| 摘要: |
| 为分析分布目标基线定标方法的L波段适用性，本文结合我国于2021年发射的L波段编队InSAR卫星（TwinSAR-L）的系统参数，从典型分布目标的穿透和后向散射系数特性出发，指出分布目标参考高程误差不仅包括自身测量误差还包含由穿透和信噪比去相干引入的参考高程误差ΔherrPen和ΔherrSNR，并利用TwinSAR-L数据及TanDEM-X分布目标基线定标模型分析了这两项误差与基线定标误差之间的关系。最后，利用ALOS-2数据定量分析发现研究区域L波段的ΔherrPen，ΔherrSNR分别为1.09m，1.39m。这将分别引入7.9mm，10mm的基线定标误差，严重影响基线定标和后续DEM产品精度。本文的研究工作对TwinSAR-L的基线定标具有一定的理论指导意义。 |
| 关键词: 编队InSAR 基线定标 穿透深度 后向散射系数 |
| DOI：DOI:10.3969/j.issn.1672-2337.2022.01.009 |
| 分类号:TN958 |
| 基金项目:国家自然科学基金（No.61771453） |
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| Reference Height Error Analysis for Baseline Calibration in TwinSAR-L |
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QI Yang，WANG Yu，HONG Jun，DU Shaoyan，QIU Tian，XING Kaichu
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1. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China;2. National Key Lab of Microwave Imaging Technology, Chinese Academy of Sciences, Beijing 100190, China;3. University of Chinese Academy of Sciences, Beijing 100049, China
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| Abstract: |
| To explode whether baseline calibration method based on a distributed target DEM is applicable in L-band, this paper combines the parameters of the TwinSAR-L which is an innovative spaceborne bistatic synthetic-aperture radar (BiSAR) mission, and starts from the characteristics of the penetration and backscatter coefficients of the typical distributed target. It is pointed out that the distributed target reference height errors include not only its own measurement error, but also the reference height errors ΔherrPen and ΔherrSNR introduced by penetration and SNR decorrelation. The TwinSAR-L data are used to analyze the relationship between these two errors and the baseline calibration errors. Finally, the quantitative analysis using ALOS-2 data finds that theΔherrPen and ΔherrSNR of the L-band in the study area are 1.09m and 1.39m, respectively. This introduces 7.9mm and 10mm baseline calibration errors and seriously affect the accuracy of the baseline calibration and the accuracy of DEM products. The research in this paper has certain theoretical guiding significance for the baseline calibration of TwinSAR-L. |
| Key words: distributed interferometric synthetic aperture radar (InSAR) baseline calibration penetration error backscatter coefficient |
