering is modeled as the incoherent sum of possible surface and volume contributions. Surface scattering is described using the X-Bragg model in order to account for roughness, whereas clouds of spheroidal scatterers (either prolates or oblates) are considered to model volume scattering. The model includes differential propagation effects related to firn anisotropy and is therefore able to interpret polarimetric phase differences often present in PolSAR data acquired over glaciers. The developed model is used to interpret different scenarios imaged at L-band in fully polarimetric mode by the E-SAR sensor of the German Aerospace Center (DLR) over test sites located on the Austfonna ice cap, Svalbard, Norway, as part of the ICESAR2007 campaign. The obtained results are consistent with the reference information provided by the available ground measurements about the subsurface structure of the study area and encourage the use of dedicated scattering models for the different glacier zones.
机译：在过去的30年中，机载和卫星遥感技术的使用通过冰冻圈观测的规模以及时空分辨率的无与伦比的提高，彻底改变了冰川学。从这个意义上讲，使用合成孔径雷达（SAR）配置可能是过去二十年来在监测地球冰冻圈方面的最大进步。本文介绍了一种新颖的极化散射模型，用于解释冰川和冰盖的极化SAR（PolSAR）测量。为了推断冰量的物理参数，根据特定的冰川相考虑了不同的散射成分。总的反向散射建模为可能的表面和体积贡献的不相干总和。为了解决粗糙度，使用X-Bragg模型描述了表面散射，而球形散射体（长扁形或扁长形）的云被认为可以模拟体积散射。该模型包括与杉木各向异性有关的差分传播效应，因此能够解释在冰川上采集的PolSAR数据中经常存在的偏振相位差。所开发的模型用于解释由德国航空航天中心（DLR）的E-SAR传感器在位于挪威斯瓦尔巴特群岛奥斯特芬纳冰盖上的测试地点以全极化模式在L波段成像的不同场景，这是该模型的一部分。 ICESAR2007活动。获得的结果与有关研究区域地下结构的可用地面测量所提供的参考信息相一致，并鼓励对不同的冰川区域使用专用的散射模型。

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