基于相位平滑伪距的GNSS时差监测评估

随着全球卫星导航系统进一步的发展和完善,在系统层面上对各个GNSS进行实时时差监测是必要的。为了降低时差监测中伪距观测值的观测噪声及多径误差对时差监测的影响,采用相位平滑伪距的方法对伪距观测值的噪声及多径误差进行平滑,该方法可以实时地对伪距观测值进行处理,并且具有较好的平滑效果。利用平滑后的伪距观测值进行时差监测可以将时差监测值的标准差由2~4ns降低到1~3ns,噪声降低比率平均在20%以上。在与BIPM公布的时差数据相比,GPS-GLONASS实测值也具有较好的一致性,可以满足GNSS时差监测与预报的需求。

Monitoring and Evaluation on GNSS System Time Offset with Phase-Smoothed Pseudorange

With the further development and improvement of the global satellite navigation system, it is necessary to monitor the real-time system time offset of each GNSS. To reduce the observation noise and Multipath errors of pseudorange observations during the GNSS system time offset monitoring, this paper uses phase-smoothed pseudorange method to pre-process the pseudorange observations. It is demonstrated that time offset monitoring with pre-processing pseudorange observations can reduce STD of time offset value from 2~4ns to 1~3ns, the ratio of noise reducing averages over 20%, and GPS-GLONASS monitoring value is consistent with the system time offset data published by BIPM. This work will also lead to further research on GNSS system time offset monitoring and forecasting.