A.K. Stroev - 2-nd Category Engineer, JSC «Academician A.L. Mints Radiotechnical Institute» (Moscow); Post-graduate Student, MIPT (SU). E-mail: astroev@rti-mints.ru D.V. Yatskin - Specialist, JSC «Academician A.L.Mints Radiotechnical Institute» (Moscow); Post-graduate Student, MIPT (SU)