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Sources of variability in the set-up of an Indoor GPS


Reference:

Ferri, C., Mastrogiacomo, L. and Faraway, J., 2010. Sources of variability in the set-up of an Indoor GPS. International Journal of Computer Integrated Manufacturing, 23 (6), pp. 487-499.

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    Official URL:

    http://dx.doi.org/10.1080/09511921003642147

    Abstract

    An increasing demand for an extended flexibility to model types and production volumes in the manufacture of large-size assemblies has generated a growing interest in the reduction of jigs and fixtures deployment during assembly operations. A key factor enabling and sustaining this reduction is the constantly expanding availability of instruments for dimensional measurement of large-size products. However, the increasing complexity of these measurement systems and their set-up procedures may hinder the final users in their effort to assess whether the performance of these instruments is adequate for pre-specified inspection tasks. In this paper, mixed-effects and fixed-effects linear statistical models are proposed as a tool to assess quantitatively the effect of set-up procedures on the uncertainty of measurement results. This approach is demonstrated on a Metris Indoor GPS system (iGPS). The main conclusion is that more than 99% of the variability in the considered measurements is accounted for by the number of points used in the bundle adjustment procedure during the set-up phase. Also, different regions of the workspace have significantly different error standard deviations and a significant effect on the transient duration of measurement. This is expected to affect adversely the precision and unbiasedness of measurements taken with Indoor GPS when tracking moving objects.

    Details

    Item Type Articles
    CreatorsFerri, C., Mastrogiacomo, L. and Faraway, J.
    DOI10.1080/09511921003642147
    DepartmentsFaculty of Science > Mathematical Sciences
    Faculty of Engineering & Design > Mechanical Engineering
    Research CentresInnovative Design & Manufacturing Research Centre (IdMRC)
    Publisher StatementCarlo_Ferri_indoor.pdf: This is an electronic version of an article published in: Ferri, C., Mastrogiacomo, L., Faraway, J., 2010. Sources of variability in the set-up of an Indoor GPS. International Journal of Computer Integrated Manufacturing, 23 (6), pp. 487-499. The International Journal of Computer Integrated Manufacturing is available online at: http://www.informaworld.com/openurl?genre=journal&issn=0951-192X
    RefereedYes
    StatusPublished
    ID Code20961

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