Abstract:Considering that the external disturbance and the actuator failures exist in the missile flight system, this paper employs a robust incremental nonlinear dynamic inversion-based passive fault tolerant control method, not only to avoid the computational burden caused by active fault diagnosis but to realize safety and reliability of the control algorithm. For system uncertainties such as external disturbance and actuator failures, the missile three-channel attitude control model is given, and a terminal sliding mode control law is designed with the uncertainties estimated and compensated by a disturbance observer. To further enhance robustness of the missile attitude control system, a missile incremental dynamic inversion robust attitude control law is established and combined with the terminal sliding mode controller based on disturbance observer to construct the robust fault tolerant control law. Afterward, the residuals of the control systems are contrasted and the typical attitude tracking simulation shows that the employed controller can maintain the control performance and fault tolerant ability without fault information, ensuring robustness and precision of missile attitude control.