An investigation of PPP time transfer via BDS-3 PPP-B2b service
An investigation of PPP time transfer via BDS-3 PPP-B2b service
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BDS-3 PPP-B2b服务PPP时间传输研究
DOI：
10.1007/s10291-023-01402-y
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发表时间：
2023-04-01
期刊：
影响因子：
4.9
通讯作者：
Shen, Fei
中科院分区：
文献类型：
--
作者：
Ge, Yulong;Cao, Xinyun;Shen, Fei
自2020年以来，中国的北斗已经开始通过B2b信号为亚太地区提供初始实时精确点定位（PPP）服务。预计将用于实现厘米级定位，并为实时时间传输带来机会。我们收集了29天的实验数据，并将其与法国国家空间研究中心（CNES）的实时产品进行了比较。首先对卫星轨道质量和时钟质量进行了分析。然后，研究了基于BDS-3、GPS和BDS-3/GPS PPP的时间传输。结果表明，GPS PPP不建议采用PPP- b2b模式。基于PPP- b2a的BDS-3 PPP时间传输是可行的，达到了0.30 ns的水平。重要的是，由于互联网通信不稳定的问题，使用PPP- b2b的时间传输可靠性优于使用CNES产品的PPP。此外，与BDS-3相比，基于BDS-3/GPS PPP的时间传输精度没有明显提高。
Since 2020, China's Beidou has begun to provide an initial real-time precise point positioning (PPP) service via B2b signals for the Asia-Pacific region. It is expected to be used to achieve centimeter-level positioning and also brings opportunities for real-time time transfer. We collected 29 days of experimental data and compared it with the Centre National d'Etudes Spatiales (CNES) real-time products. The quality of the satellite's orbit and clock was analyzed first. Then, time transfer based on BDS-3, GPS, and BDS-3/GPS PPP was investigated. The results showed that the GPS PPP with the PPP-B2b is not recommended. The time transfer based on BDS-3 PPP using the PPP-B2a is feasible and achieves a 0.30 ns level. Importantly, the reliability of time transfer using the PPP-B2b outperforms that of PPP using CNES products due to the problem of unstable internet communication. Furthermore, compared to BDS-3-only, the precision of time transfer based on BDS-3/GPS PPP was not improved significantly.