This section will introduce the experimental results of indoor positioning of four-rotor drones, because GPS can not be used as a reference for real trajectories indoors, and no other sensors can accurately calculate the position of the drone, so this study in ROS, to give the drone waypoint settings as real trajectories.<br><br>Fly 5 in-place take-offs and landings and square paths respectively to calculate the error between visual mileage estimation and set point.<br><br>After the flight, the cumulative error is calculated, the error between the return point and the starting point is calculated, and the average of the five flights is calculated.
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