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Finite-time Attitude Coordinated Control for Spacecraft Formation Flying Using Consensus Algorithm

For the spacecraft formation flying system with unknown external disturbances and model uncertainties, a finite-time attitude coordinated control law is proposed based on consensus theory. Firstly, a disturbance observer is developed to estimate generalized disturbances consisting of external disturbances and model uncertainties, which can guarantee the estimation errors to converge to zero in finite time. Secondly, a novel nonsingular fast terminal sliding mode attitude cooperative controller based on the finite-time disturbance observer is designed to ensure that the attitude errors of the system converge to zero in finite time. Finally, simulation results are come out to demonstrate the effectiveness of the proposed control law.