Indoor location sensing using geo-magnetism

Authors:
Jaewoo Chung;Matt Donahoe;Chris Schmandt;Ig-Jae Kim;Pedram Razavai;Micaela Wiseman
Affiliations:
MIT, Cambridge, MA, USA;MIT, Cambridge, MA, USA;MIT, Cambridge, MA, USA;MIT, Cambridge, MA, USA;MIT, Cambridge, MA, USA;MIT, Cambridge, MA, USA
Venue:
MobiSys '11 Proceedings of the 9th international conference on Mobile systems, applications, and services
Year:
2011

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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.