Background, compared with the traditional unmanned aerial vehicle (UAV), the quadrotors are rapidly growing in popularity, and have become a standard platform for robotics research worldwide. The directional and orientation of the quadrotor is key technologies for rescue, surveillance, and environmental monitoring. Materials and Methods, this article provides a vision orientation system based on monocular vision technology to compensate the deficiencies of positioning the quadrotor by global position system (GPS). A monocular ground camera and a ground station were applied to calculate the position and directional of the quadrotor. Results, the image of the quadrotor captured by the camera and the information from the ultrasonic sensor installed on the quadrotor was processed by the ground station the current coordinates and heading angle of the quadrotor can be obtained immediately. Conclusions, The ground station can set the target coordinates of the quadrotor by sending the commands which contain the information of the target coordinates and heading angle to it. Main conclusions, the experimental results show that the method is highly accurate and feasible.
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