Three Axis Attitude Control of RASAT by Magnetic Torquers

Spacecraft magnetic attitude control has been largely investigated, but the focus has generally been the control of satellites meeting conditions of gravity gradient stability by either inertia parameters or deployed boom. In this study, we consider three axes magnetic control for Turkish earth obse...

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Bibliographic Details
Published inLecture notes in engineering and computer science Vol. 2235/2236; p. 265
Main Authors Acar, Yusuf, Yavuzyilmaz, Cagatay
Format Journal Article
LanguageEnglish
Published Hong Kong International Association of Engineers 04.07.2018
Subjects
Airborne/spaceborne computers
Computing time
Control stability
Economic conditions
Feedback control
Gravitation
Inertia
Magnetic control
Mathematical analysis
Matrix methods
Physical properties
Pitch (inclination)
Polar orbiting satellites
Satellite observation
Satellites
Spacecraft attitude control
State feedback
Three axis
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Summary:Spacecraft magnetic attitude control has been largely investigated, but the focus has generally been the control of satellites meeting conditions of gravity gradient stability by either inertia parameters or deployed boom. In this study, we consider three axes magnetic control for Turkish earth observation satellite, RASAT. This satellite is significant case study for magnetic control problem since it does not meet gravity gradient stability conditions on pitch axis owing to physical properties such as greater inertia along z axis than x axis. However, near polar orbiting satellites’ pitch axis is controllable under magnetic torques. On the other hand, the controller is supposed to be simple to consider computational efficiency of onboard computer. For this reason, state feedback control methodology is applied. However, the significances of the controller are that the controller gain matrix is constant and its calculation is based on linear quadratic law with averaging method of slowly time varying system. Furthermore, this approach can be extended to control off-nadir attitude.
ISSN:2078-0958
2078-0966