The performance of precise point positioning (PPP) mainly depends on satellite orbit and clock accuracy. Ultra-rapid and rapid orbit/clock products have been creating by analysis centres (ACs) for time-critical applications. In this paper, GPS-, GLONASS-, Galileo-, and BeiDou (BDS-2)-only PPP with ultra-rapid and rapid products from seven ACs (i.e. CODE, ESA, IGS, GFZ, JPL, NRCan, and WUHAN) are investigated for PPP performance. A two-month period in 2020 was chosen for conducting static and kinematic PPP using data from 32 Multi-GNSS Experiment (MGEX) stations. For GPS-only PPP with different ACs, GFZ/NRCan and CODE/NRCan rank first for ultra-rapid and rapid PPP processes, respectively. For GLONASS-only PPP, positioning performances using ultra-rapid products are comparable with each other except for CODE and ESA products. CODE rapid product ranks last for GLONASS-only PPP. For Galileo and BeiDou-only PPP, GFZ AC performs the best for ultra-rapid processes. For Galileo-only PPP using rapid products, CODE ranks first.

精密单点定位（PPP）的性能主要取决于卫星轨道和时钟精度。分析中心 (AC) 已经为时间关键型应用创建了超快速和快速的轨道/时钟产品。在本文中，仅 GPS、GLONASS、伽利略和北斗 (BDS-2) 的 PPP 具有来自七个 AC（即 CODE、ESA、IGS、GFZ、JPL、NRCan 和 WUHAN）的超快速和快速产品对 PPP 性能进行了调查。选择在 2020 年的两个月期间使用来自 32 个多 GNSS 实验 (MGEX) 站的数据进行静态和动态 PPP。对于具有不同 AC 的仅 GPS PPP，GFZ/NRCan 和 CODE/NRCan 分别在超快速和快速 PPP 流程中排名第一。对于 GLONASS-only PPP，除了 CODE 和 ESA 产品外，使用超快速产品的定位性能是相互可比的。CODE 快速产品在 GLONASS-only PPP 中排名最后。对于 Galileo 和仅限北斗的 PPP，GFZ AC 在超快速流程方面表现最佳。对于仅使用快速产品的 Galileo PPP，CODE 排名第一。