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Measurements of Faraday Rotation Using Polarimetric PALSAR Images

机译:使用极化PALSAR图像测量法拉第旋转

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摘要

For spaceborne synthetic aperture radar (SAR) systems operating at L-band frequencies or lower, the ionosphere may have a significant impact on the SAR images. The largest effect at L-band is caused by Faraday rotation (FR). Several studies have modeled the effect of FR and/or devised models to measure and correct FR. With the launch of the fully polarimetric L-band system Phased Array-type L-band SAR (PALSAR), it has become possible to test both models and measurement techniques on real SAR data. In this letter, the quality of calibrated polarimetric PALSAR data is assessed, and FR is measured. It is found that residual crosstalk and channel imbalance are small in the PALSAR data. Two methods are used to measure FR, the first using in-scene distributed targets and the second using large trihedrals. The two methods show very good agreement. The measurements are compared with values of the total electron content using a linear model. It is found that the model and measurements are in good agreement, with a root-mean-square error of 0.3deg or 15% of the mean FR angle.
机译:对于在L频段或更低频段工作的星载合成孔径雷达(SAR)系统,电离层可能会对SAR图像产生重大影响。 L波段的最大影响是法拉第旋转(FR)引起的。数项研究已经对FR的效果进行了建模,并且/或者设计了模型来测量和校正FR。随着全极化L波段系统相控阵型L波段SAR(PALSAR)的推出,可以在真实SAR数据上测试模型和测量技术。在这封信中,评估了极化偏振PALSAR数据的质量,并测量了FR。发现在PALSAR数据中残留串扰和信道不平衡很小。有两种方法用于测量FR,一种是使用现场分布的目标,另一种是使用大三面体。两种方法显示出很好的一致性。使用线性模型将测量结果与总电子含量的值进行比较。发现模型和测量值吻合良好,均方根误差为0.3deg或平均FR角的15%。

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