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Precise Orbit Determination of LEO Satellite Using Dual-Frequency GPS Data

이중 주파수 GPS 데이터를 이용한 저궤도 위성의 정밀궤도결정

  • 황유라 (한국전자통신연구원 위성관제항법연구팀) ;
  • 이병선 (한국전자통신연구원 위성관제항법연구팀) ;
  • 김재훈 (한국전자통신연구원 위성관제항법연구팀) ;
  • 윤재철 (한국항공우주연구원 다목적실용위성-5호 체계팀)
  • Published : 2009.06.15

Abstract

KOorea Multi-purpose SATellite(KOMPSAT)-5 will be launched at 550km altitude in 2010. Accurate satellite position(20 cm) and velocity(0.03 cm/s) are required to treat highly precise Synthetic Aperture Radar(SAR) image processing. Ionosphere delay was eliminated using dual frequency GPS data and double differenced GPS measurement removed common clock errors of both GPS satellites and receiver. SAC-C carrier phase data with 0.1 Hz sampling rate was used to achieve precise orbit determination(POD) with ETRI GNSS Precise Orbit Determination(EGPOD) software, which was developed by ETRI. Dynamic model approach was used and satellite's position, velocity, and the coefficients of solar radiation pressure and drag were adjusted once per arc using Batch Least Square Estimator(BLSE) filter. Empirical accelerations for sinusoidal radial, along-track, and cross track terms were also estimated once per revolution for unmodeled dynamics. Additionally piece-wise constant acceleration for cross-track direction was estimated once per arc. The performance of POD was validated by comparing with JPL's Precise Orbit Ephemeris(POE).

Keywords

precise orbit determination;carrier phase;dual frequency;double differenced data;empirical acceleration

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