期刊
MEASUREMENT
卷 172, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2020.108871
关键词
Real-time PPP; BDS-3; Precise positioning; Tropospheric delay; Time transfer
资金
- National Natural Science Foundation of China [11703033, 12073034]
- CAS Light of West China Program [XAB2018YDYL01]
- [OFW-19788-WX]
This study conducted a comprehensive investigation of BDS-3 real-time PPP performance, including time transfer, positioning, and tropospheric delay retrieval. The research found that the availability of BDS-3 real-time products was around 80%, and the tropospheric delay estimation is comparable to GPS real-time PPP solutions.
With the development of China's BDS-3, more studies focused on its performance in precise point positioning (PPP), mainly in post-processing mode. This study conducts a comprehensive investigation of BDS-3 real-time PPP with Centre National d'Etudes Spatiales (CNES) real-time products (SSRA00CNE0) from the perspective of time transfer, positioning, and tropospheric delay retrieval. First, the availability and accuracy of BDS-3 real-time products were evaluated over 41 days. The product availability was about 80%. The accuracy of BDS-3 satellite orbit were 0.060, 0.115 and 0.065 m in the radial, along-track, and cross-track component. In addition, the standard deviation (STD) of satellite clock difference was 0.455 ns. Afterwards, precise time transfer, positioning, and Zenith troposphere delay (ZTD) estimation derived from BDS-3 real-time PPP were assessed with 7-day processing. The root mean square (RMS) of smoothed residuals is 0.020 ns, while it is 0.001 ns for BDS-3 PPP with WUM final products for time transfer. Furthermore, the RMS values of positioning errors derived from real-time static BDS-3 PPP positioning were 0.021, 0.010, and 0.03 m in the east (E), north (N), and up (U) component, respectively. Moreover, the RMS of ZTD estimation is 9.9 mm, which is comparable to GPS real-time PPP solutions.
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