关键词: 精密单点定位, 共视比对, 实时动态

Abstract: The traceability comparison device has the function of remote time traceability which is based on satellite navigation system. The device that deployed in two places can trace back to the master laboratory to carry out the clock common view comparison, which helps the construction of the time-frequency traceability comparison system, which realizes high-precision time synchronization between two places. When the traceability comparison device receives satellites’ signals to calculate pseudo range, it is affected by ionospheric delay and other factors, which is not conductive to the positioning. To improve the capacity of traceability comparison and decrease the uncertainty of common view comparison, it is essential to explore the correlation between timing stability of single station and positioning accuracy. According to the calculation of the common view files of the Beijing Institute of Radio Metrology and Measurement (BIRMM) for three consecutive months, it can be obtained that the timing of a single station is stable in the range of 0.6~1.6 ns.Precision point positioning algorithm is used to calculate the navigation files and the precision ephemeris, and the positioning accuracy of East-North-Up directions can be obtained. The positioning accuracy is consistent with the fluctuation trend of the timing stability curve of single station. Linear regression analysis was used to explain 5.7% of the change in timing stability of single station, indicating a weak correlation between the two sites, which means improving the positioning accuracy of a single point has a positive impact on reducing the uncertainty of the common view.

Key words: Precise Point Positioning(PPP), Common View(CV), Real-time Kinematic