N.A. Usov - Ph.D. (Eng.), Senior Lecturer, Air Force Military Educational Scientific Center «Air Force Academy named after Professor N.E. Zhukovsky and Yu.A. Gagarin» (Voronezh). E-mail: nauvrn@rambler.ru

N.A. Usov1 

1 Military Academy of Communications name after Marshal оf the Soviet Union S.M. Budyonny (St.-Petersburg, Russia)