针对星载SAR法拉第旋转估计的NeQuick-2模型精度分析  

Accuracy Evaluation of NeQuick-2 Model for Faraday Rotation Estimation of Space-Borne SAR

作　　者：訾海峰[1] 门志荣 陈筠力[3] 孙永岩[1] 刘艳阳[1] ZI Haifeng;MEN Zhirong;CHEN Junli;SUN Yongyan;LIU Yanyang(Shanghai Institute of Satellite Engineering,Shanghai 201109,China;School of Electronic and Information Engineering,Beihang University,Beijing 100191,China;Shanghai Academy of Space Technology,Shanghai 201109,China)

机构地区：[1]上海卫星工程研究所,上海201109 [2]北京航空航天大学电子信息工程学院,北京100191 [3]上海航天技术研究院,上海201109

出　　处：《上海航天（中英文）》2020年第5期79-85,共7页Aerospace Shanghai（Chinese&English）

基　　金：上海航天科技创新基金(SAST2018‑040)。

摘　　要：P波段星载合成孔径雷达(SAR)凭借其较强的穿透能力,在对森林、沙地等观测方面具有较强的优势,但易受法拉第旋转等电离层干扰的影响,其图像质量严重下降。本文针对现有电离层模型的精度开展分析,以基于GPS的CODE GIM全球电离层实测数据为参考,对比评估NeQuick-2模型的电离层总电子量表征能力。在分析CODE GIM实测数据特点的基础上,讨论其在星载SAR领域的局限性;在解析NeQuick-2模型和方法的基础上,研究其表征精度的影响因素;通过对比该模型生成的电离层数据与CODE GIM数据,验证NeQuick-2模型的估计精度。结果表明:NeQuick-2模型可满足P波段星载SAR的法拉第旋转角估计和校正的需求。Due to the strong penetrating ability,P-band space-borne synthetic aperture radar(SAR)has significant advantages in the observation of forests,sandy land,etc.However,its image quality will be seriously degraded by the ionospheric interferences such as the Faraday rotation angle.In this paper,the accuracy of the existing ionospheric model is analyzed.The GPS-based CODE GIM global ionospheric data are used as a reference to compare and evaluate the ability of the NeQuick-2 model in estimating the total electron content(TEC)of ionosphere.First,the limitations of the CODE GIM data in the field of space-borne SAR are discussed.Then,based on the analysis of the NeQuick-2 model,the influencing factors are studied.Finally,the estimation accuracy of the NeQuick-2 model is verified by comparing the ionospheric data generated by the model with the CODE GIM data.The results show that the NeQuick-2 model can meet the requirements of estimating and correcting the Faraday rotation angle for P-band spaceborne SAR.

关 键 词：星载合成孔径雷达(SAR) P波段 CODE GIM数据 NeQuick-2模型 电离层TEC 

分 类 号：TN957[电子电信—信号与信息处理]