The Study Of Civil Aircraft Auto-landing Control System

As great benefits are got from the application of automatics flight control on the civil aircraft, especially during take off and landing, more and more attention is paid to the application and development of automatics flight control technology. AFCS (automatics flight control system) is the base that precision control of the modern high technological aircraft, and be the best way to obtain greatness business profit, at the same time ensure society benefit.The thesis adapts intelligent PID and fuzzy control theories to study the civil aircraft's flight control law during landing.Firstly, the civil aircraft mathematic model is built. After we get nonlinear differential equations, we linear the equations according to feature of flight and demand of the simulation to get the linear pitching equations and lateral equations which is a brief mathematic model.Secondly, the thesis introduces the component of FCS(flight control system) and ILS(instrument landing system), and how to operate. By researching and appling the theories and means of traditional PID, intelligent PID control and fuzzy control, the auto flight controller of pitching control channel and lateral control channel are designed.Lastly, according to the mathematic model and feature of aircraft landing, pitching fuzzy controller and pitching fuzzy-PID controller are designed. Then, the controller is simulated using MATALAB.Simulation results prove that the controllers are availability.