Evaluating The Performance of Open Source GNSS Online Post-Processing Services
DOI:
https://doi.org/10.24191/bej.v22i2.952Keywords:
GNSS, Online Processing Services, IGSAbstract
Various organisations have recently developed online processing services for GNSS data. However, due to limited information about their performance and accuracy, users struggle to make informed decisions. The objectives of this study are to assess the accuracy of the positioning solutions provided by the three online GNSS processing services (OPUS, AUSPOS, and CSRS-PPP) and determine the optimum observation times needed to achieve high accuracy in GNSS post-processing services. The study was conducted at UiTM Shah Alam, Selangor, with field observations performed at four selected control points using the static observation technique. The coordinates of control points were estimated using TBC software and online processing services, and the differences between the coordinates from these services and TBC software were computed. The results indicate that AUSPOS outperforms other services in terms of accuracy across different observation periods (4 hours, 3 hours, and 2 hours). For the 4-hour observation, the RMSE values are ±0.020 m for northing, ±0.022 m for easting, and ±0.028 m for ellipsoidal height. In the 3-hour observation, AUSPOS also shows the smallest RMSE values of ±0.028 m in northing, ±0.023 m in easting, and ±0.034 m in ellipsoidal height. Similarly, in the 2-hour observation, AUSPOS maintains the best performance with RMSE values of ±0.067 m for northing, ±0.073 m for easting, and ±0.082 m for ellipsoidal height. In conclusion, the study demonstrates that among the three online GNSS processing services evaluated, AUSPOS consistently delivers the highest accuracy across different observation durations, particularly in the 4-hour observation. While CSRS-PPP follows closely behind, OPUS shows the least accuracy, especially for shorter observation periods.
References
Bulbul, S., Bilgen, B., & Inal, C. (2021). The performance assessment of Precise Point Positioning (PPP) under various observation conditions. Measurement, 171, 108780. https://doi.org/10.1016/j.measurement.2020.108780
Dawoud, S. (2012). GNSS Principles and Comparison. Postdam University https://www.semanticscholar.org/paper/GNSS-principles-and-comparison-Dawoud/f77d36966cfd66be3d1feefe9faae1a6aa7e2756#citing-papers
Ghoddousi-Fard, R., Dare, P. Online GPS processing services: an initial study. GPS Solut 10, 12–20 (2006). https://doi.org/10.1007/s10291-005-0147-5
Herbert, T. A. T. A., & RAUFU, I. O. (2019). Comparative Analysis of Different Online GNSS Processing Services. Lagos J. Environ. Studies, 10(1), 1-12. http://ljes.unilag.edu.ng/article/view/941/751
Hofmann-Wellenhof, B., Lichtenegger, H., & Wasle, E. (2008). GNSS-Global Navigation Satellite Systems: GPS, GLONASS, Galileo, and more. Choice Reviews Online, 45(11), 45–6185. https://doi.org/10.5860/choice.45-6185
Janssen V. and McElroy S. (2020) Evaluating the performance of AUSPOS solutions in NSW, Proceedings of APAS Webinar Series 2020 (AWS2020), 5 May – 30 June, 3-19.
JUPEM. (2021). Garis Panduan Teknikal Ukur Aras Global Navigation Satellite System (GNSS). Kuala Lumpur: KPU Circular vol.6.
https://www.jupem.gov.my/storage/upload/pekeliling/17cf6-pkpup-6-2021.pdf
M. Abd-Elazeem, A. Farah and A. F. Farrag, “Assessment Study of Using Online (CSRS) GPS-PPP Service for Mapping Applications in Egypt,” Journal of Geodetic Science, Vol. 1, No. 3, 2011, pp. 233-239.
http://dx.doi.org/10.2478/v10156-011-0001-3
Soko, M., Md Din, A. H., Alihan, N. S. A., & Mohd Azmi, N. H. (2022). Evaluation of free GPS online processing services for surveying and mapping applications in Malaysia. Evaluation of Free GPS Online Processing Services, 106–124.
Teunissen, P. J., & Montenbruck, O. (2017). Springer Handbook of Global Navigation Satellite Systems. In Springer eBooks. https://doi.org/10.1007/978-3-319-42928-1
Yang, W., Liu, Y., & Liu, F. (2020). An Improved Relative GNSS Tracking Method Utilizing Single Frequency Receivers. Sensors (Basel, Switzerland), 20(15), 4073. https://doi.org/10.3390/s20154073
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Copyright (c) 2025 Muhammad Nasruddin Yusri, Amir Sharifuddin Ab Latip, Ami Hassan Md Din, Abdul Aziz Ab Rahman, Sharifah Nur Attasyah Mohd Zaiddien

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