A.I. Gordienko - Academician of Sciences, Director of Research Center, Physical-Technical Institute of National Academy of Sciences of Belarus Y.F. Yatsyna - Ph.D. (Eng.), Director of Scientific and Production Center, Physical-Technical Institute of National Academy of Sciences of Belarus M.V. Maksimova - Specialist, Physical-Technical Institute of National Academy of Sciences of Belarus. E-mail: maks.uav@gmail.com