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Two judging methods of seamless stitching for frame sensor on the geostationary orbit: Grid method and the geometric intersection method

  • role： First author第一作者
  • Email：wangmeizhu2013@163.com
  • Introduction：王梅竹(1991—　)，女，博士研究生，研究方向为海洋遥感、图像消旋以及图像拼接。E-mail：wangmeizhu2013@163.com
Meizhu WANG,  
  • No information about the author is available
Xiaoxian HUANG,  
  • role： Corresponding author通信作者
  • Email：fengqi168@vip.sina.com
  • Introduction：冯旗(1964—　)，男，研究员，研究方向为航天光电遥感系统。E-mail：fengqi168@vip.sina.com
Qi FENG*

resumen

Geostationary satellites can perform high-frequency observation in the same area of the Earth. To extend the area of observation, we use a two-dimensional pointing mirror combined with a frame sensor. A two-dimensional pointing mirror can acquire image information in a short time, and its small volume and low weight render it an appropriate device loaded on the satellite. However, imaging theory of the pointing mirror indicates that image rotation and non-linear error reduce the geometric accuracy of image and may cause missing scans. To address the problem, we first analyze the imaging characteristics of each slot and calculate the rotation angle. We numerically analyze different types of angular error introduced from pitch and azimuth rotation. Then, we propose a mechanism by which the pointing angle affects image coverage. We provide a flow chart of cover rate analysis and figures showing the cover area of different pointing angles. Boundary diagrams of slots are drawn to display the relationship between angular variations and cover rate. After numerical analysis, we find a better way to observe the Northern Hemisphere. Then, we develop two judging methods of seamless stitching: grid method and geometric intersection method. The grid method is used to grid the pointing plane and label cover time on each grid point, whereas the geometric intersection method is used to determine whether the image information is missing on the basis of intersecting relations of the slot envelope. Different situations of geometric intersection are listed. The two methods are also compared. The grid method can determine the coverage time, and the geometric method has great advantages of speed and accuracy. Finally, the two methods have been used to obtain the cover situation of the edge of the Earth at different scanning angles, to find the maximum pitch and azimuth angle interval of the proposed optical system, which can cover the global area and seamless splicing images. When the point mirror is rotating in azimuth, image rotation is more obvious with an increase in motor angle. When the mirror is rotating in pitch, the rotation angle increases with a decrease in pitch angle. Thus, the relative location of the follow-up optical elements should be considered to obtain a low rotation angle of key observation area. This process provides the theoretical basis for setting the turning step of the motor and ensures that the time resolution of the load is increased without geometric information leakage.

palabra clave

image rotation;seamless;geostationary;two-dimensional pointing mirror;missing scan

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