S.V. Eskin - Engineer, Saratov branch of the Kotel-nikov Institute of Radio Engineering, and Electronics Russian Academy of Sciences. E-mail: vn.stanislav@gmail.com
N.M. Ushakov - Dr. Sc. (Phys.-Math.), Professor, Head of the Laboratory, Saratov branch of the Kotel-nikov Institute of Radio Engineering, and Electronics Russian Academy of Sciences

S.V. Eskin - Engineer, Saratov branch of the Kotel-nikov Institute of Radio Engineering, and Electronics Russian Academy of Sciences. E-mail: vn.stanislav@gmail.com
N.M. Ushakov - Dr. Sc. (Phys.-Math.), Professor, Head of the Laboratory, Saratov branch of the Kotel-nikov Institute of Radio Engineering, and Electronics Russian Academy of Sciences

S.V. Eskin - Engineer, Saratov branch of the Kotel-nikov Institute of Radio Engineering, and Electronics Russian Academy of Sciences. E-mail: vn.stanislav@gmail.com N.M. Ushakov - Dr. Sc. (Phys.-Math.), Professor, Head of the Laboratory, Saratov branch of the Kotel-nikov Institute of Radio Engineering, and Electronics Russian Academy of Sciences