E.S. Kolesnikov - Ph. D. (Eng.), Deputy Head of Department, Military Educational and Scientific Center «Zhukovsky-Gagarin Air Force Academy» (Voronezh). E-mail: esk74@rambler.ru A.A. Lavrov - Dr. Sc. (Eng.), Professor, Research Scientist, JSC «International air navigation system». E-mail: lavrovacad@gmail.com