V.V. Berezin - Post-graduate Student, Joint Stock Company «Federal research and production center «Nizhny Novgorod Research Institute of Radio Engineering». E-mail: vvb87@yandex.ru A.M. Schitov - Dr.Sc. (Phys.-Math.), Open Joint Stock Company «Federal scientific and production center «Institute of Electronic Measurements «Kvarz» named after A. P. Gorshkov», Nizhny Novgorod. E-mail: schitoff@mail.ru