电子学报 ›› 2022, Vol. 50 ›› Issue (4): 832-840.DOI: 10.12263/DZXB.20211177

所属专题: 智能时空信息服务技术

• 智能时空信息服务技术 • 上一篇    下一篇

一种基于北斗三号B2b信号的精密单点授时方法

易卿武1,2,3, 蔚保国2,3, 王彬彬2,3, 盛传贞2,3   

  1. 1.西安电子科技大学电子工程学院,陕西 西安 710071
    2.卫星导航系统与装备技术国家重点实验室,河北 石家庄 050081
    3.中国电子科技集团公司第五十四研究所,河北 石家庄 050081
  • 收稿日期:2021-08-30 修回日期:2022-02-18 出版日期:2022-04-25 发布日期:2022-04-25
  • 作者简介:易卿武 男,1975年2月出生,湖南石门人.研究员,2001年于中国空间技术研究院获得硕士学位,现任卫星导航系统与装备技术国家重点实验室副主任,并于西安电子科技大学攻读博士学位.主要研究方向为GNSS时频同步与监测评估. E-mail: 13933827718@139.com
    蔚保国 男,1966年10月出生,内蒙古凉城人.研究员,工学博士.现任中国电科集团首席科学家、中国电科54所副总工程师、卫星导航系统与装备技术国家重点实验室主任.主要研究方向为卫星导航系统体制、地面运控、终端芯片、测试评估以及位置服务系统.
  • 基金资助:
    国家重点研发计划(2019YFC1511504);中国电科发展基金(BAX20684X010);中电54所专项基金(SCX20684X012)

A Precise Point Timing Method Based on BDS-3 B2b Signal

YI Qing-wu1,2,3, YU Bao-guo2,3, WANG Bin-bin2,3, SHENG Chuan-zhen2,3   

  1. 1.School of Electronic Engineering,Xidian University,Xi’an,Shaanxi 710071,China
    2.State Key Laboratory of Satellite Navigation System and Equipment Technology,Shijiazhuang,Hebei 050081,China
    3.The 54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang,Hebei 050081,China
  • Received:2021-08-30 Revised:2022-02-18 Online:2022-04-25 Published:2022-04-25

摘要:

授时是卫星导航系统的基本服务之一,在先进电子设备研制和智能时空信息服务中具有重要作用.针对当前全球卫星导航系统(Global Navigation Satellite System,GNSS)授时方法存在的受地面共视观测站和通信网络限制的问题,本文提出一种基于北斗三号B2b信号的精密单点授时方法(B2b signal based Precise Point Timing,B2b-PPT).该方法利用北斗三号地球静止轨道(Geostationary Earth Orbit,GEO)卫星播发的B2b信号,结合双频伪距和载波相位观测值,根据精密单点定位算法实时估算接收机钟差.经过世界协调时(Universal Time Coordinated,UTC)偏差改正和硬件延迟校准后,B2b-PPT接收机对本地时钟进行驯服,从而实现高精度时频同步.基于iGMAS(international GNSS Monitoring and Assessment System)观测站的实验结果表明:使用B2b-PPT方法的单站授时精度为0.58 ns,10 h的频率稳定度为6.9E-15;站间模式的授时精度为0.33 ns,10 h的频率稳定度为1.1E-14.与传统的精密单点授时方法相比,B2b-PPT方法授时精度更高,并且具有成本低、不依赖地面通信网络和分析中心的优势.

长摘要
授时是全球卫星导航系统的基本服务之一,同时也在先进电子设备研制和智能时空信息服务中发挥着关键作用。随着北斗卫星导航系统的全面建成与正式运营,基于BDS(BeiDou Navigation Satellite System)的精密授时技术将会成为国民经济发展和国防安全保障的重要研究与发展方向。传统的GNSS(Global Navigation Satellite System)授时方法包括标准单站法、共视法和事后或者实时PPP(Precise Point Positioning)法,存在授时精度低、服务范围有限、受地面共视观测站和通信网络限制等问题。针对上述技术难题,本文提出一种基于北斗三号B2b信号的精密单点授时方法B2b-PPT(B2b signal based Precise Point Timing),该方法利用北斗三号GEO(Geostationary Earth Orbit)卫星播发的B2b信号,通过SSR(State Space Representation)和广播星历恢复实时精密星历,结合接收机双频伪距和载波相位观测值,根据精密单点定位算法实时估算接收机钟差。B2b-PPT接收机经过UTC(Universal Time Coordinated)偏差改正和硬件延迟校准后,对本地时钟进行驯服,从而实现高精度的授时和频率同步。基于多个iGMAS(international GNSS Monitoring and Assessment System)观测站的实验结果表明:使用B2b-PPT方法的单站授时精度为0.58ns,10小时的频率稳定度为6.9E-15;站间模式的授时精度为0.33ns,10小时的频率稳定度为1.1E-14。与传统的精密单点授时方法相比,B2b-PPT方法授时精度更高,并且具有成本低、不依赖地面通信网络和分析中心的优势。

关键词: 北斗三号, B2b信号, 精密单点授时, 授时精度, 频率稳定度

Abstract:

Timing is one of the basic services of GNSS(Global Navigation Satellite System) and plays an important role in advanced electronic equipment developing and intelligent spatiotemporal information service. Current GNSS timing methods are limited to common-view station and communication network. To deal with these problems, we propose a precise point timing method based on BDS-3(BeiDou Navigation Satellite System) B2b signal, called B2b-PPT(B2b signal based Precise Point Timing), which using dual frequency observations and estimating receiver clock by precise point positioning algorithm. After UTC(Universal Time Coordinated) bias correction and hardware delay calibration, the B2b-PPT receiver disciplines the clock to realize precise time-frequency synchronization. Experimental results based on iGMAS(international GNSS Monitoring and Assessment System) stations show that the accuracy of timing using B2b-PPT method is 0.58 ns and the frequency stability at 10 hours is 6.9E-15 in single station mode, corresponding indicators are 0.33 ns and 1.1E-14 respectively in station difference mode. In conclusion, the performance of B2b-PPT method is better than traditional GNSS precise point timing method, and the B2b-PPT method also has the advantage of low cost and being independent of ground communication network and analysis center.

Extended Abstract
Timing is one of the basic services of GNSS(Global Navigation Satellite System) and is crucial to advanced electronic equipment developing and intelligent spatiotemporal information service. With the full completion and formal operation of BDS(BeiDou Navigation Satellite System), the precision timing service technology based on BDS will become an important research and development direction for national economic development and national defense security. Current GNSS timing methods, including single station timing method, common view method, post and real-time PPP(Precise Point Positioning) method, facing problems such as low timing accuracy, limited servicing scope, restricted by ground common view observation station and communication network. To deal with these above problems, this paper propose a precise point timing method based on BDS-3 B2b signal, called B2b-PPT(B2b signal based Precise Point Timing), which fusing SSR(State Space Representation) and broadcast ephemeris to recovery real-time precise ephemeris, and using dual frequency pseudo-range and carrier phase observations to estimate receiver clock by precise point positioning algorithm. After correcting UTC(Universal Time Coordinated) bias and calibrating hardware delay, the B2b-PPT receiver disciplines the receiver clock to realize precise time-frequency synchronization. Experimental results based on serval iGMAS(international GNSS Monitoring and Assessment System) stations show that the accuracy of timing using B2b-PPT method is up to 0.58 ns and the frequency stability at time interval of 10 hours is 6.9E-15 in single station mode. While in station difference mode, the timing accuracy is 0.33 ns and the frequency stability at time interval of 10 hours is 1.1E-14. In conclusion, the performance of B2b-PPT method is better than traditional GNSS precise point timing method, and the B2b-PPT method also has the advantage of low cost and being independent of ground communication network and analysis center.

Key words: BDS-3, B2b signal, precise point timing, timing accuracy, frequency stability

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