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Faraday Rotation Correction for the SMAP Radiometer

机译：SMAP辐射计的法拉第旋转校正

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摘要

Faraday rotation is an important issue for remote sensing of parameters such as soil moisture and ocean salinity, which are best done at low microwave frequency (e.g., L-band). Modern instruments such as the radiometer on the Soil Moisture and Ocean Salinity (SMOS) satellite and the Aquarius radiometers include polarimetric radiometer channels specifically to implement a correction for Faraday rotation. This works well over ocean, but it is known that over inhomogeneous scenes, such as a land/water mixture, significant errors can occur. This is a particularly important issue for the newest L-band sensor in space, the radiometer on the Soil Moisture Active Passive (SMAP) satellite, where the goal is remote sensing over land (soil moisture) and where the conical scan induces rapid variation in Faraday rotation. Analysis is presented here of the issues associated with retrieving Faraday rotation using the SMAP geometry and antenna pattern. It is shown that, in addition to scenes with a mixture of land and water, scenes with significant vegetation canopy are also associated with large errors in the retrieved Faraday rotation. Examples from the SMAP radiometer support the analysis.
机译：法拉第旋转是遥感诸如土壤湿度和海洋盐度等参数的重要问题，最好在低微波频率（例如L波段）下完成。现代仪器，例如土壤湿度和海洋盐度（SMOS）卫星上的辐射计和水瓶座辐射计，都包括极化辐射计通道，专门用于校正法拉第旋转。这在海洋上效果很好，但是众所周知，在不均匀的场景（例如土地/水混合物）上，可能会发生重大错误。对于太空中最新的L波段传感器（土壤水分主动无源（SMAP）卫星上的辐射计）而言，这是一个特别重要的问题，其目标是遥感陆地（土壤水分），而锥形扫描会引起地面的快速变化。法拉第旋转。本文介绍了与使用SMAP几何形状和天线方向图检索法拉第旋转相关的问题。结果表明，除了土地和水混合的场景外，植被冠层很大的场景还与法拉第旋转中的大误差相关。 SMAP辐射计的示例支持分析。

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