Online GPS processing services: an initial study
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There are a number of online Global Positioning System (GPS) processing services that provide GPS processing results to the user free of charge and with unlimited access. These services provide solutions for a user-submitted Receiver Independent Exchange Format (RINEX) file based on differential methods using reference stations or precise point positioning using precise GPS orbit and clock data. Different data sets varying in time and location were submitted to the online services and their results compared. Although the quality of results depends on many factors, in most cases the users can expect reliable online processing results for a 10-h data set made by a geodetic dual frequency receiver anywhere in the world.
Preliminary work on this research was carried out by two undergraduate students at UNB. Their work has been published in Leslie (2004) and Hatch (2003). We thank Duncan Moss and Neil Stuart of the University of Edinburgh, Scotland, for providing the GPS data they collected at Dodola, Ethiopia. Paul Jamason is thanked for providing comments that improved the quality of this paper. We also acknowledge Canada’s ‘Natural Science and Engineering Research Council’ (NSERC) for providing funds to enable this research to be carried out.
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