High stability attitude control for flexible satellite based on frequency-domain analysis

Considering external disturbances and flexible vibration, a scheme for satellites high stability attitude control and its parameter tuning method are presented. Traditional PD controller was applied to realize attitude stabilization combining with the disturbance compensator. The disturbance compensator was designed using robust model matching principle. By reducing the magnitude-frequency response from disturbances to angular velocities, the attitude stability was improved. Transfer function models were provided according to the flexible effects being regarded as generalized disturbances or not, respectively. Then the frequency characteristics of the system were analyzed through frequency domain method to demonstrate the effectiveness of the disturbance compensator. And it is proved that the system can reach robust stability. Simulation results show that the attitude control strategy effectively improve the precision and stability and suppresses the flexible vibration. The proposed method is easy to achieve and suitable for engineering application.