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Proceedings Paper

Mobile location without network-based synchronization or how to do E-OTD without LMUs
Author(s): Chris R. Drane; Peter Duffett-Smith; Simon Hern; J. Brice
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Paper Abstract

This paper describes an enhancement of the Enhanced-Observed Time-Difference (E-OTD) method of locating mobile phones in unsynchronized networks (e.g. GSM) which does away with the need to deploy additional network monitoring equipment. It is therefore a method of locating mobile telephones that does not require an external source of synchronization. The timing measurements from many mobile phones made within a few minutes of each other are combined to estimate simultaneously both the time offsets between the base stations and the positions of all the mobile phones contributing measurements. Experimental and theoretical results show that the method performs as well as standard E-OTD, but without the need for Location Measurement Units (LMUs).

Paper Details

Date Published: 6 August 2003
PDF: 8 pages
Proc. SPIE 5084, Location Services and Navigation Technologies, (6 August 2003); doi: 10.1117/12.488154
Show Author Affiliations
Chris R. Drane, Cambridge Positioning Systems Pty Ltd. (Australia)
Peter Duffett-Smith, Cambridge Positioning Systems Ltd. (United Kingdom)
Simon Hern, Cambridge Positioning Systems Ltd. (United Kingdom)
J. Brice, Cambridge Positioning Systems Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 5084:
Location Services and Navigation Technologies
Yilin Zhao, Editor(s)

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