Lateral flight control method of UAV based on small disturbance and root locus theory

The flight control is the key technology for the unmanned aerial vehicle(UAV), which can ensure the flight security of UAV. Compared with the longitudinal motion, the lateral motion mode and frequency domain characteristics of the UAV are much more complex, which makes the design of lateral flight controller more challenging. Therefore, the lateral flight control method of UAV is designed based on small disturbance and root locus theory. Based on the coupled nonlinear motion model of UAV, the longitudinal and lateral small disturbance motion equations are obtained by using decoupling grouping and small disturbance linearization strategy. The lateral motion mode and lateral frequency domain characteristics of UAV are analyzed, and the lateral flight control law based on small disturbance and root locus theory is designed by using root locus and PID control theory of classical control theory. Finally, the UAV flight control simulation experiment is carried out to verify the effectiveness and superiority of the proposed method.