Review and classification of methods for implementing UAV control channel

The article considers methods for implementing control channel between ground control station and unmanned aerial vehicle. Classification methods were formulated based on the bibliographic research method: wired, wireless. Existing methods implemented in commercial control systems are considered. A comparative analysis of tethered drones was carried out according to the following criteria: aerodynamic configuration of an unmanned aerial vehicle, payload height and weight, maximum wind speed unmanned aerial vehicle can withstand, system deployment and disintegration time, and tasks performed by the unmanned aerial vehicle. A comparative analysis of common radio control systems presented by Frsky, Spektrum, Flysky, Hitec and ELRS is carried out. The components of the radio wave control channel, consisting of modulation, coding and carrier frequency selection, are considered. Methods for a control channel implementation using atmospheric communication lines are presented.