Comparative Analysis of Online Static GNSS Postprocessing Services
Publication: Journal of Surveying Engineering
Volume 144, Issue 4
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.
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Acknowledgments
NOAA funded a portion of this research study by cooperative agreement via the Cooperative Institute for Marine Resources Studies (CIMRS), award NA11OAR4320091. Leica and David Evans & Associates provided most of the survey hardware for the 2014 Oregon survey and some of the software for analysis. Former Oregon State University civil engineering students Michael Eddy, who led the 2014 static survey campaign, and Damon Houck assisted with submitting data files to the online services. Special thanks to Mark Armstrong (National Geodetic Survey, retired) for his advice and assistance, and to Farid Javadnejad, Oregon State University graduate research assistant, for developing and running Skyplotter.
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© 2018 American Society of Civil Engineers.
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Received: Jul 25, 2017
Accepted: Mar 1, 2018
Published online: Jun 21, 2018
Published in print: Nov 1, 2018
Discussion open until: Nov 21, 2018
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