基于粒子滤波的5G-R时间同步补偿方法

Particle Filter⁃based Time Synchronization Compensation Method for 5G⁃R

5G-R作为下一代高速铁路时间同步无线通信系统,保持时间同步对高速铁路行车安全至关重要。针对现有时间同步方法未考虑5G-R快速时变信道的影响,导致主从时钟偏移估计不准确的问题,提出一种基于粒子滤波的5G-R时间同步补偿方法。构建5G-R主从时钟的相位及频率偏移的状态转移方程;采用粒子滤波算法得到时钟偏移最优估计值;完成对5G-R时间同步误差的补偿;通过试验仿真,实现多普勒频移对5G-R时间同步的影响分析,得到对高速铁路不同典型场景下时间同步性能的定量分析。结果表明:提出的方法能够有效降低5G-R无线信道时钟偏差,较其他方法具有更好的稳定性和同步性能。

Maintaining time synchronization of 5G-R,as the next generation high-speed railway time synchronization wireless communication system,is crucial for the safety of high-speed railway operation.Addressing the issue of inaccu-rate estimation of master-slave clock skew caused by the failure of the existing time synchronization methods to consider the influence of 5G-R fast time-varying channel,this paper proposed a particle filter-based method to compensate for 5G-R time synchronization.Firstly,a state transition equation was constructed for the phase and frequency shift of the mas-ter-slave clock.Secondly,the particle filter algorithm was used to obtain the optimal estimation of 5G-R clock skew.Fi-nally,the proposed method was used to compensate for the 5G-R time synchronization error.Through experimental simu-lation,the influence of doppler frequency shift on 5G-R time synchronization was analyzed and the quantiative analysis of time synchronization performance in different typical scenarios of high-speed railway was obtained.The experimental re-sults show that this method can effectively reduce the 5G-R wireless channel clock skew,with better stability and syn-chronization performance compared with other methods.