Design and implementation of time and frequency architecture for BeiDou-3 system
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摘要: 北斗卫星导航系统作为复杂巨系统，需要科学完整高效的时频体系总体设计与工程实现。北斗三号系统的时频体系设计，首先通过基于星间链路实现星载钟之间的比对与时间同步，基于星地时间比对链路实现主控站与卫星间的星地时间比对与精密同步，基于卫星双向、地面有线双向时间比对链路实现主控站各分系统之间的比对与精密同步等方法实现北斗系统内部的时间同步，同时基于组合钟组和综合原子时等方法生成北斗系统时间（BeiDou system time，BDT），从而实现北斗系统内的时间建立、保持与同步。然后，通过直接或间接的溯源比对，以及时差监测，实现BDT与其它导航系统时间基准的统一。北斗三号卫星信号的长期监测数据表明，BDT天稳定度达到4.6×10-15，星载钟本地时间准确度达到1.25×10-11，星载钟万秒稳定度达到1.65×10-14，同时BDT相对于其他卫星导航系统的时差保持在50ns以内。经系统运行检验与监测评估，证明北斗三号系统时频体系功能完备、组织架构科学、体系指标先进，能够全面支撑北斗三号的全球服务能力。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.
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[1] Hang Y, Wang H, Zhang S. Remote time and frequency transfer experiment based on BeiDou Common View[C]//European Frequency and Time Forum (EFTF), 2016. [2] Liang K, Zhang A, Pei C, Zuo F. Preliminary Implementation of Time and Frequency Transfer by BDS[C]. Joint UFFC, EFTF and PFM Symposium, 2013. [3] Li W, Zhang J, Guang W,et al. The performance evaluation of the BD one-way time service[C]. Joint Conference of the IEEE International Frequency Control Symposium & the European Frequency and Time Forum, 2015. [4] Yuan H,Guang W, Yang F. Time service through BD GEO satellites[C]. Joint European Frequency and Time Forum & International Frequency Control Symposium (EFTF/IFC), 2013. [5] 郭树人,蔡洪亮,孟轶男, 等.北斗三号导航定位技术体制与服务性能[J].测绘学 报,2019,48(7):810-821) Guo S, Cai H, Meng Y, et al. BDS-3 RNSS technical characteristics and service performance (in Chinese). Acta Geodaetica Et Cartographica Sinica,2019,48(7):810-821 -
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