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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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GPS-Based Orbit Determination for KOMPSAT-5 Satellite

  • Hwang, Yoo-La (Broadcasting & Telecommunications Convergence Research Laboratory, ETRI) ;
  • Lee, Byoung-Sun (Broadcasting & Telecommunications Convergence Research Laboratory, ETRI) ;
  • Kim, Young-Rok (Department of Astronomy and Space Sciences, Yonsei University) ;
  • Roh, Kyoung-Min (Space Geodesy Research Group, KASI) ;
  • Jung, Ok-Chul (LEO Satellite Mission Operations Department, KARI) ;
  • Kim, Hae-Dong (Department of Aerospace Engineering, Sejong University)
  • Received : 2011.01.14
  • Accepted : 2011.05.19
  • Published : 2011.08.30
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Abstract

Korea Multi-Purpose Satellite-5 (KOMPSAT-5) is the first satellite in Korea that provides 1 m resolution synthetic aperture radar (SAR) images. Precise orbit determination (POD) using a dual-frequency IGOR receiver data is performed to conduct high-resolution SAR images. We suggest orbit determination strategies based on a differential GPS technique. Double-differenced phase observations are sampled every 30 seconds. A dynamic model approach using an estimation of general empirical acceleration every 6 minutes through a batch least-squares estimator is applied. The orbit accuracy is validated using real data from GRACE and KOMPSAT-2 as well as simulated KOMPSAT-5 data. The POD results using GRACE satellite are adjusted through satellite laser ranging data and compared with publicly available reference orbit data. Operational orbit determination satisfies 5 m root sum square (RSS) in one sigma, and POD meets the orbit accuracy requirements of less than 20 cm and 0.003 cm/s RSS in position and velocity, respectively.

Keywords

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