LQG Controller and Simulation for Three-axis Stabilized Small Satellite

The attitude dynamic model was established for the attitude steady working mode of a three-axis stabilized small satellite.Based on this model,a LQG(Linear-quadrics-Gauss) controller was employed,which is composed of a Kalman filter and a LQ modulator performing as the states estimator and an optimal controller respectively.The estimated attitude states were generated by Kalman filter based on the measurement from sensors,and the feedback-gain matrix was obtained by the modulator,utilizing the estimated states.The control torque was generated by three flywheels and the whole simulation model was also obtained.The numerical simulation results indicate that the LQG proposed could achieve the high level accurate attitude determination and fast steady control for this attitude control system,and perform well under the disturbance.