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Open AccessArticle

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
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Academic Editors: Kourosh Khoshelham and Sisi Zlatanova
Sensors 2015, 15(12), 30319-30339; https://doi.org/10.3390/s151229799
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)
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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Kasmi, Z.; Norrdine, A.; Blankenbach, J. Towards a Decentralized Magnetic Indoor Positioning System. Sensors 2015, 15, 30319-30339.

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