Autonomous Orbit and Attitude Estimation of Satellite Using Star Sensor and Earth Sensor

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Hosseini Moghaddam, Mohammad Hossein | 2016

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 48386 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Ghanbarpour Asl, Habib
Abstract:
In this Thesis, attitude and orbit of a satellite is estimated using a star sensor and an earth sensor. An algorithm has been developed to estimate satellite attitude and orbit that can be implement on a satellite as strap-down hardware. This system has an uncomplicated implementation compared with platform based systems. That mentioned algorithm estimates satellite orbit by using identified star vectors via star sensor and identified earth vector via earth sensor simultaneously. It also knows the stars vectors according to Star Catalog. Attitude estimation is also executed using both star and earth sensor. It has to be said that an Unscented Kalman Filter synthesize both sensors output data and estimates the satellite’s attitude and orbit. Finally, attitude and orbit estimation via this algorithm leads to satisfactory results
Keywords:
Nonlinear Kalman Filter ; Unscented Kalman Filter ; Star Sensor ; Horizon Sensor ; Autonomous Attitude and Orbit Estimation ; Autonomous Estimation

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