Design of Lateral Three-Loop Autopilot with Pseudo-Angle of Sideslip Feedback Based on Active Disturbance Rejection Control

The lateral linear control model of missile is established and the symbol definition of lateral aerodynamic transfer function is given in this paper. And the frequency domain characteristics of the lateral airframe are analyzed in the low, middle and high frequency band, respectively. Combined with the active disturbance rejection control method, a lateral three-loop autopilot based on linear active disturbance rejection control is proposed. Through the dynamic estimation and compensation of the extended state observer, the robustness to the system uncertainty is enhanced. Simulation results of different cases demonstrate the effectiveness and robustness of proposed autopilots and lateral active disturbance rejection three-loop autopilot is more robust.