High precise time-frequency transfer and time synchronization services have become a research focus in GNSS appli-cations. Scholars have conducted numerous studies on time-frequency synchronization models, algorithms and related applica-tions. We propose adifferential precise time transfer model based on carrier phase observations, and establish a BeiDou naviga-tion satellite system real-time 100 picosecond level differential time and frequency synchronization system. With the time trans-fer results of the fiber optic links as reference, differential precise time and frequency synchronization performance is validated. the standard deviation of the BDS real-time pulse per second results is better than 100ps. What's more, the time deviation of the time link within 7 days is better than 70ps. In terms of frequency stability, modified Allan deviation of 104 seconds can reach the level of 10-15, and the long-term frequency stability reaches the level of 10-16. Additionally, the frequency stability of BDS is comparable to that of GPS, which is of valuable significance for further expanding the application of BDS in the time and frequency community.
关键词
BDS/载波相位单差/精密时频传递/实时时间同步
Key words
BDS/carrier phase single difference/precise time and frequency transfer/real-time time synchronization
维普
万方数据