The Canadian Geodetic updates CSRS-PPP service

The Canadian Geodetic Survey (CGS) of Natural Resources Canada (NRCan) updated the Canadian Spatial Reference System Precise Point Positioning (CSRS-PPP) service on 14 May 2025. This CSRS-PPP update includes, for the first time, support for Galileo PPP with ambiguity resolution (Galileo PPP-AR) for E1/E5a observations collected beginning 27 November 2022 when processed with either the Rapid or Final products. Submissions processed with the Ultra-rapid products will continue to support only GPS and GLONASS observations.

The main advantage of including dual-frequency Galileo observations in CSRS-PPP submissions is that they allow users to achieve improved accuracies, especially for shorter datasets, compared with only GPS and GLONASS submissions. This means that users can collect less data to meet their accuracy needs, mainly because, similarly to GPS, CSRS-PPP attempts to fix the integer ambiguities for Galileo when possible. More details on the CSRS-PPP ambiguity resolution algorithm can be found in the CSRS-PPP version 3 PPP‑AR tutorial. The addition of Galileo will also improve the satellite geometry, especially when tracking in less-than-ideal conditions. Figures 1 to 3 compare the achievable accuracies between CSRS-PPP v4 with GPS and GLONASS, and CSRS-PPP v5 with GPS, GLONASS, and Galileo, when processing geodetic-quality GNSS observation sets between 15 minutes and 12 hours. The CSRS-PPP v5 accuracy improvement can reach up to 40-60% for datasets of up to one hour and approximately 10-20% for 12 hours.

https://webapp.csrs-scrs.nrcan-rncan.gc.ca