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Open AccessArticle

Geomagnetism-Aided Indoor Wi-Fi Radio-Map Construction via Smartphone Crowdsourcing

by Wen Li 1,2, Dongyan Wei 1,*, Qifeng Lai 1,2, Xianghong Li 1,2 and Hong Yuan 1
1
Academy of Opto-Electronics, Chinese Academy of Sciences, Beijing 100094, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(5), 1462; https://doi.org/10.3390/s18051462
Received: 13 February 2018 / Revised: 17 April 2018 / Accepted: 25 April 2018 / Published: 8 May 2018
(This article belongs to the Collection Positioning and Navigation)
Wi-Fi radio-map construction is an important phase in indoor fingerprint localization systems. Traditional methods for Wi-Fi radio-map construction have the problems of being time-consuming and labor-intensive. In this paper, an indoor Wi-Fi radio-map construction method is proposed which utilizes crowdsourcing data contributed by smartphone users. We draw indoor pathway map and construct Wi-Fi radio-map without requiring manual site survey, exact floor layout and extra infrastructure support. The key novelty is that it recognizes road segments from crowdsourcing traces by a cluster based on magnetism sequence similarity and constructs an indoor pathway map with Wi-Fi signal strengths annotated on. Through experiments in real world indoor areas, the method is proved to have good performance on magnetism similarity calculation, road segment clustering and pathway map construction. The Wi-Fi radio maps constructed by crowdsourcing data are validated to provide competitive indoor localization accuracy. View Full-Text
Keywords: indoor localization; Wi-Fi fingerprint; crowdsourcing data; magnetic field; radio-map construction indoor localization; Wi-Fi fingerprint; crowdsourcing data; magnetic field; radio-map construction
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MDPI and ACS Style

Li, W.; Wei, D.; Lai, Q.; Li, X.; Yuan, H. Geomagnetism-Aided Indoor Wi-Fi Radio-Map Construction via Smartphone Crowdsourcing. Sensors 2018, 18, 1462.

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