Geomatics and Environmental Engineering, vol. 15, no. 4

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Vol. 15 No. 4 (2021): Geomatics and Environmental Engineering

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Submitted
Dec 17, 2020
Accepted
Jun 14, 2021
Published
Sep 17, 2021
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This work is licensed under a Creative Commons Attribution 4.0 International License.

Accuracy Assessment of a Variety of GPS Data Processing, Online Services and Software

https://doi.org/10.7494/geom.2021.15.4.5
Israa H. Mohammed
Civil Engineering Department, University of Technology – Iraq
https://orcid.org/0000-0002-8904-0097
Tariq N. Ataiwe
Civil Engineering Department, University of Technology – Iraq
https://orcid.org/0000-0002-5838-3687
Hisham Al Sharaa
Civil Engineering Department, University of Technology – Iraq
https://orcid.org/0000-0002-1026-8866

Corresponding Author(s) : Israa H. Mohammed

40278@uotechnology.edu.iq

Geomatics and Environmental Engineering, Vol. 15 No. 4 (2021): Geomatics and Environmental Engineering

Abstract

The processing of GPS observations in precise positioning is complex and requires professional surveyors since it must be carried out after each static measurement. In GPS network adjustment, the obtaining of the correct coordinates of the determined point is possible after determining the components of GPS vectors and aligning the networks of these vectors, while PPP requires the availability of precise products for the reference satellites orbits and clock. For that reason, surveyors can take advantage of free online GPS data processing. In this paper, the authors compare the results obtained from different sources of free online GPS data processing (AUSPOS, OPUS, CenterPoint RTX, APPS, MagicGNSS, CSRS-PPP, GAPS, and SCOUT) in terms of their accuracy, availability, and operation. This is then compared with free GPS processing software (gLAB and RTKLIB), and finally with commercial software (TBC Trimble Business Center). The results show that online processing services are more accurate than offline processing software, which indicates the strength of their algorithms and processes. The CSRS-PPP online service had the best results. The difference between the relative solution of AUSPOS and OPUS, and CSRS-PPP is insignificant.

Keywords

online GPS relative solution PPP accuracy assessment software comparison
Mohammed, I. H., Ataiwe, T. N., & Al Sharaa, H. (2021). Accuracy Assessment of a Variety of GPS Data Processing, Online Services and Software. Geomatics and Environmental Engineering, 15(4), 5–19. https://doi.org/10.7494/geom.2021.15.4.5
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