Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (1): 340-348.doi: 10.13229/j.cnki.jdxbgxb20190885

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Attitude planning and fast simulation method for staring imaging of optical remote sensing satellite

Liu ZHANG1(),Xiao-han ZHANG1,Qing-xing YUE2,Nian LIU3,Kai-peng SUN4,Jie SUN4,Guo-wei FAN1()   

  1. 1.College of Instrument and Electrical Engineering，Jilin University，Changchun 130012，China
    2.Land Satellite Remote Sensing Application Center，Ministry of Natural Resources，Beijing 100048，China
    3.Beijing Institute of Tracking and Telecommunications Technology，Chinese People's Liberation Army Strategic Support Force，Beijing 100094，China
    4.Shanghai Institute of Satellite Engineering，Shanghai Academy of Spaceflight Technology，Shanghai 201109，China
  • Received:2019-09-16 Online:2021-01-01 Published:2021-01-20
  • Contact: Guo-wei FAN E-mail:zhangliu@jlu.edu.cn;fangw416@163.com

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Abstract:

At present， remote sensing satellite staring imaging attitude planning usually only considers the roll axis and the pitch axis， resulting in small angle rotation of the simulated image， reducing the video imaging quality. Also most of the simulation process does not consider the realtime simulation， that the simulation time is too long to meet the engineering requirements. To overcome the above problrms， in this paper， the yaw compensation for image rotation is corrected， and a fast simulation method for staring imaging for flat terrain is proposed. First， the formula for calculating the three-axis attitude of the spacecraft during ground staring imaging is deduced. Then， the geometric model of staring imaging is established based on the central projection， and the two-dimensional Lagrangian interpolation method is used to reconstruct the local surface of the earth. A simulation experiment for staring imaging of flat terrain was carried out. The simulation parameters were set to a track height of 526 km， a camera focal length of 1.45 m， and a pixel size of 5.5 μm. The simulation results show that the attitude planning error under this simulation condition is less than 0.004 m. When the elevation of the target area is simulated without considering the elevation change， the pixel error is less than 0.031. Compared with the direct method of point-by-point calculation， the simulation time is reduced by 87%.

Key words: staring imaging, attitude planning, fast simulation, two-dimensional interpolation

CLC Number: 

  • V416

Fig.1

Schematic diagram of coordinate system definition"

Fig.2

Schematic diagram of staring imaging"

Fig.3

Schematic diagram of image rotation"

Fig.4

Intersection of observation direction and ellipsoid of earth"

Fig.5

Software block diagram of simulation process"

Fig.6

Three-axis attitude angle change in 90 s"

Fig.7

Distance between optical axis pointing and target point"

Fig.8

Staring imaging simulation"

Table 1

Pixel error and time of fast simulation"

插值点个数像素误差时间/s时间比/%
直接法0118.570100
97.67.6906.486
120.94610.0688.491
160.03114.87912.549
208.19e-519.00716.030
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