Abstract: The problem of fault diagnosis is concerned with respect to the final phase of the satellite autonomous rendezvous. An unknown input observer is designed based on the open-loop system of the C-W equation, and a H∞ controller is designed based on linear matrix inequality (LMI) for the rendezvous. The simulations are implemented under the robust controller and a PD controller with the presence of disturbance. The results show that the robust controller can realize the autonomous rendezvous well, but the observer represents distinctly under different controllers. Finally, conclusions are drawn and a new research topic for rendezvous is proposed.

Key words: rendezvous, fault diagnosis, robust control, linear matrix inequality