Indoor localization with Wi-Fi fine timing measurements through range filtering and fingerprinting methods

Sami Huilla, Chrysanthos Pepi, Michalis Antoniou, Christos Laoudias, Seppo Horsmanheimo, Sergio Lembo, Matti Laukkanen, Georgios Ellinas

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Wi-Fi technology has been thoroughly studied for indoor localization. This is mainly due to the existing infrastructure inside buildings for wireless connectivity and the uptake of mobile devices where Wi-Fi location-dependent measurements, e.g., timing and signal strength readings, are readily available to determine the user location. To enhance the accuracy of Wi-Fi solutions, a two-way ranging approach was recently introduced into the IEEE 802.11 standard for the provision of Fine Timing Measurements (FTM). Such measurements enable a more reliable estimation of the distance between FTM-capable Wi-Fi access points and user-carried devices; thus, promising to deliver meter-level location accuracy. In this work, we propose two novel solutions that leverage FTM and follow different approaches, which have not been investigated in the literature. The first solution is based on an Unscented Kalman Filter (UKF) algorithm to process FTM ranging measurements, while the second solution relies on an FTM fingerprinting method. Experimental results using real-life data collected in a typical office environment demonstrate the effectiveness of both solutions, while the FTM fingerprinting approach demonstrated 1.12m and 2.13m localization errors for the 67-th and 95-th percentiles, respectively. This is a two to three times improvement over the traditional Wi-Fi signal strength fingerprinting approach and the UKF ranging algorithm.

Original languageEnglish
Title of host publication2020 IEEE 31st Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2020
PublisherIEEE Institute of Electrical and Electronic Engineers
Number of pages7
ISBN (Electronic)978-1-7281-4490-0
ISBN (Print)978-1-7281-4491-7
DOIs
Publication statusPublished - Aug 2020
MoE publication typeA4 Article in a conference publication
Event31st IEEE Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2020: Online - Virtual, London, United Kingdom
Duration: 31 Aug 20203 Sep 2020

Publication series

SeriesIEEE International Symposium on Personal, Indoor, and Mobile Radio Communications Workshops
Number31
ISSN2166-9570

Conference

Conference31st IEEE Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2020
Abbreviated titlePIMRC 2020
CountryUnited Kingdom
CityLondon
Period31/08/203/09/20

Keywords

  • Fine Timing Measurements
  • Fingerprinting
  • Indoor localization
  • Unscented Kalman Filter
  • Wi-Fi

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