Attitude and Deformation Estimation of Flexible Satellite Using Magnetometer and Sun Sensor

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Ghani, Marzieh | 2017

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 50241 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Asadian, Nima
Abstract:
The estimation of attitude and deformation of a flexible satellite using magnetometer and sun sensor data are studied in this thesis. To this end, the dynamical differential equations of the flexible satellite have been derived using Lagrange’s equation. These equations of motion are then utilized for the purpose of simulation and verification. After introducing the measurements equations, the observability of the satellite with flexible panels has been evaluated. Afterward, the attitude of the satellite body and deformation of the flexible panels have been estimated by EKF (Extended Kalman Filter) as well as UKF (Unscented Kalman Filter). The results show that the estimations using UKF are more accurate, but its computational time is much more than EKF. Finally, the effect of flexibility on the accuracy of estimation has been investigated. The results have demonstrated that ignoring flexibility in modeling and estimation may results in 8 times larger errors in satellite attitude estimation
Keywords:
Flexible Satellites ; Extended Kalman Filter ; State Estimation ; Attitude Estimation ; Unscented Kalman Filter ; Sun Sensor

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