Key Factors for Position Errors in 802.11-based Positioning Systems

King, Thomas ; Haenselmann, Thomas ; Effelsberg, Wolfgang

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URN: urn:nbn:de:bsz:180-madoc-13974
Document Type: Working paper
Year of publication: 2007
The title of a journal, publication series: Technical Reports
Volume: 07-003
Place of publication: Mannheim
Publication language: English
Institution: School of Business Informatics and Mathematics > Sonstige - Fakultät für Wirtschaftsinformatik und Wirtschaftsmathematik
MADOC publication series: Veröffentlichungen der Fakultät für Mathematik und Informatik > Institut für Informatik > Technical Reports
Subject: 004 Computer science, internet
Subject headings (SWD): IEEE 802.11 , Positionierung
Individual keywords (German): Positionierungssysteme , 802.11 , Einflussfaktoren , Positions-basierte Anwendungen
Keywords (English): positioning systems , location systems , location-based services , ubiquious computing
Abstract: Indoor positioning systems based on 802.11 and fingerprints offer reasonably low position errors. We study the key factors for position errors by systematically investigating (1) the number of access points, (2) the number of samples in the training phase, (3) the number of samples in the position determination phase, and (4) the setup of the grid of reference points. Further, we squeeze out the best of the positioning system by selecting advantageous values for these parameters. For our study, we utilize a test environment with a size of about 312 square meters that is covered with 612 reference points arranged in an equally spaced grid.

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