Time transfer using GPS/GLONASS code phase

The Soviet Union´s global navigation satellite system, GLONASS, currently has 13 pre-operational satellites. The corresponding number of available Navstar GPS satellites is 19. Since only a single satellite is required for time transfer to a known location, the potential of both GPS and GLONASS as disseminators of time and frequency is considerable. GLONASS provides worldwide time dissemination and time transfer services in the same manner as the Navstar GPS and exhibits the same advantages as Navstar does over other existing timing services. Time transfer is both efficient and economic in the sense that direct clock comparisons can be achieved via GLONASS between widely separated sites without the use of portable clocks. Event time tagging can be achieved with the minimum of effort and users can reacquire GLONASS time at any instant due to the continuous nature of time aboard the satellites