中国空间科学技术

中国空间科学技术 ›› 2022, Vol. 42 ›› Issue (4): 8-18.doi: 10.16708/j.cnki.1000-758X.2022.0047

• 论文 • 上一篇    下一篇

FY-3D 中分辨率成像仪图像地理定位误差来源分析

黄旭星，杨勇，佘宇琛，景振华，胡秀清，高旭东，李爽   

  1. 1南京航空航天大学 航天学院，南京210016  
    2上海卫星工程研究所，上海201109  
    3国家卫星气象中心，北京100081
  • 出版日期:2022-08-25 发布日期:2022-08-09
  • 基金资助:
    上海航天科技创新基金（SAST2020-031）

Analysis on geolocation error of FY-3D MERSI imaging

HUANG Xuxing，YANG Yong，SHE Yuchen，JING Zhenhua，HU Xiuqing，GAO Xudong，LI Shuang   

  1. 1College of Astronautics，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China 
    2Shanghai Institute of Satellite Engineering，Shanghai 201109，China  
    3National Satellite Meteorological Centre，Beijing 100081，China
  • Published:2022-08-25 Online:2022-08-09

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摘要： 以风云三号D星（FY-3D）中分辨率成像仪（MERSI）的图像地理定位为背景，针对现阶段FY-3D图像与海岸线匹配时误差表现为周期性振荡的现象，从卫星轨道和姿态控制的角度出发，分析了当前卫星运行策略对图像地理定位精度的影响。首先，建立了当前FY-3D卫星动力学模型和成像模型；然后，以FY-3D/MERSI真实遥感图像为基础，分析姿轨控分系统对遥感图像周期性定位造成的误差；最后，通过对比数值仿真结果与真实图像数据，对来自姿轨控分系统的图像定位误差来源进行了验证。研究表明，姿轨控分系统的轨道、姿态预报误差以及载荷安装误差都会导致成像基准产生偏差，进而使图像的地理定位误差呈现周期性振荡现象。

关键词: 风云三号D卫星, 地理定位, 周期性误差, 姿轨控系统, 误差分析, 载荷安装误差

Abstract: Accurate geolocation of Fengyun 3D（FY-3D）medium resolution spectral imager（MERSI）images improves the remote sensing performance.Given that the coastline of the images after geolocating generates a periodically oscillating error in this stage，the geolocation error was systemically analyzed based on the attitude and orbit control of satellites.Firstly，the FY-3D satellite′s dynamic model and the imaging model were established.Then，based on real images from the FY-3D/MERSI，the geolocation errors resulting from the attitude and orbit control subsystem were analyzed.Finally，the source of geolocation error was validated in numerical simulations by comparing the results with real images.The study indicates that onboard attitude and orbit propagation errors and payload mounting error of the attitude and orbit control subsystem can cause the deviation of the imaging reference，thereby leading to the periodically oscillating error of the images after geolocating.

Key words: FY-3D satellite, geolocation, periodic error, attitude and orbit control system, error analysis, payload mounting error

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