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Indoor location sensing using geo-magnetism

Published: 28 June 2011 Publication History

Abstract

We present an indoor positioning system that measures location using disturbances of the Earth's magnetic field caused by structural steel elements in a building. The presence of these large steel members warps the geomagnetic field in a way that is spatially varying but temporally stable. To localize, we measure the magnetic field using an array of e-compasses and compare the measurement with a previously obtained magnetic map. We demonstrate accuracy within 1 meter 88% of the time in experiments in two buildings and across multiple floors within the buildings. We discuss several constraint techniques that can maintain accuracy as the sample space increases.

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      cover image ACM Conferences
      MobiSys '11: Proceedings of the 9th international conference on Mobile systems, applications, and services
      June 2011
      430 pages
      ISBN:9781450306430
      DOI:10.1145/1999995
      Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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      Published: 28 June 2011

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      Author Tags

      1. guiding light
      2. indoor positioning system
      3. magnetic field
      4. magnetic fingerprint
      5. positioning system
      6. systems for location determination
      7. wearable computing and innovative mobile devices

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