Abstract: This paper investigates the high-order fully actuated (HOFA) anti-disturbance control for a type of actual combined spacecraft with disturbances including input disturbances with unknown parameters and constant external disturbances. First, a generalized discrete-time step backward HOFA model is introduced, and the disturbances are estimated for each of the two disturbances. Then, based on the HOFA system framework, a composite controller based on the disturbance observer is designed, which can not only effectively suppress disturbances, but also obtain a closed-loop system with an arbitrarily assignable eigenstructure. Secondly, complete parameterized forms of the observer gain matrix and the feedback control matrix are established respectively by using the parameterization method. Finally, the proposed method is applied to a type of actual combined spacecraft simulator, and simulation and experimental results fully demonstrate the effectiveness of the proposed method.

Key words: combined spacecraft, discrete-time step backward HOFA models, disturbance observers, anti-disturbance control, parametric design