E.A. Antokhin1, A.A. Zalishchuk2, V.A. Nenashev3, S.А. Nenashev4

1-4 St. Petersburg State University of Aerospace Instrument Engineering (St. Petersburg, Russia)

1 fresguap@mail.ru; 2 sacha1501@yandex.ru; 3 nenashev.va@yandex.ru; 4 nenashev_sergey178@mail.ru