Constrained Attitude Control of Uncertain Spacecraft With Appointed-Time Control Performance

This article studies the appointed-time attitude tracking control of spacecraft on special orthogonal group, with forbidden zone, parameter uncertainties, and external disturbances. A novel projection function is proposed, such that normalized boresight vector sensitive instrument mapped to a reduced dimensional in Euclidean space. If uniformly bounded, constraint zone will be satisfied at all time. By virtue designed associated auxiliary vectors, set vector-based error functions, performance constraints, according switching law carefully constructed. The proposed adaptive scheme ensures can satisfy simultaneously, presence uncertainties Simulation results show effectiveness scheme.