V.Yu. Kiselev - Master, Post-graduate Student, Department of Airborne Radio Equipment, Saint-Petersburg State University of Aerospace Instrumentation. E-mail: vukis@bk.ru A.A. Monakov - Dr. Sc. (Eng.), Professor, Department of Airborne Radio Equipment, Saint-Petersburg State University of Aerospace Instrumentation. E-mail: a_monakov@mail.ru