Evaluation of precise point positioning services

O'Sullivan, Daniel (2014) Evaluation of precise point positioning services. [USQ Project]


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Precise Point Positioning (PPP) is a Global Navigation Satellite System (GNSS) positioning method which enables the calculation of a precise position utilising a single
geodetic quality GNSS receiver and PPP software. There has been a range of research which has examined the accuracy and reliability of freely available online PPP services.
This study will look to confirm the results of previous findings and follow up on some gaps identified in existing research.

This study compared the performance of AUSPOS, OPUS, CSRS-PPP and Magic PPP. It initially compared them to existing Survey Control Information Management System (SCIMS) coordinated survey marks but discovered the SCIMS coordinates were not suitable for comparison. It examined solutions for bias as well as comparing the
differential baseline processing method to true PPP method. It examined the effect of including GLONASS satellite observation data with GPS satellite observation data in
order to develop a solution and it compared the results to previous studies in order to test the reliability of research to date.

The results of this study confirmed the results of previous research and found that that all solutions were similar (ASPOS, OPUS and CSRS-PPP solutions are all in the order
of ten millimetres apart). It confirmed that twenty-four-hour observations are the minimum required in order to derive a reliable height coordinate and that observations
exceeding six hours provide minimal improvements in horizontal position. It identified a distinct bias of results between solutions and identified that reference station network and location may be a significant cause. The differential baseline processing method was more precise than true PPP and the GNSS derived solution whilst not significantly more or less accurate than the GPS solution, was more precise and the outliers were
closer to the average solution.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Spatial Science (Surveying) project.
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Gibbings, Peter
Date Deposited: 09 Sep 2015 05:09
Last Modified: 04 Mar 2016 05:30
Uncontrolled Keywords: precise-point-positioning, post-processing, GNSS
Fields of Research (2008): 09 Engineering > 0909 Geomatic Engineering > 090904 Navigation and Position Fixing
Fields of Research (2020): 40 ENGINEERING > 4013 Geomatic engineering > 401303 Navigation and position fixing
URI: https://sear.unisq.edu.au/id/eprint/27255

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