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논문 기본 정보

자료유형
학술대회자료
저자정보
Muhammad Ilyas (Seoul National University) JunKyu Lim (School of Mechanical and Aerospace Engineering) Jang Gyu Lee (Seoul National University) Chan Gook Park (School of Mechanical and Aerospace Engineering)
저널정보
제어로봇시스템학회 제어로봇시스템학회 국제학술대회 논문집 ICCAS 2008
발행연도
2008.10
수록면
453 - 458 (6page)

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The main focus of this paper is to design a more accurate optimal/suboptimal fault tolerant state estimator for relative dynamic model representing formation flying of two satellites in low earth orbit (LEO). First of all a mathematical model describing the relative dynamic motion of two satellites in formation is derived and next state estimation based on Kalman filter is emphasized. The measurement system comprises of a RADAR sensor installed on the leader satellite which measures the relative position, azimuth and elevation angle of the follower satellite with respect to reference satellite and carrier phase differential GPS (CDGPS) sensor measuring relative position directly. We have adopted nonlinear system and measurement models and used more advanced nonlinear filtering method called Unscented Kalman filter (UKF) in this paper in pursue of better state estimator in a nonlinear environment. Also we are using more than one sensor to measure same state hence this becomes a multisensor data fusion problem. We implement a federated UKF and apply fault detection and isolation (FDI) algorithms to get a fault tolerant filter. A comparison of Unscented Kalman filter and extended Kalman filter has been made to show superior performance of UKF.

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Abstract
1. INTRODUCTION
2. Relative Dynamic Equations
3. The Unscented Kalman filter design
4. Simulations and Discussions
5. CONCLUSIONS
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