Research Of The Longitudinal Control System Of The Automatic Carrier Landing Of UAVs

Landing control of carrier-based airplane has been hailed as“ dance on the tip”.It requires the aircraft can still be accurately landed in a predetermined area in extreme environments, which is a very complex difficult control problem, while it is a high risk factor project. In order to study the key technology in the Aircraft landing control,the problem of UAV longitudinal landing control is studied.. The main work is as follows:1) A UAV research is made, the UAV accurate mathematical model under the relevant assumptions is built. Because of UAV’s nonlinear, strong coupling features the final linear UAV model is given by the method of linear small disturbance theory.2) Then the UAV landing environment has been systematically analyzed,including interference characteristics of carrier in the complicated sea conditions which lead to carrier’s three freedom motion and turbulence. Finally the mathematical model for the simulation of ship environment is obtained.3) The all-weather automatic carrier landing system(AWCLS) and the role of the four kinds of work mode. will be studied. According to the height control design of UAV automatic carrier landing system(ACLS). First, PID algorithm is used to fulfill the UAV longitudinal height tracking control design, then build simulation model complete the entire simulation in the SIMULINK environment. Finally, in order to cope with the limitation of PID algorithm to the deck motion and stern spoiler,a robust controller will be designed, the augmented model of UAV longitudinal control system is established, using LMI toolbox to solve the state feedback controller. The simulation in MATLAB will be given and be proved that the robust controller has better performance.