A.A. Lvov - Dr. Sc. (Eng.), Professor, Yuri Gagarin State Technical University (Saratov). E-mail: alvova@mail.ru M.S. Svetlov - Dr. Sc. (Eng.), Leading Research Scientist, Institute of Precision Mechanics and Control RAS (Saratov). E-mail: svetlovms@yandex.ru Yu.A. Ulyanina - Post-graduate Student, Yuri Gagarin State Technical University (Saratov). E-mail: ulyanina.ya@yandex.ru A.A. Guschina - Ph. D. (Eng.), Senior Police Lieutenant, Voronezh Institute of the Ministry of the Interior of Russia. E-mail: a.gushchina@rambler.ru

N.S. Khokhlov1

1 JSC «Russian Institute of Radionavigation and Time» (Saint Petersburg, Russia)

1 hohlov_ns@rirt.ru