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Artificial Satellites

The Journal of Space Research Centre of Polish Academy of Sciences

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Volume 50, Issue 2


GNSS-Warp Software for Real-Time Precise Point Positioning

Hadaś Tomasz
  • Corresponding author
  • Wroclaw University of Environmental and Life Sciences, Institute of Geodesy and Geoinformatics ul. Grunwaldzka 53, 50-357 Wrocław
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Published Online: 2015-06-23 | DOI: https://doi.org/10.1515/arsa-2015-0005


On April 1, 2013 IGS launched the real-time service providing products for Precise Point Positioning (PPP). The availability of real-time makes PPP a very powerful technique to process GNSS signals in real-time and opens a new PPP applications opportunities. There are still, however, some limitations of PPP, especially in the kinematic mode. A significant change in satellite geometry is required to efficiently de-correlate troposphere delay, receiver clock offset, and receiver height. In order to challenge PPP limitations, the GNSS-WARP (Wroclaw Algorithms for Real-time Positioning) software has been developed from scratch at Wroclaw University of Environmental and Life Science in Poland. This paper presents the GNSS-WARP software itself and some results of GNSS data analysis using PPP and PPP-RTK (Real-Time Kinematic) technique. The results of static and kinematic processing in GPS only and GPS + GLONASS mode with final and real-time products are presented. Software performance validation in postprocessing mode confirmed that the software can be considered as a state-ofthe- art software and used for further studies on PPP algorithm development. The real-time positioning test made it possible to assess the quality of real-time coordinates, which is a few millimeters for North, East, Up in static mode, a below decimeter in kinematic mode. The accuracy and precision of height estimates in kinematic mode were improved by constraining the solution with an external, near real-time troposphere model. The software also allows estimation of real-time ZTD, however, the obtained precision of 11.2 mm means that further improvements in the software, real-time products or processing strategy are required.

Keywords: PPP; real-time positioning; IGS RTS; GNSS software; troposphere


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About the article

Received: 2015-02-13

Accepted: 2015-03-01

Published Online: 2015-06-23

Published in Print: 2015-06-01

Citation Information: Artificial Satellites, Volume 50, Issue 2, Pages 59–76, ISSN (Online) 2083-6104, DOI: https://doi.org/10.1515/arsa-2015-0005.

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© Artificial Satellites. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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