基于GNSS邻域相似性的5G基站纳秒级时间同步技术研究

doi:10.11959/j.issn.1000-436x.2020024

Abstract

Abstract:

For precision positioning requirements in the LTE-A/5G service developed by the 3GPP,the nanosecond precision time synchronization technology based on global navigation satellite system (GNSS) for 5G base station was studied which broke through the current GNSS receiver’s hundred nanosecond timing accuracy.By analyzing the characteristics of neighborhood similarity of GNSS errors and combining the characteristics of time synchronization requirements of 5G base stations,a nanosecond precision time synchronization theory and related receiver algorithms for 5G base stations was proposed which based on the principle of neighborhood similarity of GNSS signals.The specific characteristics of the time synchronization technology under regional and wide-area conditions were studied.The simulation and experimental results show that compared with the current time synchronization accuracy within hundred nanosecond rang of base stations,the proposed method can achieve precision time synchronization within 3 ns between the regional base stations,and support 5G base station meter-level precision location based service(LBS) and other advanced incremental services.

Key words: 5G, location based service, global navigation satellite system, nanosecond level, precision time synchronization

CLC Number:

TN915.1

Wenxue LIU,Shijun CHEN,Jian GE,Hong YUAN,Cuiling GONG. Research on nanosecond time synchronization technology for 5G base station based on GNSS neighborhood similarity[J]. Journal on Communications, 2020, 41(1): 180-190.

Figures/Tables 17

References 29

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误差项	对区域时间同步的影响	误差项的表现特性
接收机钟漂	10~50 ns	接收机各不相同，可通过解算消除
接收机噪声	<1 ns	对每个用户是相互独立的，与接收机的环路设计和硬件设计相关
星钟误差	0	单颗卫星对于不同用户来说是相同的
星历误差	\|R\| <0.08 ns，R代表广播星历残差在卫星与接收机连线方向上的投影	误差稳定，每颗卫星独立，与卫星仰角相关
对流层误差	0~0.7 ns^①	与卫星仰角相关
电离层误差	0~0.7 ns	与卫星仰角和电离层情况相关

项目	均方根差/m	均值/m
星钟误差	0.7	2
星历误差	0.3	0
电离层误差	0.5	4
对流层误差	0.5	0.5
接收机噪声	0.5	0.2

方法	最大值/ns	最小值/ns	均方误差/ns
本文方法	1.12	-1.01	0.31
传统PVT解算方法	5.45	-2.41	1.65

Research on nanosecond time synchronization technology for 5G base station based on GNSS neighborhood similarity

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