The Research Of Carrier Landing Control Of The Flying-wing UAV

As the high tracking precision, great control difficulty and much disturbing factors, carrier landing has always been a core difficulty for flying-wing UAV. Together with poor lateral stability and low longitudinal control efficiency caused by the special aerodynamic configuration, carried landing of flying-wing UAV is known for accidents. Based on the comprehensive study of key techniques of carrier landing, dynamic landing trajectory and control law of flying-wing UAV were designed, which settled the guidance and control problems of designated carrier landing.Under the condition that the influence of aircraft carrier motion on landing point was analyzed precisely, by consulting landing trajectory and control requirement of manned carrier-based aircraft and target carrier-based UAV’s aerodynamic performance, controllability, maneuverability and modal characteristics, landing trajectory of flying-wing UAV containing of approach level, glide-down, and deck motion compensation was designed, which achieves dynamic tracking of landing point.Based on the requirements of landing trajectory tracking and normal acceleration and pitch rate control, altitude keeping controller, choosing C* as its inner loop control variable, was designed by using RSLQR-L1 control method, which get high height tracking accuracy. Facing with the problems of coupling property and course instability, coupling compensation mechanism and stability augmentation control law were designed. Base on which lateral trajectory tracking controller, choosing roll angle as its inner loop control variable, were figured out by using RSLQR method, which settled the lateral trajectory tracking problem. According to the influence on landing accuracy of landing point motion caused by the disturbed motion of aircraft carrier, this paper proposed landing point vertical motion compensation network which improved the tracking accuracy of deck compensation phase and success rate of carrier landing.In the end of this paper, numerical simulation environment of landing phase was built with Matlab software. On this condition, simulations of model uncertainties, atmosphere wind field, motion of carrier aircraft, vertical motion of deck etc. indicated that motions of carrier aircraft has little effect on landing trajectory of flying-wing UAV, controllers figured out satisfies the robustness, accuracy and rapidity requirements of autonomous carried landing system.