The Research Of Carrier Landing Control Of The Flying-wing UAV

Carrier is the main combat force of modern carrier battle group,With the technical development and battlefield mission requirements,equipping UAV for aircraft carrier become an inevitable trend.Severe landing environment and the six-degree-of-freedom disturbance motion of the deck make the process of carrier landing become the most dangerous stage in the entire flight.Aiming at the control of the flying wing UAV during carrier landing,This paper studies the automatic landing control and guidance technology,and realizes safe and reliable carrier landing.According to the relative motion between the aircraft and the carrier,the relative motion model is established by applying the relative motion theory,and the accurate mathematical description of relative trajectory motion and relative attitude motion is given.Combined with the dynamics characteristic of UAV,the lateral stability augmentation control is designed based on the fusion of the rate of change of sideslip angle,which solve the problem of the yaw unstable characteristic.After analyzing the effect of the angled deck on the lateral trajectory tracking of landing,the control law of the lateral trajectory tracking based on the principle of robust servo is designed to enable the aircraft to accurately track the angled deck.The decoupling control strategy of attitude and trajectory is developed to solve the coupling problems of the attitude and trajectory caused by the aircraft tracking the carrier movement at the end of landing.With the application of the adaptive dynamic inversion theory,the relative pitch angle control law and the relative height control law based on dynamic pressure are designed,which realize the high-precision tracking of the relative trajectory and efficiently restrain the effect of the pitching motion and vertical motion on landing trajectory tracking to guarantee the safety of landing.The entire flight of carrier landing is simulated in Matlab /Simulink.The results verified that the landing control law and guidance law has strong anti-disturbance ability,and can resolve the adverse effect of the stern airflow field during landing and meet the control requirements of safely landing.