I.V. Zlobina - employee, Yuri Gagarin State Technical University of Saratov. E-mail: @irinka_7_@mail.ru N.V. Bekrenev - employee, Yuri Gagarin State Technical University of Saratov. E-mail: nikolaj.bekrenev@yandex.ru

E.R. Zhdanov1, A.V. Volkov2, A.V. Kryukov3, K.A. Tsvetkov4

1 FSBEI of HE “MIREA – Russian Technological University” (Moscow, Russia)

2-4 JSC “Central Scientific Research Radio Engineering Institute named after Academician A.I. Berg” (Moscow, Russia)

1 zhdanov@ufanet.ru; 3 minyyc@yandex.ru