V.S. Efimenko - Dr. Sc. (Eng.), Professor, Head Department, OJSC «VNIIR-Progress» (Moscow). E-mail: vefimenko@abselectro.com V.N. Kharisov - Dr. Sc. (Eng.), Professor, Director of Navigation and Communication Systems, OJSC «VNIIR-Progress» (Moscow). E-mail: vhar@list.ru D.N. Voronchikhin - Junior Research Scientist, OJSC «VNIIR-Progress» (Moscow). E-mail: dvorinchikhin@abselectro.com