Time transfer performance of BDS-3 satellites improved
Time transfer technology based on navigation satellites started in the 1980s. The conventional common view (CV), all-in-view (AV) and precise point positioning (PPP) time comparison methods based on global navigation satellite system (GNSS) satellites have been widely used in remote and high-precision time comparison activities.
Researchers from the Time Keeping Laboratory, the National Time Service Center (NTSC) of the Chinese Academy of Sciences, analyzed the time transfer performance of BDS-3 signals and found that it was over 50% higher than that of the BDS-2 satellites. The elevation-dependent biases found in BDS-2 code measurements are mitigated in BDS-3.
The results were published in Metrologia on Oct. 28.
They analyzed the pseudorange measurement noise, precision of conventional common view (CV) and all-in-view (AV) time comparison and the instability of the precise point positioning (PPP) time transfer to assess the time transfer performance of BDS-3.
In terms of the common view time comparison, the standard deviations of the zero-baseline common clock time comparison of the new BDS-3 signals are comparable to that of GPS and Galileo.