The invention relates to the field of flight control of aircrafts, and provides a control method and
system for high-precision tracking of a landing glide line by an unmanned aerial vehicle, and the unmanned aerial vehicle. The control method comprises the steps that S1, a control structure for controlling the height of the
elevator is determined, specifically, a double-ring
cascade PID control structure is adopted, a
pitch angle ring is a PID control structure, and a height ring is a PID control structure; a
lag network is introduced between the
pitch angle ring and the height ring; s2, an accelerator channel adopts a control structure that the air speed is controlled by an accelerator; s3, a landing height instruction and an air speed instruction are obtained, and the unmanned aerial vehicle is controlled to land along the designed glide line track through a control structure for controlling the height through an
elevator and a control structure for controlling the air speed through an accelerator. The
control system comprises a control module for controlling the height of the
elevator, an accelerator control module and a landing glide control module. The method has the beneficial effects that the accuracy of tracking the landing glide track height by the unmanned aerial vehicle is effectively improved, and the safety of the unmanned aerial vehicle in the landing process is ensured.