Abstract

Several precise point positioning or relative positioning services are available online for postprocessing static global navigation satellite system (GNSS) data collected on a single mark. The accuracy of five services (OPUS-S, AUSPOS, CSRS-PPP, GAPS, TrimbleRTX) were compared by processing the same 490 static GNSS files of varying session duration (from 2 to 10 h) on six passive marks in minimal or moderate multipathing environments. First, only Global Positioning System (GPS) observables at a 30-s logging rate were tested using each service. Then, the effects of including observables from Russia’s GNSS (i.e., GLONASS) were investigated using TrimbleRTX and CSRS-PPP, and the accuracy of processing data at faster logging rates were evaluated using TrimbleRTX. The results from each service were differenced with coordinates derived from a high-accuracy campaign-style static GNSS survey. Increasing the logging rate from 30 to 10 s did not significantly reduce the root-mean-square error (RMS) of the differences. However, adding GLONASS observables significantly reduced the horizontal RMS by an average of 17.1% and 36.7% at sites in minimal and moderate multipathing environments, respectively.