Design and implementation of time and frequency architecture for BeiDou-3 system
The National Natural Science Foundation of China(42074044)
the Young Elite Scientist Sponsorship Program By CAST (2019QNRC001).
- Received Date: 2021-12-09
- Rev Recd Date: 2022-03-22
- Available Online: 2022-03-25
- time and frequency /
- time synchronization /
- time and frequency traceability /
- time difference monitoring
Abstract: Objecives : As a complex and giant system, the BeiDou navigation satellite system (BDS) demands scientific, complete and efficient design and engineering implementation of time-frequency system. Methods : For the designation of time and frequency architecture for BDS-3, the first step is the realization of establishment, maintenance and synchronization of time and frequency architecture, and then the unification of BeiDou system time(BDT) and other navigation systems. The internal time synchronization for BDS-3 is designed as the methods of time comparison and synchronization among clocks of satellites based on inter satellite link, precise time comparison and synchronization between satellites and ground based on satellite-ground link, and comparison and precise synchronization between master station on ground and its subsystem based on satellite two-way and ground wired twoway time comparison link. The generation of BDT signal is realized by combined clock group and integrated atomic time method. Finally, the unification of BDT and other navigation systems is realized through direct or indirect traceability comparison and time difference monitoring technology. Results : The long-term monitoring results of BDS-3’s signals indicated that the frequency stability per day of BDT reached 4.6×10-15, the local time accuracy of satellite clocks reached 1.25×10-11, the 1000s frequency stability of satellite clocks reached 1.65×10-14, and the time difference between BDS and other navigation satellite system maintained within 50ns.. Conlusions : Within the operation of BDS-3, it is further proved that the time and frequency architecture for BDS-3 is complete in function design, scientific in organizational structure and advanced in system index, which can fully support the global service capability of BDS-3.
|Citation:||Lu Jun, Wu Jianfeng, Yuan Haibo, Shen Jianhua, Meng Yinan, Su Chengeng, Chen Ying. Design and implementation of time and frequency architecture for BeiDou-3 system[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20200529|