Enhanced Extended State Observer Based on Trajectory Linearization Control for External and Internal Disturbances

This paper proposes a novel hybrid control framework by combing enhanced extended state observer (EESO) with trajectory linearization control (TLC) for air-to-air missile acceleration tracking problem. First, based on the tracking error dynamics derived by Taylor expansion for the original nonlinear system along the desired trajectory, a feedback linearization (FL) based control law is designed to stabilize a linear time-varying (LTV) system. To reduce the controller performance sensitive to uncertainties, with partial model information, EESO is constructed to estimate the tracking error vector, as well as the uncertainties in an integrated manner. The closed-loop stability of the system under the proposed compound scheme is established. Both numerical simulation studies and an application example of missile acceleration autopilot design demonstrate the feasibility and efficacy of the proposed method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .