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Journal of Applied Geodesy

Editor-in-Chief: Kahmen, Heribert / Rizos, Chris

4 Issues per year

CiteScore 2016: 1.09

SCImago Journal Rank (SJR) 2016: 0.367
Source Normalized Impact per Paper (SNIP) 2016: 0.908

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Volume 11, Issue 4


Indoor positioning using differential Wi-Fi lateration

Guenther Retscher
  • Corresponding author
  • Department of Geodesy and Geoinformation, TU Wien – Vienna University of Technology, Vienna, Austria
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/ Thomas Tatschl
Published Online: 2017-09-01 | DOI: https://doi.org/10.1515/jag-2017-0011


For Wi-Fi positioning usually location fingerprinting or (tri)lateration are employed whereby the received signal strengths (RSSs) of the surrounding Wi-Fi Access Points (APs) are scanned on the mobile devices and used to perform localization. Within the scope of this study, the position of a mobile user is determined on the basis of lateration. Two new differential approaches are developed and compared to two common models, i.e., the one-slope and multi-wall model, for the conversion of the measured RSS of the Wi-Fi signals into ranges. The two novel methods are termed DWi-Fi as they are derived either from the well-known DGPS or VLBI positioning principles. They make use of a network of reference stations deployed in the area of interest. From continuous RSS observations on these reference stations correction parameters are derived and applied by the user in real-time. This approach leads to a reduced influence of temporal and spatial variations and various propagation effects on the positioning result. In practical use cases conducted in a multi-storey office building with three different smartphones, it is proven that the two DWi-Fi approaches outperform the common models as static positioning yielded to position errors of about 5 m in average under good spatial conditions.

Keywords: Wi-Fi positioning; lateration; differential approach; path loss models; RSS to range conversion


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About the article

Received: 2017-03-28

Accepted: 2017-08-14

Published Online: 2017-09-01

Published in Print: 2017-12-01

Citation Information: Journal of Applied Geodesy, Volume 11, Issue 4, Pages 249–269, ISSN (Online) 1862-9024, ISSN (Print) 1862-9016, DOI: https://doi.org/10.1515/jag-2017-0011.

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