Abstract The small quadrotor aircraft is a kind of unmanned aerial vehicle which is realized by the combination of four rotor blades. The features of quadrotor aircraft are with a simple mechanical structure, easy to control and so on [1]. Along with the continuous development of Unmanned Aerial Vehicle in recent years, the automatic tracking function has been gradually received more and more attention. This design mainly realizes autonomous flight and the human body automatic tracking function of the quadrotor aircraft, positioning of the human body and quadrotor aircraft are obtained by GPS. Because the precision of GPS is not high, in order to overcome this shortcoming, this design proposes the human body tracking based on electromagnetic wave ranging, which greatly improves the accuracy of GPS. The quadrotor aircraft could keep within the accurate human body range. Experimental results show that, when human is walking, quickly walking, jogging and running, the quadrotor aircraft can be maintained between 2–3 m ranges from human.


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