The main finding this paper is nontrivial and implicit possibility to use well developed mathematical theory of differential equations with delays for solving actual engineering problem of a drone autonomous flight. In this paper we describe correct operation of autopilot for supply correct drone flight. There exists noticeable delay in getting information about position and orientation of a drone to autopilot in the presence of vision-based navigation. In spite of this fact, we demonstrate that it is possible to provide stable flight at a constant height in a vertical plane. We describe how to form relevant controlling signal for autopilot in the case of the navigation information delay and provide control parameters for particular case of flight.
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