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Svantesson, Claes-GöranORCID iD iconorcid.org/0009-0002-0025-2331
Publications (2 of 2) Show all publications
Guillory, J., Truong, D., Wallerand, J.-P., Svantesson, C.-G., Herbertsson, M. & Bergstrand, S. (2023). An SI-traceable multilateration coordinate measurement system with half the uncertainty of a laser tracker. Measurement science and technology, 34(6), Article ID 065016.
Open this publication in new window or tab >>An SI-traceable multilateration coordinate measurement system with half the uncertainty of a laser tracker
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2023 (English)In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 34, no 6, article id 065016Article in journal (Refereed) Published
Abstract [en]

We have validated the performance of a prototype coordinate measurement system based on multilateration by comparing it to a laser tracker, i.e. a well-proven instrument widely used in the industry. After establishing the uncertainty budget of the different systems, we performed position measurements with both instruments on common targets. Using the estimated uncertainties associated with the measurements, we found that the multilateration system provided lower position uncertainties than the laser tracker: on average 18 µm versus 33 µm for distances up to 12 m. The uncertainties represented by confidence ellipsoids are compatible between the two systems: for confidence regions of 95% probability, they overlap as expected, i.e. in 94% of the cases. We also measured the length of a 0.8 m long reference scale bar with the multilateration system at an error of only 2 µm. This cross-comparison is a new and key step in the characterization of this SI-traceable multilateration system. © 2023 The Author(s).

Place, publisher, year, edition, pages
Institute of Physics, 2023
Keywords
coordinate measurement system, large volume metrology, laser tracker, multilateration, Budget control, Coordinate measuring machines, Uncertainty analysis, Confidence region, Coordinate measurement systems, Large volumes, Multilateration system, Performance, Position uncertainties, Uncertainty, Uncertainty budget, Time difference of arrival
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-64315 (URN)10.1088/1361-6501/acc26a (DOI)2-s2.0-85150897786 (Scopus ID)
Note

Funding details: Horizon 2020 Framework Programme, H2020; Funding details: European Metrology Programme for Innovation and Research, EMPIR; Funding text 1: This work was partially funded by Joint Research Project (JRP) 17IND03 LaVA, project that has received funding from the European Metrology Programme for Innovation and Research (EMPIR) co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation programme.

Available from: 2023-05-05 Created: 2023-05-05 Last updated: 2024-03-19Bibliographically approved
Bergstrand, S., Herbertsson, M., Rieck, C., Spetz, J., Svantesson, C.-G. & Haas, R. (2019). A gravitational telescope deformation model for geodetic VLBI. Journal of Geodesy, 93(5), 669-680
Open this publication in new window or tab >>A gravitational telescope deformation model for geodetic VLBI
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2019 (English)In: Journal of Geodesy, ISSN 0949-7714, E-ISSN 1432-1394, Vol. 93, no 5, p. 669-680Article in journal (Refereed) Published
Abstract [en]

We have measured the geometric deformations of the Onsala 20 m VLBI telescope utilizing a combination of laser scanner, laser tracker, and electronic distance meters. The data put geometric constraints on the electromagnetic raypath variations inside the telescope. The results show that the propagated distance of the electromagnetic signal inside the telescope differs from the telescope’s focal length variation, and that the deformations alias as a vertical or tropospheric component. We find that for geodetic purposes, structural deformations of the telescope are more important than optic properties, and that for geodetic modelling the variations in raypath centroid rather than focal length should be used. All variations that have been identified as significant in previous studies can be quantified. We derived coefficients to model the gravitational deformation effect on the path length and provide uncertainty intervals for this model. The path length variation due to gravitational deformation of the Onsala 20 m telescope is in the range of 7–11 mm, comparing elevation 0$$^{\circ }$$∘and 90$$^{\circ }$$∘, and can be modelled with an uncertainty of 0.3 mm.

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-36562 (URN)10.1007/s00190-018-1188-1 (DOI)2-s2.0-85053236319 (Scopus ID)
Available from: 2018-12-06 Created: 2018-12-06 Last updated: 2024-03-19Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0009-0002-0025-2331

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