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Sensors 2015, 15(12), 30319-30339;

Towards a Decentralized Magnetic Indoor Positioning System

Institute for Computing in Civil Engineering & Geo Information Systems, Rheinisch-Westfälische Technische Hochschule Aachen University, Mies-van-der-Rohe-Str. 1, Aachen 52074, Germany
Author to whom correspondence should be addressed.
Academic Editors: Kourosh Khoshelham and Sisi Zlatanova
Received: 25 August 2015 / Revised: 18 November 2015 / Accepted: 24 November 2015 / Published: 4 December 2015
(This article belongs to the Special Issue Sensors for Indoor Mapping and Navigation)
PDF [2331 KB, uploaded 4 December 2015]


Decentralized magnetic indoor localization is a sophisticated method for processing sampled magnetic data directly on a mobile station (MS), thereby decreasing or even avoiding the need for communication with the base station. In contrast to central-oriented positioning systems, which transmit raw data to a base station, decentralized indoor localization pushes application-level knowledge into the MS. A decentralized position solution has thus a strong feasibility to increase energy efficiency and to prolong the lifetime of the MS. In this article, we present a complete architecture and an implementation for a decentralized positioning system. Furthermore, we introduce a technique for the synchronization of the observed magnetic field on the MS with the artificially-generated magnetic field from the coils. Based on real-time clocks (RTCs) and a preemptive operating system, this method allows a stand-alone control of the coils and a proper assignment of the measured magnetic fields on the MS. A stand-alone control and synchronization of the coils and the MS have an exceptional potential to implement a positioning system without the need for wired or wireless communication and enable a deployment of applications for rescue scenarios, like localization of miners or firefighters. View Full-Text
Keywords: synchronization; architecture; real-time clock; RTC; RIOT-OS; DS3234; TDMA; real time; periodic tasks; embedded system synchronization; architecture; real-time clock; RTC; RIOT-OS; DS3234; TDMA; real time; periodic tasks; embedded system

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kasmi, Z.; Norrdine, A.; Blankenbach, J. Towards a Decentralized Magnetic Indoor Positioning System. Sensors 2015, 15, 30319-30339.

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