Yu.E. Korchagin - Dr.Sc. (Phys.-Math.), Associate Professor, Voronezh State University E-mail: korchagin@phys.vsu.ru К.D. Titov - Engineer, MTSC Air Forces «MAA named professor N.E. Zhukovsky and Y.A. Gagarin» (Voronezh) E-mail: titovkd@gmail.com