Exact trajectory tracking control of automatic landing

The problem of trajectory exact output tracking of non-minimum phase aircraft plant in automatic landing process was studied. The characteristic of aircraft automatic landing process was analyzed. Combined with a feedback controller, the stable inversion control method was adopted to design the automatic landing control law of a commercial jet airplane. The stable inversion calculated the desired control input and desired state trajectory according to nominal aircraft plant model, and the feedback controller deals with the parameter uncertainties of aircraft plant and external disturbance. Based on the relative degrees of aircraft plant, the smooth landing trajectory was also designed to satisfy the comfortable requirement of commercial jet airplane. The simulation results showed that the automatic landing control law had exact output tracking ability, and the automatic landing process met federal aviation administration (FAA) requirements for the category III precision approach landing. The internal dynamic of aircraft was stable and bounded.