Study on Automatic Landing of Civil Aircraft Based on LADRC

Active disturbance rejection control (ADRC) is an advanced control technology, which does not depend on the precise model of the controlled object and can deal with external disturbance effectively. Therefore, in order to solve the errors of glide path and flight path caused by wind disturbance during the automatic landing of civil aircraft, ADRC can be applied to the system. The second-order cascade LADRC systems of longitudinal and lateral directions are designed respectively, in which the attitude angle control is designed for inner loop and the position control is designed for out loop. The simulation shows that both cascaded LADRC and PID controllers have a certain inhibitory effect on wind disturbance. While the LADRC controller has smaller overshoot, stronger robustness, stronger course keeping ability and anti-interference ability. And the parameters of LADRC controller need to be adjusted are not too many, which meets the actual engineering requirements.