Study of the uncertainty of angle measurement for a rotary-laser automatic theodolite (R-LAT)

Jody E Muelaner, Zheng Wang, Jafar Jamshidi, Paul G Maropoulos, Antony R Mileham, E B Hughes, A B Forbes

Research output: Contribution to journalArticle

43 Citations (Scopus)
130 Downloads (Pure)


This paper shows how the angular uncertainties can be determined for a rotary-laser automatic theodolite of the type used in (indoor-GPS) iGPS networks. Initially, the fundamental physics of the rotating head device is used to propagate uncertainties using Monte Carlo simulation. This theoretical element of the study shows how the angular uncertainty is affected by internal parameters, the actual values of which are estimated. Experiments are then carried out to determine the actual uncertainty in the azimuth angle. Results are presented that show that uncertainty decreases with sampling duration. Other significant findings are that uncertainty is relatively constant throughout the working volume and that the uncertainty value is not dependent on the size of the reference angle.
Original languageEnglish
Pages (from-to)217-229
Number of pages13
JournalProceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
Issue number3
Publication statusPublished - 1 Mar 2009


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