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Position Determination using multiple wireless interfaces
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. (CCSlab)
2008 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This Master’s thesis studies different ways of exploiting the signal strength measurements from wireless interfaces for position determination. Difficulties include handling the fluctuating observations and their sensitivity to obstruction. We list important factors to take into account before describing a new system based on location fingerprinting and capable of integrating observations from multiple wireless interfaces.

Compared to typical fingerprinting solutions, the training time is an order of magnitude shorter, but the location resolution is limited to locations of particular interest. In an office environment, the proposed solution determines the location correctly 80 percent of the time with sufficient precision for being used with context-aware services. In an open space environment, an incorrect location is reported 42 percent of the time.

Abstract [sv]

Det här exjobbet studerar olika sätt att använda signalstyrka från trådlösa gränssnitt för positionsbestämning. Några av svårigheterna ligger i att hantera observationernas fluktuationer och deras känslighet för obstruktion. De viktigaste faktorerna att ta hänsyn till tas upp innan ett nytt system beskrivs. Det är baserat på positionsigenkänning (location fingerprinting) och kan dra nytta av observationer från flera olika trådlösa gränssnitt.

Jämfört med vanliga metoder för positionsigenkänning är träningstiden en storleksordning kortare, men positionsupplösningen är begränsad till ett visst antal positioner av särskilt värde. I en kontorsmiljö klarar den föreslagna lösningen att korrekt bestämma positionen i 80 procent av fallen med tillräckligt hög noggrannhet för att användas till kontextmedvetna tjänster (context-aware services). I en öppen rumslösning ger lösningen en felaktig position i 42 procent av fallen.

Place, publisher, year, edition, pages
2008. , 96 p.
Series
Trita-ICT-COS, ISSN 1653-6347 ; COS/CCS 2008-08
Keyword [en]
Localization, Position determination, Wireless, Location, Fingerprinting, Context-aware services
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-91861OAI: oai:DiVA.org:kth-91861DiVA: diva2:511440
Subject / course
Computer Communication
Educational program
Master of Science in Engineering - Computer Science and Technology
Presentation
2006-12-05, Seminar room Grimeton, Isafjordsgatan 22, Kista, 13:00 (English)
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-03-23 Created: 2012-03-21 Last updated: 2013-09-09Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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Output format
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