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Sources of variability in the set-up of an indoor GPS
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Ferri, Carlo, Mastrogiacomo, Luca and Faraway, Julian (2010) Sources of variability in the set-up of an indoor GPS. International Journal of Computer Integrated Manufacturing, 23 (6). pp. 487-499. doi:10.1080/09511921003642147 ISSN 0951-192X.
An open access version can be found in:
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.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||
Journal or Publication Title: | International Journal of Computer Integrated Manufacturing | ||||||
Publisher: | Taylor & Francis Ltd. | ||||||
ISSN: | 0951-192X | ||||||
Official Date: | 21 May 2010 | ||||||
Dates: |
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Volume: | 23 | ||||||
Number: | 6 | ||||||
Page Range: | pp. 487-499 | ||||||
DOI: | 10.1080/09511921003642147 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Open Access Version: |
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