Journal of Aerospace System Engineering (항공우주시스템공학회지)

The Society for Aerospace System Engineering (항공우주시스템공학회)
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Analysis on the Impact of Space Environment on LEO Satellite Orbit

우주환경 변화에 따른 저궤도 위성의 궤도변화 분석

  • Jung, Okchul (LEO Satellite Mission Operations Department, Korea Aerospace Research Institute) ;
  • Yim, Hyeonjeong (LEO Satellite Mission Operations Department, Korea Aerospace Research Institute) ;
  • Kim, Hwayeong (LEO Satellite Mission Operations Department, Korea Aerospace Research Institute) ;
  • Ahn, Sangil (LEO Satellite Mission Operations Department, Korea Aerospace Research Institute)
  • 정옥철 (한국항공우주연구원 저궤도위성관제팀) ;
  • 임현정 (한국항공우주연구원 저궤도위성관제팀) ;
  • 김화영 (한국항공우주연구원 저궤도위성관제팀) ;
  • 안상일 (한국항공우주연구원 저궤도위성관제팀)
  • Received : 2015.03.21
  • Accepted : 2015.06.25
  • Published : 2015.06.30
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Abstract

The satellite orbit is continuously changing due to space environment. Especially for low earth orbit, atmospheric drag plays an important role in the orbit altitude decay. Recently, solar activities are expected to be high, and relevant events are occurring frequently. In this paper, analysis on the impact of geomagnetic storm on LEO satellite orbit is presented. For this, real flight data of KOMPSAT-2, KOMPSAT-3, and KOMPSAT-5 are analyzed by using the daily decay rate of mean altitude is calculated from the orbit determination. In addition, the relationship between the solar flux and geomagnetic index, which are the metrics for solar activities, is statistically analyzed with respect to the altitude decay. The accuracy of orbit prediction with both the fixed drag coefficient and estimated one is examined with the precise orbit data as a reference. The main results shows that the improved accuracy can be achieved in case of using estimated drag coefficient.

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References

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