Stability study of GPS synchronous clock in the status monitoring system of power network

The second pulse signal output from GPS receiver is highly synchronous with the universal coordinated time, and it has a high accuracy. But since its error is ranged in normal distribution, the error of a single second pulse signal may be large. To improve the accuracy and stability of the synchronous timer in GPS, this paper presents a new method to implement highly accurate and stable clock by the synchronization of crystal oscillator clock with GPS clock, which is based on the complement of the errors between GPS and crystal oscillator. The designed synchronous timer is not affected by the possible transient invalidation of GPS. It has a high reliability and can satisfy the requirements of the status monitoring system in power network.