Design And Control Of Solar Powered UAV Against Crosswind In Landing

Because of its long cruising time,high flying altitude,wide coverage and low cost,the solar unmanned aerial vehicle(UAV)has an extremely broad development prospect in military and civil fields.However the large wingspan and low velocity make the landing control performance poor,in the case of a strong side wind.Therefore,it is very important to design a lateral guidance control system with strong robustness and stability against the side wind condition.Firstly,in order to facilitate the research,the mathematical model of the sample solar UAV was established.According to the small disturbance linearization method,the horizontal lateral linear state equation was got.Then,the characteristics and the operation stability characteristics of the solar UAV were analyzed using Matlab software.Whats more,the influence of crosswind on the operation characteristics of the UAV was also analyzed.Secondly,the algorithm of the attitude calculation for the solar UAV was studied.The basic characteristic of MEMS inertial sensors was analyzed.The complementary filter algorithm and extended kalman filtering algorithm for multi-sensor information fusion were studied and compared using the Matlab software.The precise attitude information was provided for the design of controllers and a follow-up work.Then,the solar UAV lateral guidance strategies were studied,this paper expounded the defects of common guidance strategy,put forward a guidance strategy based on vector field,the simulation results showed that this strategy in crosswind environment performed a better trajectory tracking effect.Finally,the problem of lateral control for solar UAV landing was studied.The control strategy of anti-interference to the rolling loop and course loop were proposed for the control demand of the lateral direction when the solar UAV landing.At last,the rationality of the control strategy for the solar UAV landing was verified using Matlab software.