Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Thermal pointing error analysis of the observation satellites with interpolated temperature based on PAT method

PAT 기반 온도장 보간을 이용한 관측위성의 열지향오차해석

  • Lim, Jae Hyuk (Korea Aerospace Research Institute, Satellite Mechanical Team) ;
  • Kim, Sun-Won (Korea Aerospace Research Institute, Satellite Mechanical Team) ;
  • Kim, Jeong-Hoon (Korea Aerospace Research Institute, Satellite Mechanical Team) ;
  • Kim, Chang-Ho (Korea Aerospace Research Institute, Satellite Mechanical Team) ;
  • Jun, Hyoung-Yoll (Korea Aerospace Research Institute, Satellite Mechanical Team) ;
  • Oh, Hyeon Cheol (Korea Advanced Institute of Science and Technology, Department of Mechanical Engineering) ;
  • Shin, Chang Min (Korea Advanced Institute of Science and Technology, Department of Mechanical Engineering) ;
  • Lee, Byung Chai (Korea Advanced Institute of Science and Technology, Department of Mechanical Engineering)
  • Received : 2015.09.16
  • Accepted : 2015.12.14
  • Published : 2016.01.01
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Abstract

In this work, we conduct a thermal pointing error analysis of the observation satellites considering seasonal and daily temperature variation with interpolated temperature based on prescribed average temperature (PAT) method. Maximum 200 degree temperature excursion is applied to the observation satellites during on-orbit operation, which cause the line of sight (LOS) to deviate from the designated pointing direction due to thermo-elastic deformation. To predict and adjust such deviation, the thermo-elastic deformation analysis with a fine structural finite element model is accomplished with interpolated thermal maps calculated from the results of on-station thermal analysis with a coarse thermal model. After verifying the interpolated temperatures by PAT with two benchmark problems, we evaluate the thermal pointing error.

본 논문에서는 계절 및 주야의 온도변화를 고려한 관측위성의 열지향오차해석을 실시한다. 관측위성은 임무수행기간 동안 다채널의 관측센서를 이용해서 지구표면의 영상을 촬영한다. 그러나 주야 및 계절별로 최대 200도의 온도환경 차이가 발생하며 이로 인해 관측센서 및 별추적기의 시선벡터가 변화되고 정해진 목표지점의 영상촬영이 어렵다. 이런 문제를 사전예측하고 대응하기 위해서 열지향오차해석을 실시한다. 우선 궤도열환경해석으로부터 도출된 성긴 온도장 정보를 상세한 구조유한요소모델에 PAT기법을 이용해 보간하여 온도변화에 따른 열변형해석을 수행하였다. PAT로 보간된 온도분포의 정확도를 검증하였으며, 열변형해석결과로부터 열지향오차를 도출하였다.

Keywords

References

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