Assessment of the GNSS PPP performance using ultra-rapid and rapid products from different analysis centres

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.