The problem of reconfiguration for fleets of satellites subject to persistent disturbances and under input saturation and coordination accuracy constraints has been addressed. The proposed control scheme is based on a bank of controllers composed by primal LQ control laws and nonlinear command governor (CG) units. The LQ controllers compensate the system without taking into account the presence of constraints whereas the CGs are used to generate a suitably modified version of the reference signal, capable of producing evolutions that fulfill the constraints at each time instant. A supervisory unit has been presented, capable of switching between the CG units of the bank, according to the attitude of the satellites. Finally, the algorithm has been applied to reconfigure an Earth observing system, forcing two satellites to cover a pre-specified trajectory defined with respect to a third one, fulfilling on it some accuracy constraints and preventing input saturation from occurring.
Hybrid constrained formation flying control of micro-satellites
2006
6 Seiten, 4 Bilder, 14 Quellen
Conference paper
English
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