A mathematical model of fixed-wing UAV was established by selecting the geocentric inertial coordinate system, and the longitudinal and lateral motion equations of UAV were obtained by the small perturbation linearization method, and the attitude solution method was given. The PID controller with four control loops of roll, pitch, yaw and altitude is designed, and the PID controller is simulated and analyzed by MATLAB, and the fixed-wing UAV flight control system is designed and built based on Arduino platform. After testing, the flight control system can accurately control the UAV flight under the modalities of constant height and self-stabilization.
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