Based On The Decimetric Guided Uav Automatic Takeoff And Landing

According to the up-to-the-minute technologies of high aspect ratio tailless UAV (Unmanned Aerial Vehicle), considering the characters of the take-off and landing and the difficulties of the design of automatic take-off and landing control system of these UAV,the thesis solves a series of key technologies as follows:building the UAV taxiing model and analysing it,designing the integrated control system of taxiing direction, guidance and controlling of high precision approach and landing, integrated control technology of the engine,data fusion of sensor. The UAV automatic take-off and landing simulation model is built in MATLAB/SIMULINK. The whole process of take-off and landing are simulated. The main contributions are as follows:1. A document review is made to analyse the present status and trend of main take-off and landing methods. The basic design process of UAV automatic take-off and landing control system is introduced. The significance and background of the thesis are explained.2. The digital simulation model of the UAV that take-off and landing with wheels is built. The model is made up of the 6 degree-of-freedom UAV model,landing gear bumper elastic model, tire elastic model,trailing wheel brake model, nose wheel steering model,centimetric wave ILS(Instrument Landing System) model,wireless RAS(Radio Altimeter Sensor) model, and wind model. The models mentioned above are analysed in the thesis.3. Automatic take-off and landing control system based on centimetric wave ILS guidance is designed in MATLAB/SIMULINK environment by classical control system design method. And at the same time,transient jump during control law' switch is discussed.4. Automatic take-off and landing control system in wind turbulence is studied and the problem of decrab maneuver is mentioned.5. Nonlinear simulations of UAV take-off and landing with wind and without wind are implemented and the control effect is analyzed.The nonlinear simulations show that the control system can make the UAV take off and land automatically, and the attitude is stable and gentle.The design requirement...