Abstract: For onorbit autonomous servicing, the relative position and attitude of anear satellites should be controlled accurately. Considering the coupled relation between the relative position and attitude, coupled attitudeorbit dynamics model is established. The deputy satellite is required to close to and finally move around the chief satellite in the task. The expected relative position and attitude are discussed. A control law combined the relative position and attitude is proposed to realize the task requirement. The numerical simulation results show that the control law can overcome the disturbance effects between the relative position and attitude, and finally ensures that the deputy satellite points to and moves around the chief satellite precisely.

Key words: relative coupled attitude-orbit dynamics, pointing task requirement, Lyapunov min-max control