Event-driven fault-tolerant attitude tracking control of spacecraft for noncooperative target interest surface

This paper explores the problem of relative attitude stabilization between a noncooperative target interest surface (NCTIS) and a bandwidth-restricted spacecraft subjected to parameter uncertainties, exogenous disturbance, actuator faults, and input saturation. The proposed angular velocity estimator provides the rotational angular velocity of NCTIS. The proposed control scheme uses a dynamic surface control framework with the finite time disturbance observer to attenuate multi-source disturbances, and it deals with the restricted communication resources by employing a dynamic event-triggered mechanism. The presented scheme relaxes the prior upper bound of total disturbance and improves the traditional event-triggered technique. Stability analysis shows the ultimate uniform boundedness of the closed-loop system's state trajectory. In addition, the Zeno-free behavior can be guaranteed in the design. Comparing numerical simulation results with advanced techniques shows the effectiveness of the proposed scheme.