Integrated Attitude-Orbit Control for Spacecraft With Prescribed Performance via Fully Actuated System Approach

This paper addresses the integrated attitude-orbit control problem with prescribed performance for spacecraft subject to external disturbances, parametric uncertainties, and input saturation. Firstly, a twistors-based mathematical model with performance constraints is established, which is then transformed into an equivalent unconstrained form using a prescribed performance function. Then, the external perturbations and parametric uncertainties are unified as a lumped disturbance, which is accurately estimated and compensated by a developed extended state observer (ESO). An auxiliary system is designed to mitigate the adverse effects of input saturation. Subsequently, a prescribed performance control strategy based on the fully actuated system (FAS) approach is proposed. The stability of closed-loop system is rigorously guaranteed through the Lyapunov-based stability analysis. Finally, comparative numerical simulations demonstrate the effectiveness and superiority of the proposed control strategy.