High-order fully actuated anti-disturbance control for a type of combined spacecraft based on disturbance observer

This paper investigates the High-Order Fully Actuated (HOFA) anti-disturbance control for a type of actual combined spacecraft, in which disturbances include 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, the complete parameterized forms of the observer gain matrix and the feedback control matrix are established by using the parameterization method. Finally, the proposed method is applied to a type of actual combined spacecraft simulator, and the simulation and experimental results fully demonstrate the effectiveness of the proposed method.