Design Of Automatic Carrier Landing Control System Base On Nonlinear Geometry Thoery

In this paper,the geometry is adopted.After analyzed carefully,we recover,the equations of motion of the Fly Object has a special form called the block diagonal nonlinear system (BDNS).To this kind of system,by using the concept of feedback linearization and relative degree(RD),a theorem called RD decomposition is proposed.Base on this theorem,a new design method can be used not only in the SISO's BDNS,but in the MIMO's square matrix BDNS(numbers of input equal ones of output).Then,it is naturally to design a flight control system by BDC method.therefore,for using this method,analytic inverse solutions of each nonlinear equation or each series(MIMO system) are needed.In this paper,the analytic inverse solutions of equations of motion of a aircraft are given.Base on the block diagonal nonlinear system and the theory of the block diagonal controller, and the aircraft were analyzed carefully.Then,the longitudinal motion equations of aircraft were transformed in diagonal form.And the inverse-analytic solution of longitudinal motion equations were given.In order to make the aircraft land on carrier precisely,the BDC was used to design the longitudinal automatic carrier landing control system.In this paper,we discuss the air disturbances including some level of parameter of the atmosphere and cocktail airstream and make a simulation of fly control system.The mathematical simulation shows that the BDC has achieved the performance specifications of the design and the robustness is so good.