Conceptual Design And Research On Control Technology Of Autonomous Landing For A Fixed Wing Unmanned Aircraft Vehicle

With the advantages of small size,light weight,good maneuverability,the UAV has been widely used in civil and military fields.The UAV has thus become an important development direction in the field of Aeronautics and Astronautics,facing the world set off the UAV development boom and the rapid development of the international situation and demand growth,China's study on UAV will continue in-depth,this is not only for the domestic UAV industry,but also for the UAV academic challenges.At present,in the whole process of UAV flight,the autonomous flight technology has been more mature,but the take-off and landing technology is still the focus and difficulty of UAV control technology.In this paper,the design of the fixed wing UAV is studied,and the design and Simulation of the longitudinal control system is completed.First of all,this paper has completed a fixed wing UAV design based on the design requirements and related requirements of aircraft design,and use AVL to analysis the fixed wing UAV's aerodynamic characteristics,including the lift and drag characteristics and static stability analysis etc.Secondly,this paper has established the mathematical model of the designed fixed wing UAV,and linearized by the linearized perturbation theory,and also analyzes the longitudinal motion mode of the fixed wing UAV.Then,according to the characteristics and process of UAV autonomous landing,the control strategy is put forward,and the glide path for the fixed wing UAV is designed.Finally,based on the classical PID control theory,the autonomous landing longitudinal control system of the fixed wing UAV is designed,and the Matlab module is simulated and verified by the Simulink module.The simulation results show that the designed control law has good control effect and safe landing for unmanned aerial vehicle can be realized.