T.I. Lapina - Ph. D. (Eng.), Associate Professor, Southwest State University (Kursk). E-mail: lapinati@mail.ru D.V. Lapin - Research Scientist, Kursk research institute of Defence Ministry. E-mail: lapindv@mail.ru E.A. Petrik - Ph. D. (Eng.), Associate Professor, Southwest State University (Kursk). E-mail: po-61@inbox.ru