Control of aircraft landing using the dynamic inversion and the H-inf control

The paper focuses on the automatic control of aircraft in the longitudinal plane, during landing, by using the literalized dynamics of aircraft, taking into consideration the wind shears and the errors of the sensors. The H-inf control provides robust stability with respect to the uncertainties caused by different disturbances and noise type signals, while the dynamic inversion provides good precision tracking. A new robust automatic landing system (ALS) is obtained by means of the H-inf control, the dynamic inversion, optimal observers, a dynamic compensator and two reference models providing the aircraft desired velocity and altitude. The theoretical results are validated using numerical simulations for a light aircraft landing; the simulation results are very good (Federal Aviation Administration accuracy requirements for Category III are met) and show the robustness of the algorithm even in the presence of wind shears and sensor errors.