A.V. Denisov - Ph. D. (Phys.-Math.), Department «Radio Engineering and Telecommunications», Associate Professor, Peter The Great St.Petersburg Polytechnic University. E-mail: A.V.Denisov@inbox.ru M.A. Belyansky - Ph. D. (Phys.-Math.), Head of Department, SC «ZASLON». E-mail: maxim_belyansky@mail.ru