Uav Automatic Landing Vertical Control Technology Research

In recent years the developments of Unmanned Aircraft Vehicle (UAV) in the world flourish, various uses of UAV are vigorously developed in the world. UAVs have many advantages that manned aircraft unmatched, dependence on manned aircraft is difficult with competent, but also there are many problems to be solved. One of its key technologies is the safety of landing recovery after completing its mission, precise control law designed for the safety of automatic landing is essential.This paper first established a non-linear mathematical UAV model of six degrees of freedom, and a detailed analysis of its dynamic characteristics and dynamic response curve. Followed, in accordance with the object of landing systems, the quality of the landing phases and performance requirements were listed. Finally paper detailedly design the process of automatic landing trajectory.Then, classic PID control methods were designed with the slow response to control law, vibration and other phenomenon, a method based on switching the ratio of output of the self-adjusting fuzzy controller was designed. Simulation results showed that the method was effective realized on the tracking control, and had a good dynamic and static performance. At the same time by joining random interference, the robust stability of the system was verified.Finally, various kinds of interference may be encountered in the course of auto landing were introduced. And then paper designed H_∞and H₂ controller to against uncertain systems and white noise interference. At last hybrid H₂/H_∞robust control the condition with theexistence of two kinds of interference at the same time, the automatic landing can still meet the performance targets.