Application of EMD in motive time-frequency system

Abstract

The motive time-frequency system is necessary backup and supplement of the fixed ground time-frequency system. It takes on main tasks of providing high precision time and frequency signals replacing the fixed ground time and frequency system in wartime or under special cases so as to meet all kinds of users' demands. However, compared with the fixed ground time-frequency system, the work environment is adverse, and the number of atomic clock is very small on motive conditions. So it is the existing time keeping method that is not fully applicable to monitor and steer the motive time-frequency system time. In this paper, the time keeping modes of the motive time-frequency system are studied firstly. The empirical mode decomposition method is used to detect singularities of atomic clock signal, and forecast the main clock frequency secondly. In addition, the methods which monitor and steer the system time for different working modes on the motive conditions are put forward by studying the steering strategies of the main clock.