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The demand on very high-resolution Earth observation data has steadily increased and the satellite image market has shown substantial growth in past decades. Recently, many private enterprises have formed or plan to form constellations of small satellites to serve various needs. This paper describes the key features of an imaging satellite with resolution better than 0.5 m, SpaceEye-X, which is under...
A recurrent neural network (RNN)-based adaptive attitude controller is developed, which achieves attitude tracking in the presence of uncertain actuator inertia in addition to time-varying, uncertain satellite inertia. The satellite control torques are produced by means of a cluster of variable speed control moment gyroscopes (VSCMGs). The adaptive attitude controller results from a RNN structure...
An adaptive attitude controller for a small satellite utilizing variable speed control moment gyroscopes (VSCMGs) is proposed, which performs integrated singularity avoidance and momentum management using null motion. An adaptive controller yields accurate attitude tracking while the VSCMG null motion achieves singularity avoidance and momentum management. The proposed controller compensates for parametric...
An adaptive robust integrated power and attitude control system (IPACS) is presented for a variable speed control moment gyroscope (VSCMG)-actuated satellite. The developed IPACS method is capable of achieving precision attitude control while simultaneously achieving asymptotic power tracking for a rigid-body satellite in the presence of dynamic uncertainty in the VSCMG gimbals and wheels. In addition,...
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