Research On Flight Attitude Control System Of Agriculture Remove Sensing Fixed-Wing UAV

In recent years, more and more agricultural producing area are trying to use unmanned aerial vehicle for crop growth monitoring with the modernization of agricultural. Compare to the other monitoring methods, the unmanned aerial vehicle has advantages on these aspects such as high efficiency, low costs, safety and environmental protection. The mainly use d types of unmanned aerial vehicle are the multiple rotor and helicopter ones, which improve the efficiency of monitoring to some extent, but they still have deficiency compare to the fixed wing ones. The fixed-wing unmanned aerial vehicle has the features of low altitude low speed, high dead weight capacity, high stability and reliability and long duration of flight, which can make up the for the weakness of low dead weight capacity and short flight duration of the multi rotors ones. It has a practical significance towards the efficiency improvement and cost saving. To use an agricultural unmanned aerial vehicle to effective and safe carry out all kinds of flight mission, an accurate control is needed towards the flying attitude.The essay takes the fixed-wing unmanned aerial vehicle as an experimental platform, based on the flight control system to raise the overall technical architecture of unmanned aerial vehicle’s attitude flight control system and conducts a further research. The essay firstly takes the aerofoil as the calculation model and the fluid mechanics analysis software —fluent as computing method to analyze the aerodynamic characteristics of the experimental unmanned aerial vehicle and get an aerodynamic parameter. The unmanned aerial vehicle is proved to have good aerodynamic characteristics and meet the experimental demand of the essay after the analysis on the parameter. Secondly, according to result of analysis and the vehicle’s parameter and combine with the six degrees of freedom motion equations in the flight control theory, the essay works out a longitudinal movement and latitude movement model through the linearization modeling method on the min-disturbance principle. On the base of the dynamic model, a design is conducted using Fuzzy PID strategy on the flight control system in terms of control loop of the pitching angle, height, rolling angle and yaw angel. Lastly, we got the conclusion through the simulation of all kinds of designed control loop under the Simulink environment to get the step response curve that: the system is stable and quick responding, which shows the feature of strong robustness.The practical applicability and stability of the unmanned aerial vehicle’s attitude flight control system has been proved during the real flight experiment. The test site is selected to be the open space on the dyke of Songhua River in Qunli new district in Harbin. The data transmission module sent back the attitude data after the actual flight with route planning. With the collation and analysis of the experiment data, the unmanned aerial vehicle is proved to have strong controllability and anti-jamming ability. It provides a technical foundation for the agricultural unmanned aerial vehicle to complete flight mission accurately and safely.