Atiz, Omer FarukShakor, Abbas QaderOgutcu, SermetAlcay, Salih2024-02-232024-02-2320230039-62651752-2706https://doi.org/10.1080/00396265.2021.1999128https://hdl.handle.net/20.500.12452/12985In the middle of 2011, Trimble introduced the RTX correction service to support RT-PPP applications. In this study, the performance of Trimble RTX correction service is investigated over a one-month period using five different GNSS constellations - namely, GPS-only, GPS + GLONASS, GPS + Galileo, GPS + GLONASS + Galileo, and GPS + GLONASS + Galileo + BeiDou. The results show that positioning accuracy and convergence time are significantly improved with the use of the multi-GNSS constellation compared with the GPS-only solution. The result of the converged positioning accuracy indicates that the GPS + GLONASS + Galileo + BeiDou combination improves the accuracy by 63%, 54%, and 60% for north, east, and up components, respectively, compared with the GPS-only solution. The mean convergence time is reduced by the GPS + GLONASS+ Galileo + BeiDou combination by 70%, 71%, and 38.6% compared with the GPS-only solution in the north, east, and up components, respectively. 1.2 (north), 1.5 (east), and 2.3 cm (up) root mean square errors (RMSEs) of converged positioning from the GPS + GLONASS + Galileo + BeiDou combination are computed.eninfo:eu-repo/semantics/closedAccessBeidouGpsGlonassGalileoPppTrimble RtxArticle5538844542-s2.0-85119285008Q2WOS:000717867900001Q410.1080/00396265.2021.1999128