S.V. Ermak1, V.V. Semenov2, O.V. Ermak3

1,2 Higher school of applied physics and space technologies, Institute of Electronics and Telecommunications, Peter The Great St. Petersburg Polytechnic University (Saint-Petersburg, Russia)

3 Higher School of Hydraulic and Power Engineering, Institute of Civil Engineering, Peter The Great St. Petersburg Polytechnic University (Saint-Petersburg, Russia)