V.P. Koryachko - Dr. Sc. (Eng.), Professor, Ryazan State Radio Engineering University. E-mail: koryachko.v.p@rsreu.ru D.A. Perepelkin - Ph. D. (Eng.), Associate Professor, Ryazan State Radio Engineering University. E-mail: dmitryperepelkin@mail.ru M.A. Ivanchikova - Post-graduate Student, Ryazan State Radio Engineering University. E-mail: ivanchikova.masha@yandex.ru