предыдущий|следующий

Imaging compensation of orbital motion for geostationary meteorological satellite

  • role： First author第一作者
  • Affiliation：

    Shanghai Institute of Satellite Engineering, Shanghai 201109, China

    General Technical Laboratory for Earth Remote Sensing Satellite, Shanghai 201109, China

  • Email：lvwang509@126.com
  • Introduction：吕旺，1983年生，男，高级工程师，研究方向为卫星图像导航与配准、卫星总体设计的理论和技术。E-mail：lvwang509@126.com
Wang LYU12,  
  • Affiliation：

    Shanghai Academy of Space Technology, Shanghai 201109, China

Yaohai DONG3,  
  • Affiliation：

    Shanghai Institute of Satellite Engineering, Shanghai 201109, China

Yili SHEN1,  
  • Affiliation：

    National Satellite Meteorological Center, Beijing 100081, China

Zhiqing ZHANG4,  
  • Affiliation：

    Shanghai Academy of Space Technology, Shanghai 201109, China

Wenqiang CHEN3

реферат

In recent years, a new generation of stationary meteorological satellites in various countries has adopted the three-axis stabilized mode of operation to scan the Earth for further improvement of observation frequency and signal–noise ratio. Image registration and navigation problems must be solved to accurately extract quantitative parameters of the Earth’s surface, clouds, and atmosphere at remote sensing target locations. Orbital drift movement is one of the main causes of satellite line-of-sight movement on the Earth’s surface. The relative movement generated between consecutive images affects the image registration accuracy of cloud animation. In this study, the imager on the Chinese FY-4 satellite that was launched in December 2016 is used as the research object. Moreover, a strict definition of image reference is given, and an orbital motion compensation method (OMC) is studied. By adding scan compensation to the imager 2-D scanning mechanism, the scanning path of the line of sight is navigated on the satellite in real time. Satellites are equivalent to viewing at ideal orbital positions. As a result, satellite remote sensing images are accurately registered to the Earth-fixed grid, and a relatively fixed geometric relationship is maintained. The correlation between L0 data and the measurement information of satellite orbit is removed due to the compensation performed on the satellite. Therefore, the long-term registration stability of the original image is guaranteed from the root. L0 remote sensing data from the FY-4 on-orbit test are used for experimental verification to prove the accuracy of the method. The results show that the relative movement of the north–south directions of the cloud animation is reduced from 973.0 μrad to 75.6 μrad (3σ) and that of the east–west direction is reduced from 205.8 μrad to 81.2 μrad (3σ). The interference of the orbital motion on the image navigation and registration is effectively reduced by the OMC on the satellite. In view of the development trend of the future imager of the geostationary meteorological satellite, the problem of the edge pixel error of the long aperture array detector caused by satellite orbital motion compensation is analyzed. Furthermore, a solution to reduce the edge error by maintaining the satellite near 0° inclination using an electric propulsion system is proposed.

ключеви́че слова́

geostationary meteorological satellite;Fengyun-4;FY-4;image registration;INR;orbital motion compensation;OMC

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