Real-time precise orbit/clock product is fundamental to BeiDou Navigation Satellite System (BDS) real-time precise point positioning (PPP). In order to explore achievable performance of BDS real-time orbit/clock products and thus offer usage recommendations for BDS real-time PPP users, this paper studies BDS real-time orbit/clock corrections provided by four International GNSS Service (IGS) Analysis Centers (ACs), i.e. Wuhan University (WHU), Deutsches Zentrum für Luft- und Raumfahrt (DLR), GeoForschungsZentrum Potsdam (GFZ) and Centre National d’ Etudes Spatiales (CNE) for seven consecutive days staring from day of year (DOY) 324, 2019. Firstly, the availability of BDS-2 real-time orbit/clock corrections is studied. Larger than 85% availabilities are identified for all ACs. During the test period, DLR does not provide all Geosynchronous Earth Orbit (GEO) satellites’ corrections, whereas CNE does not provide C14/C16′s corrections. Secondly, the BDS real-time orbit accuracy is analyzed. Results indicate that the real-time orbit accuracy of GEO satellites is at meter level, and those of Inclined Geosynchronous Satellite Orbit (IGSO)/Medium Earth Orbit (MEO) satellites are at decimeter level. Among all ACs, the accuracy of CNE’s three-dimensional (3D) orbit correction is the best, which is 2.391/0.278/0.271 m for GEO/IGSO/MEO satellites, respectively. DLR has the largest orbit errors of 1.116/0.504 m for IGSO/MEO satellites. Thirdly, the BDS real-time clock offset precision is investigated. On the one hand, CNE’s real-time corrections still perform best with 1.19/0.28/0.32 ns clock offset precision for GEO/IGSO/MEO satellites, respectively. On the other hand, DLR’s real-time clock is the worst with 2.61/1.91 ns IGSO/MEO clock offset precision. Finally, all corrections are applied to estimate 47 Multi-GNSS Experiment (MGEX) station’s BDS-2 real-time PPP on DOY 330, 2019. Results show an average of 0.53–1.46 h convergence time and 8.8–10.9 cm positioning accuracy in the static mode. In the meantime, the average convergence time in the kinematic mode is 2.11–9.84 h, much longer than the static counterpart. The corresponding converged positioning accuracy is 30.7–68.0 cm. To sum up, WHU/GFZ/CNE’s real-time corrections are proven with satisfied orbit/clock performance, thus are recommended for BDS-2 real-time PPP.

实时精确的轨道/时钟产品是北斗导航卫星系统（BDS）实时精确点定位（PPP）的基础。为了探索BDS实时轨道/时钟产品的可实现性能，从而为BDS实时PPP用户提供使用建议，本文研究了四个国际GNSS服务（IGS）分析中心提供的BDS实时轨道/时钟校正。 （ACs），例如武汉大学（WHU），德国国防军和德国空军（DLR），GeoForschungsZentrum波茨坦（GFZ）和国家立志演习空间中心（CNE），连续7天从每年的日期开始（DOY）324 ，2019年。首先，研究了BDS-2实时轨道/时钟校正的可用性。确定所有AC的可用性均大于85％。在测试期间 DLR并不提供所有的地球同步轨道（GEO）卫星校正，而CNE则不提供C14 / C16校正。其次，分析了BDS的实时轨道精度。结果表明，GEO卫星的实时轨道精度在米级，而倾斜地球同步卫星轨道（IGSO）/中地轨道（MEO）卫星的实时精度在米级。在所有AC中，CNE的三维（3D）轨道校正精度最高，对于GEO / IGSO / MEO卫星分别为2.391 / 0.278 / 0.271 m。对于IGSO / MEO卫星，DLR的最大轨道误差为1.116 / 0.504 m。第三，研究了BDS实时时钟偏移精度。一方面，对于GEO / IGSO / MEO卫星，CNE的实时校正仍以1.19 / 0.28 / 0.32 ns的时钟偏移精度保持最佳状态。另一方面，DLR的实时时钟是最差的，其IGSO / MEO时钟偏移精度为2.61 / 1.91 ns。最后，所有的校正都将应用于估计DOY 330上的47个Multi-GNSS实验（MGEX）站的BDS-2实时PPP，2019年的结果。结果表明，平均收敛时间为0.53–1.46 h，定位精度为8.8–10.9 cm。静态模式。同时，运动学模式下的平均收敛时间为2.11–9.84 h，比静态对应时间长得多。相应的聚合定位精度为30.7–68.0 cm。总而言之，WHU / GFZ / CNE的实时校正已被证明具有令人满意的轨道/时钟性能，因此推荐用于BDS-2实时PPP。所有的校正都将应用于估计DOY 330上的47个多GNSS实验（MGEX）站的BDS-2实时PPP实时PPP，结果显示静态模式下的平均收敛时间为0.53–1.46 h，定位精度为8.8–10.9 cm 。同时，运动学模式下的平均收敛时间为2.11–9.84 h，比静态对应时间长得多。相应的聚合定位精度为30.7–68.0 cm。总而言之，WHU / GFZ / CNE的实时校正已被证明具有令人满意的轨道/时钟性能，因此推荐用于BDS-2实时PPP。所有的校正都将应用于估计DOY 330上的47个多GNSS实验（MGEX）站的BDS-2实时PPP实时PPP，结果显示静态模式下的平均收敛时间为0.53–1.46 h，定位精度为8.8–10.9 cm 。同时，运动学模式下的平均收敛时间为2.11–9.84 h，比静态对应时间长得多。相应的聚合定位精度为30.7–68.0 cm。总而言之，WHU / GFZ / CNE的实时校正已被证明具有令人满意的轨道/时钟性能，因此推荐用于BDS-2实时PPP。相应的聚合定位精度为30.7–68.0 cm。总而言之，WHU / GFZ / CNE的实时校正已被证明具有令人满意的轨道/时钟性能，因此推荐用于BDS-2实时PPP。相应的聚合定位精度为30.7–68.0 cm。总而言之，WHU / GFZ / CNE的实时校正已被证明具有令人满意的轨道/时钟性能，因此推荐用于BDS-2实时PPP。