COMPASS: A Probabilistic Indoor Positioning System Based on 802.11 and Digital Compasses


King, Thomas ; Kopf, Stephan ; Haenselmann, Thomas ; Lubberger, Christian ; Effelsberg, Wolfgang


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URL: https://ub-madoc.bib.uni-mannheim.de/1276
URN: urn:nbn:de:bsz:180-madoc-12762
Document Type: Working paper
Year of publication: 2006
The title of a journal, publication series: Technical Reports
Volume: 06-012
Place of publication: Mannheim
Publication language: English
Institution: School of Business Informatics and Mathematics > Sonstige - Fakultät für Mathematik und Informatik
MADOC publication series: Veröffentlichungen der Fakultät für Mathematik und Informatik > Institut für Informatik > Technical Reports
Subject: 004 Computer science, internet
Subject headings (SWD): Objektverfolgung , Positionierung , IEEE 802.11 , Standortbezogener Dienst
Abstract: Positioning systems are one of the key elements required by context-aware application and location-based services. This paper presents the design, implementation and anaylsis of a positioning system called COMPASS which is based on 802.11 compliant network infrastructure and digital compasses. On the mobile device, COMPASS samples the signal strength values of different access points in communication range and utilizes the orientation of the user to preselect a subset of the training data. The remaining training data is used by a probabilistic position determination algorithm to determine the position of the user. While prior systems show only limited accuracy due to blocking effects caused by human bodies, we apply digital compasses to detect the orientations of the users so that we can handle these blocking effects. After a short period of training our approach achieves an average error distance of less than 1.65~meters in our experimental environment of 312 square meters.
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King, Thomas ; Kopf, Stephan ; Haenselmann, Thomas ; Lubberger, Christian ; Effelsberg, Wolfgang (2006) COMPASS: A Probabilistic Indoor Positioning System Based on 802.11 and Digital Compasses. Open Access Technical Reports Mannheim 06-012 [Working paper]
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