Evaluation of the performance of web-based GNSS post processing systems

Cleaver, Benjamin L. (2013) Evaluation of the performance of web-based GNSS post processing systems. [USQ Project]

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Abstract

The use of existing survey control infrastructure is paramount to the work carried out by surveyors
when undertaking many projects. Due to the limited availability of existing survey control infrastructure throughout regional Australia; surveyors require a means to obtain coordinates in the relevant national datum. The method routinely used by surveyors in Australia involves
recording GNSS observations and submitting these observations to a free online service GNSS postprocessing
service run by Geoscience Australia- AUSPOS.

The accuracy of AUSPOS has been investigated through a limited number of research papers. This project investigates the performance of AUSPOS and other on-line GNSS post-processing services that are available internationally: CSRS-PPP, SCOUT, AUTO GIPSY and OPUS. The performance of the services is investigated in two different respects. Firstly a comparison of the on-line postprocessing services by analysis of the results obtained from each service from identical input data. Secondly, the post processing services are also evaluated in terms of the positional accuracy expected when using any of the on-line GPS services, in relation to existing survey control
infrastructure.

It was found that the differences between the services AUSPOS, SCOUT and CSRS-PPP are negligible when compared to the residual difference to a known survey control mark. Trends in the consistency of the processed coordinates showed that baseline processing services were marginally
more accurate than the PPP processing services, although the inconsistent results of GIPSY may have contributed to this trend. It was found that the accuracy of the processed solutions of each of the services did not significantly improve with observations longer than 4 hours. The accuracy of coordinates in relation to existing control marks is found to be in the order of 2-3cm in the horizontal component and 100-150mm in the vertical component.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Spatial Science (Surveying) project.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Zhang,Zhenyu
Date Deposited: 10 Feb 2014 01:18
Last Modified: 19 Jul 2018 00:20
Uncontrolled Keywords: evaluation; web-based gnss; post processing systems
Fields of Research : 09 Engineering > 0909 Geomatic Engineering > 090906 Surveying (incl. Hydrographic Surveying)
URI: http://eprints.usq.edu.au/id/eprint/24710

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