Volume IV-2
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., IV-2, 217-222, 2018
https://doi.org/10.5194/isprs-annals-IV-2-217-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., IV-2, 217-222, 2018
https://doi.org/10.5194/isprs-annals-IV-2-217-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  28 May 2018

28 May 2018

EXPLOITING AUTO-COLLIMATION FOR REAL-TIME ONBOARD MONITORING OF SPACE OPTICAL CAMERA GEOMETRIC PARAMETERS

W. Liu1, H. Wang2, D. Liu2, and Y. Miu1 W. Liu et al.
  • 1Xi’an Research Institute of Surveying and Mapping, No.1 Middle Yanta Road, Xi’an, China
  • 2State Key Laboratory of Integrated Service Network, Xidian University, Xi’an, China

Keywords: Optical Auto-collimation, Geometric Parameters, Onboard Monitoring, On-orbit Calibrate, Space Optical Camera, Autocollimator

Abstract. Precise geometric parameters are essential to ensure the positioning accuracy for space optical cameras. However, state-of-the-art onorbit calibration method inevitably suffers from long update cycle and poor timeliness performance. To this end, in this paper we exploit the optical auto-collimation principle and propose a real-time onboard calibration scheme for monitoring key geometric parameters. Specifically, in the proposed scheme, auto-collimation devices are first designed by installing collimated light sources, area-array CCDs, and prisms inside the satellite payload system. Through utilizing those devices, the changes in the geometric parameters are elegantly converted into changes in the spot image positions. The variation of geometric parameters can be derived via extracting and processing the spot images. An experimental platform is then set up to verify the feasibility and analyze the precision index of the proposed scheme. The experiment results demonstrate that it is feasible to apply the optical auto-collimation principle for real-time onboard monitoring.