Comparative Analysis of Standard Time Reproducibility Performance for Very Long Baseline

In this paper, the standard time reproduction equipment deployed by the National Time Service Center of the Chinese Academy of Sciences in Minsk, Belarus, was used as the reference, and the performance of the two different methods, satellite common-view and satellite all-view, was verified. Under the condition of a ultra-long baseline of 6,240 kilometers, the limitation of fewer satellites with longer baselines was broken, and the comparison method was improved to enhance the precision of common-view comparison method. The analysis results show that, under the same test environment and using visible satellites of both GPS and BDS systems, the standard time reproduction effect using satellite common-view is better than that using satellite all-view method, whether in the absolute deviation between the reproduced signal and the standard time signal or in the statistical standard deviation of the measurement results. The satellite common-view method used in this paper is superior to the satellite all-view method in terms of both absolute deviation and statistical standard deviation, which can provide reference for the next step of global super-long baseline standard time reproduction.