Anti-windup control for non-cooperative spacecraft rendezvous system with sensor fault

This paper investigates the control of non-cooperative spacecraft rendezvous system with sensor fault, actuator saturation and external disturbance. First, based on the second-order fully actuated system model of the non-cooperative spacecraft rendezvous system, a state observer is introduced to reduce the influence of sensor faults on the system stability. In order to solve the problem of actuator saturation, an anti-windup compensator is designed. Then, based on the designed observer and anti-windup compensator, an anti-windup controller is designed by combining with fully actuated system approach, fault-tolerant control, and integral sliding mode control. And the stability analysis is given. The main advantages of the proposed methods are: a second-order fully actuated system model is established to avoid the complexity of converting an inherently second-order system into a first-order form. In addition, since the model established does not require linearization processing, the model description is more accurate, and the steady-state error of the control system is smaller. By using the fully actuated system method to design the controller, as long as the high-order fully actuated system model of the system is provided, the controller can be directly designed, which simplifies the design steps of the control system. And the designed controller eliminates the nonlinear terms of the system, reducing the complexity of the stability analysis for the closed-loop system. Finally, a numerical simulation example is provided to show the usefulness of the method.