Smartphone-based indoor pedestrian tracking using geo-magnetic observations

Article type: Research Article

Authors: Lee, Sungnam | Chon, Yohan | Cha, Hojung

Affiliations: Department of Computer Science, Yonsei University, Seoul, Korea

Note: [] Corresponding author: Hojung Cha, Department of Computer Science, Yonsei University, Seoul, Korea. E-mail: hjcha@\linebreak yonsei.ac.kr

Abstract: With the widespread use of smartphones, the use of location-based services (LBS) with smartphones has become an active research issue. The accurate measurement of user location is necessary to provide LBS. While outdoor locations are easily obtained with GPS, indoor location information is difficult to acquire. Previous work on indoor location tracking systems often relied on infrastructures that are influenced by environmental changes and temporal differences. Several studies have proposed infrastructure-less systems that are independent of the surroundings, but these works generally required non-trivial computation time or energy costs. In this paper, we propose an infrastructure-less pedestrian tracking system in indoor environments. The system uses accelerometers and magnetic sensors in smartphones without pre-installed infrastructure. We reduced the cumulative error of location tracking by geo-magnetic observations at corners and spots with magnetic fluctuations. In addition, we developed a robust estimation model that is tolerant to false positives, as well as a mobility model that reflects the characteristics of multiple sensors. Extensive evaluation in a real environment indicates that our system is accurate and cost-effective.

Keywords: Indoor localization system, unconstrained device placements, infrastructure-free

DOI: 10.3233/MIS-130156

Journal: Mobile Information Systems, vol. 9, no. 2, pp. 123-137, 2013