Research On Guidance Technology And Attitude Control Of The UAC

The unmanned aerial vehicle has received the widespread attention in battlefield since Gulf War in 1990 s,the various countries' scholar competed for putting the high technology and new technology which had some relation with the field of unmanned aerial vehicle,into the development of the unmanned aerial vehicle.The unmanned aerial vehicle has turned the role gradually from detecting and warning to a fighter that has strong ability of attacking.this kind of transformation make the technology of unmanned aerial vehicle guiding especially to be more important.While no mater in the mode of cruise or under the pattern of pursuiting goals,the unmanned aerial vehicle attitude control always attract widespread concern.This article based on the above background,has studied unmanned aerial vehicle guiding technology separately based on the proportion algorithm and the control method for attitude system which based on the Backstepping law.This article main research content:1.Establishes the polar coordinates of the unmanned aerial vehicle and the target in the airspace.According to the unmanned aerial vehicle characteristic of independent attacking,proposed the concept of effective attacking range in the mode of generalized proportional navigation law.Based on this effective attacking range,the model of generalized proportional navigation can be improved successfully.Simultaneously calculated the value of proportion parameter by using optimal control theory,and then obtained the best proportional operator.It also discussed the convergence of the guidance algorithm.2.In the second part,this paper has applied the fuzzy control into the guiding technology for unmanned aerial vehicle.We designed the fuzzy controller according to the thought of proportional guiding algorithm.This controller is mainly responsible for generating control command.The command could control the unmanned aerial vehicle to track the target.With the fuzzy controller,it has avoided the difficulty that brought by establishing the precise mathematical model.The fuzzy logic also can guarantee the guiding system has the good robustness.3.Regarding the unmanned aerial vehicle attitude control,we need to establish the angular motion system and the dynamic system and use the method of backstepping to design the control law for the attitude system.This law enables the unmanned aerial vehicle attitude system to be stable in the point of zero balance.In this way,the deviation angle could converge to zero,which generated because of the unmanned aerial vehicle deviated thepredetermined trajectory.The control purpose is that make sure the unmanned aerial vehicle could finish the mission in the fixed path.