This work considers the principles of designing of the new generation of tethered high-altitude telecommunication platforms. A set of theoretical and engineering problems for the development of technology and a system for ground-to-aircraft transmission of high-power energy based on the development of the principle of resonance highfrequency energy transfer by N. Tesla is formulated; of the development of a highly reliable unmanned vehicle for long-term use; of the development of a local navigation system that provides high positioning accuracy and increased noise immunity compared to satellite navigation systems, etc.