Verification of the indoor GPS system, by comparison with calibrated coordinates and by angular reference


This paper details work carried out to verify the dimensional measurement performance of the Indoor GPS (iGPS) system; a network of Rotary-Laser Automatic Theodolites (R-LATs). Initially tests were carried out to determine the angular uncertainties on an individual R-LAT transmitter-receiver pair. A method is presented of determining the uncertainty of dimensional measurement for a three dimensional coordinate measurement machine. An experimental procedure was developed to compare three dimensional coordinate measurements with calibrated reference points. The reference standard used to calibrate these reference points was a fringe counting interferometer with the multilateration technique employed to establish three dimensional coordinates. This is an extension of the established technique of comparing measured lengths with calibrated lengths. The method was found to be practical and able to establish that the expanded uncertainty of the basic iGPS system was approximately 1 mm at a 95% confidence level. Further tests carried out on a highly optimized version of the iGPS system have shown that the coordinate uncertainty can be reduced to 0.25 mm at a 95% confidence level.

Publication DOI:
Divisions: Aston University (General)
Additional Information: The final publication is available at Springer via
Uncontrolled Keywords: coordinate uncertainty,CMM,iGPS,indoor GPS,spatial analyzer,USMN,Artificial Intelligence,Software,Industrial and Manufacturing Engineering
Publication ISSN: 1572-8145
Last Modified: 27 Jun 2024 08:40
Date Deposited: 09 Sep 2015 09:25
Full Text Link: http://link.spr ... 0845-010-0488-y
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2012-12
Published Online Date: 2010-12-05
Authors: Muelaner, J.E
Wang, Zheng
Martin, O.
Jamshidi, J.
Maropoulos, Paul G (ORCID Profile 0000-0001-6525-6216)



Version: Accepted Version

Export / Share Citation


Additional statistics for this record