Attitude Analysis Of Four Rotor Unmanned Aerial Vehicle

Today,the four rotor UAV boom has swept all over the world.Four rotor UAV is easy to use,simple in structure,low in failure rate and strong in stability,making it a hot spot for R &D personnel in various countries.Among them,UAV flight control system is the top priority of all R & D.The flight control system changes the external environment through sensors and changes the attitude of unmanned aerial vehicle through the operation of its own data,so that the UAV can change its flight attitude autonomously and steadily.Flight control system is the most important part of UAV flight,and it involves the most extensive disciplines,including electronic,communication,automation and computer.The research of flight control system is a mixture and re innovation of multiple disciplines.This paper first introduces the background and current situation of UAV development,and then introduces the four rotor unmanned aerial vehicle DC motor model,the propeller rotation model,the aircraft nonlinear model,the vehicle rotation model and the system state equation.Next,the hardware system of UAV is selected,and the selection of four rotor UAV motor and propeller is introduced.The most important is the selection of UAV control system.Then the navigation system coordinate system of UAV is established.The process of settlement and control of the attitude angle of unmanned aerial vehicle(UAV)with Calman filter as the core is studied and data fusion is carried out.The simulation experiment is carried out by using PID algorithm and fuzzy self-tuning PID algorithm under the MATLAB environment.The results show that the control effect of the latter is better than the former.Finally,the hardware and attitude performance of the four rotor UAV is tested,and field test of unmanned aerial vehicles is carried out.The four rotor UAV can stabilize flight over20 min and meet the requirements.