No need to war-drive: Unsupervised indoor localization

He Wang, Souvik Sen, Ahmed Elgohary, Moustafa Farid, Moustafa Youssef, Romit Roy Choudhury

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We propose UnLoc, an unsupervised indoor localization scheme that bypasses the need for war-driving. Our key observation is that certain locations in an indoor environment present identifiable signatures on one or more sensing dimensions. An elevator, for instance, imposes a distinct pattern on a smartphone's accelerometer; a corridor-corner may overhear a unique set of WiFi access points; a specific spot may experience an unusual magnetic fluctuation. We hypothesize that these kind of signatures naturally exist in the environment, and can be envisioned as internal landmarks of a building. Mobile devices that "sense" these landmarks can recalibrate their locations, while dead-reckoning schemes can track them between landmarks. Results from 3 different indoor settings, including a shopping mall, demonstrate median location errors of 1:69m. War-driving is not necessary, neither are floorplans the system simultaneously computes the locations of users and landmarks, in a manner that they converge reasonably quickly. We believe this is an unconventional approach to indoor localization, holding promise for real-world deployment.

Original languageEnglish (US)
Title of host publicationMobiSys'12 - Proceedings of the 10th International Conference on Mobile Systems, Applications, and Services
Pages197-210
Number of pages14
DOIs
StatePublished - 2012
Externally publishedYes
Event10th International Conference on Mobile Systems, Applications, and Services, MobiSys'12 - Low Wood Bay, Lake District, United Kingdom
Duration: Jun 25 2012Jun 29 2012

Publication series

NameMobiSys'12 - Proceedings of the 10th International Conference on Mobile Systems, Applications, and Services

Other

Other10th International Conference on Mobile Systems, Applications, and Services, MobiSys'12
CountryUnited Kingdom
CityLow Wood Bay, Lake District
Period6/25/126/29/12

Keywords

  • landmarks
  • location
  • mobile phones
  • recursion
  • sensing

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Computer Science Applications

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