O.V. Cvetkov Dr.Sc. (Eng.), Professor, Department of Biotechnical Systems, Saint Petersburg Electrotechnical University «LETI» E-mail: ovts@bk.ru Y.A. Zhivolupova Post-graduate Student, Department of Biotechnical Systems, Saint Petersburg Electrotechnical University «LETI» E-mail: iulia.zhivolupova@gmail.com V.V. Savchenko Senior Research Scientist, Department of Biotechnical Systems, Saint Petersburg Electrotechnical University «LETI» E-mail: savchenko@mail.ru