In order to achieve the high-stability output of time synchronization device

methods and implementation procedures are proposed with regard to multi-time source selection

timekeeping algorithm and dynamic adjustment. With respect to multi-time source selection

an external independent time source selection strategy based on the clustering algorithm is proposed. An analysis is made on the output quality of associated time source while for the timekeeping algorithm

the adaptive accurate timekeeping algorithm based on remainder dynamic allocation is proposed. And the influences of crystal oscillator parameters on the timekeeping precision are analyzed. In terms of dynamic adjustment

the frequency and phase real-time tracking method based on hardware implementation is proposed. When obvious differences exist between external and local time sources

the frequency and phase of local time source approach the external time source in small steps at a constant speed and tend to be stable. Tests show that good effects can be obtained using the proposed method in achieving timekeeping precision and dynamic adjustment of phase and frequency of high-stability time output.