The Influence of Antenna Pattern on Faraday Rotation in Remote Sensing at L-Band
The Influence of Antenna Pattern on Faraday Rotation in Remote Sensing at L-Band
复制标题
DOI：
10.1109/tgrs.2007.898237
复制
发表时间：
2007-07
影响因子：
8.2
通讯作者：
D. Vine;S. Jacob;E. Dinnat;P. D. Matthaeis;S. Abraham
中科院分区：
文献类型：
--
作者：
D. Vine;S. Jacob;E. Dinnat;P. D. Matthaeis;S. Abraham
在L波段被动遥感土壤水分和海洋盐分的背景下，研究了接收天线方向图对测量的法拉第旋转的影响。法拉第旋转是未来空间任务中辐射计的一个重要考虑因素，例如SMOS和宝瓶座。以宝瓶座上的辐射计为例，分析表明，虽然I=Tv+Th与一阶法拉第旋转角无关，但当考虑实际天线方向图时，i=Tv+Th与旋转角有关。此外，结果表明，使用第三斯托克斯参数来测量旋转角时，由于与主光束的有限宽度有关的纯几何问题，可能会产生高达1°的偏差。
The influence of the pattern of the receive antenna on measured Faraday rotation is examined in the context of passive remote sensing of soil moisture and ocean salinity at L-band. Faraday rotation is an important consideration for radiometers on future missions in space, such as SMOS and Aquarius. Using the radiometer on Aquarius as an example, it is shown that, while I = Tv + Th is independent of Faraday rotation to first order, it has rotation dependence when realistic antenna patterns are included in the analysis. In addition, it is shown that using the third Stokes parameter to measure the rotation angle can yield a result that is biased by as much as 1deg by purely geometrical issues that are associated with the finite width of the main beam.