Urban area GPS positioning accuracy using ASG-EUPOS POZGEO service as a function of session duration

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GNSS observations carried out in a network of Continuously Operating Reference Station (CORS) are a complex systems which offer post-processing as well as corrections sent in realtime. In Poland, such a system has been in operation since June 2008, known as the Polish Active Geodetic Network (ASG-EUPOS).

Usually the measurements performed in real time characterized lower accuracy than static measurements. For users who demand the highest precision results the post-processing services are provided.

The paper presents an analysis of the position determination accuracy using ASG-EUPOS POZGEO service. It is well known that the final accuracy is e.g. the measuring conditions, time of observations or number of measured frequencies dependent. We processed 4 consecutive days of GPS data to determine how the accuracy of derived positional coordinates depends on the length of the observing session, the characteristics of horizon visibility on points and the used in post-processing observations (L1 or L1+L2). The POZGEO results show that horizontal accuracies of about 1-2 cm and vertical accuracies of 4 cm are achievable provided 0.5 hours dual frequency GPS data. The accuracy clearly decreases for point measured under conditions of strongly limited satellite availability


  • Bakuła M., Przestrzelski P. (2013): Technologia wiarygodnego pozycjonowania RTK GPS/GLONASS, Przegląd Geodezyjny, No 7: 3-9.

  • Bosy J., Oruba A., Graszka W., Leończyk M., Ryczywolski M., (2008): ASG-EUPOS densification of EUREF Permanent Network on the territory of Poland. Reports on Geodesy, No. 2 (85): 105-112.

  • Dawidowicz K., (2012): GNSS satellite leveling using the ASG-EUPOS system services. Technical Sciences, No. 15(1): 35-48.

  • Eckle M. C., Snay R. A., Soler T., Cline M. W., Mader G. L. (2001): Accuracy of GPSderived relative positions as a function of interstation distance and observing-session duration. Journal of Geodesy, Vol. 75: 633-640.

  • Edwards S. J., Clarke P. J., Penna N. T., Goebell S. (2010): An examination of network RTK GPS services in Great Britain. Survey Review, No. 42(316): 107-121.

  • El-Mowafy A. (2011): Analysis of web-based GNSS post-processing services for static and kinematic positioning using short data spans. Survey Review, No. 43(323): 535-549.

  • Erhu W., Hua Ch., Zhiguo A. (2006): VRS Virtual Observations Generation Algorithm. Journal of Global Positioning Systems, Vol. 5, No. 1-2: 76-81.

  • Euler H.J., Keenan C.R., Zebhauser B.E. Wübbena G. (2001): Study of a Simplified Approach in Utilizing Information from Permanent Reference Station Arrays. Proc. ION GPS 2001, Salt Lake City.

  • Figurski M., Kamiński P., Kroszyński K., Szafranek K. (2009): ASG-EUPOS monitoring with referemce to EPN. Artificial satellites, Vol. 44, no. 3: 85-04.

  • Figurski M., Bogusz J., Bosy J., Kontny B., Krankowski A., Wielgosz P.(2011): „ASG+”: project for improving Polish multifunctional precise satellite positioning system. Reports on Geodesy, No 2(91): 51-58.

  • Hadaś J., Bosy J. (2009): Niwelacja satelitarna GNSS z wykorzystaniem serwisu NAWGEO system ASG-EUPOS. Acta Sci. Pol., Geodesia et Descripto Terrarum, No. 8(2): 53-66.

  • Kadaj R. (2010): Application of Schreiber’s type difference observation system for elaboration of a session of static GPS measurements; Biuletyn Wojskowej Akademi Technicznej, Vol. LIX, No. 2 (658): 85-106.

  • Kowalczyk K., Tymoszczyk T. (2012): Opracowanie trójwymiarowego modelu dna stawu w aplikacji SURFER przy użyciu danych z pomiaru GPS RTK. Zeszyty Naukowe Politechniki Rzeszowskie, No. 283(59): 197-206.

  • Kudrys J., Krzyżek R. (2011): Analysis of Coordinates Time Series Obtained Using the NAWGEO Service of the ASG-EUPOS System. Geomatics and Environmental Engineering, Vol. 5 No. 4: 39-47.

  • Snay R. A., Soler T. (2008): Continuously Operating Reference Station (CORS): History, Applications, and Future Enhancements. Journal of Surveying Engineering, Vol. 134, No. 4: 95-104.

  • Wanninger L. (1997): Real-Time Differential GPS-Error Modeling in regional Reference Stations Networks. Proc. IAG Symp 118, Rio de Janerio, 86-92.

  • Wanninger L. (2004): Introduction to Network RTK. Paper presented at the International Association to Geodesy meeting, Working Group 4.5.1: Network RTK, Dresden, Germany, available at: http://www.wasoft.de/e/iagwg451/intro/introduction.html.

  • Wegener V. and Wanninger L. (2005): Communication Options for Network RTK. International Association of Geodesy. Working Group 4.5.1: Network RTK. Available at: http://www.network-rtk.info/wegener/communication.html.

  • WiśniewskiB., Bruniecki K., Moszyński M. (2013): Evaluation of RTKLIB's Positioning Accuracy Using low-cost GNSS Receiver and ASG-EUPOS. The International Journal on Marine Navigation and Safety of Sea Transportation Vol 7, No 1: 79-85.

Artificial Satellites

The Journal of Space Research Centre of Polish Academy of Sciences

Journal Information

CiteScore 2016: 0.33

SCImago Journal Rank (SJR) 2016: 0.179
Source Normalized Impact per Paper (SNIP) 2016: 0.560


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