XING Yan, HU Yong-hui

(National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China)

Abstract:The design and implementation of a high-performance digital phase-shift system based on DDS(direct digital synthesis) is introduced. For this system, the time synchronization precision is better than 100 ns, the phase-shifting accuracy is 5×10-10 s, and the frequency-modulation precision is 10-6 Hz. This system is designed for time synchronization system, and can also be used in martial system, electric system, communication system, etc.

Key words: phase-shift; time synchronization; direct digital synthesis (DDS)