Method and structure for determining global clock among systems

Abstract

A method and a structure for determining a global clock among systems are disclosed. When a standardized time reference is required among systems, a reference clock source may transmit a calibration signal, and a transmitting time T(0) may be recorded. Each system may respectively record an arrival time T(n), transmit a return signal to a signal recording unit of the reference clock source, and record a transmitting time T(n), after receiving the calibration signal. Similarly, because of different distances, the signal recording unit may record arrival times T(n) of the return signals subsequently, and determine time delays Delay (n) between systems and the reference clock source respectively. When all the systems are required to have a completely standardized time reference, a corresponding Delay (n) may be acquired and transmitted to each system. Each system may determine zero deviations T(n) of various local clocks from the reference clock source, and take T(n) as a correction parameter to correct its own system clock, so that the local clocks of all the systems have a completely standardized time reference.