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Publications (10 of 17) 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
Telada, S., Kajima, M., Lai, C., Tonmueanwai, A., Cox, P., Chiu, H., . . . Eom, T. (2022). Report on APMP key comparison: calibration of line scale (APMP.L-K7). Metrologia, 59(1A), Article ID 04006.
Open this publication in new window or tab >>Report on APMP key comparison: calibration of line scale (APMP.L-K7)
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2022 (English)In: Metrologia, Vol. 59, no 1A, article id 04006Article in journal (Refereed) Published
Abstract [en]

A regional key comparison on calibration of a line scale, APMP.L-K7 was conducted. KRISS acted as the pilot laboratory, and a total of 15 National Metrology Institutes, (10 from APMP, 3 from EURAMET, 1 from SIM, and 1 from AFRIMETS) have participated in this comparison, where a 500 mm line scale made of low thermal expansion material was circulated during the period from April 2015 to December 2016. This document presents the approved report of the results of this comparison. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-63512 (URN)10.1088/0026-1394/59/1a/04006 (DOI)
Available from: 2023-01-30 Created: 2023-01-30 Last updated: 2023-06-08Bibliographically approved
Bergstrand, S., Jarlemark, P. & Herbertsson, M. (2020). Quantifying errors in GNSS antenna calibrations: Towards in situ phase center corrections. Journal of Geodesy, 94(10), Article ID 105.
Open this publication in new window or tab >>Quantifying errors in GNSS antenna calibrations: Towards in situ phase center corrections
2020 (English)In: Journal of Geodesy, ISSN 0949-7714, E-ISSN 1432-1394, Vol. 94, no 10, article id 105Article in journal (Refereed) Published
Abstract [en]

We evaluated the performance of GNSS absolute antenna calibrations and its impact on accurate positioning with a new assessment method that combines inter-antenna differentials and laser tracker measurements. We thus separated the calibration method contributions from those attainable by various geometric constraints and produced corrections for the calibrations. We investigated antennas calibrated by two IGS-approved institutions and in the worst case found the calibration’s contribution to the vertical component being in excess of 1 cm on the ionosphere-free frequency combination L3. In relation to nearby objects, we gauge the 1 σ accuracies of our method to determine the antenna phase centers within ±0.38 mm on L1 and within ±0.62 mm on L3, the latter applicable to global frame determinations where atmospheric influence cannot be neglected. In addition to antenna calibration corrections, the results can be used with an equivalent tracker combination to determine the phase centers of as-installed individual receiver antennas at system critical sites to the same level without compromising the permanent installations. © 2020, The Author(s).

Place, publisher, year, edition, pages
Springer Science and Business Media Deutschland GmbH, 2020
Keywords
Antenna, Calibration, GNSS, Local tie, PCC, PCO, PCV, Phase center offset, Phase center variation, Terrestrial reference frame, TRF, correction, geodesy, geometry, in situ measurement, ionosphere, performance assessment
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-50427 (URN)10.1007/s00190-020-01433-0 (DOI)2-s2.0-85092476245 (Scopus ID)
Note

Funding details: Horizon 2020 Framework Programme, H2020, SIB60; Funding details: European Metrology Programme for Innovation and Research, EMPIR; Funding text 1: This work has received funding from the European Metrology Programme for Innovation and Research EMPIR programme co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation programme. Funder ID: 10.13039/100014132, Grant number 18SIB01 GeoMetre. Funding has also been received from Lantmäteriet in Close3 and the European Metrology Research Programme EMRP, Grant SIB60. Open access funding provided by RISE Research Institutes of Sweden.

Available from: 2020-11-30 Created: 2020-11-30 Last updated: 2024-03-03Bibliographically 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
Bergstrand, S. & Ralf, S. (2016). Activities of the IERS Working Group on Site Survey and Co-location. In: Dirk Behrend, Karen D. Baver, and Kyla L. Armstrong (Ed.), International VLBI Service for Geodesy and Astrometry 2016 General Meeting Proceedings: "New Horizons with VGOS". Paper presented at Ninth IVS General Meeting (GM2016), March 13–17, 2016, Johannesburg, South Africa (pp. 113-117). Greenbelt, MD: National Aeronautics and Space Administration
Open this publication in new window or tab >>Activities of the IERS Working Group on Site Survey and Co-location
2016 (English)In: International VLBI Service for Geodesy and Astrometry 2016 General Meeting Proceedings: "New Horizons with VGOS" / [ed] Dirk Behrend, Karen D. Baver, and Kyla L. Armstrong, Greenbelt, MD: National Aeronautics and Space Administration , 2016, p. 113-117Conference paper, Published paper (Other academic)
Abstract [en]

The objective of the International Earth Rotation and Reference Systems Service (IERS) Working Group on Site Survey and Co-location is to improve local measurements at space geodesy sites. We appointed dedicated Points of Contact (POC) with the four different services of IERS as well as the NASA Space Geodesy Project in order to improve the efficiency of internal communication within the working group. Following the REFAG2014 conference, the POCs agreed on a common and general terminology on local ties that clarifies the communication regarding site surveying and co-location issues between and within the IERS services. We give brief introductions to the different observation techniques and mention some contemporary issues related to site surveying and co-location.

Place, publisher, year, edition, pages
Greenbelt, MD: National Aeronautics and Space Administration, 2016
Series
NASA/CP-2016-219016
Keywords
Site survey, local tie, IERS, co-location
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:ri:diva-29174 (URN)
Conference
Ninth IVS General Meeting (GM2016), March 13–17, 2016, Johannesburg, South Africa
Available from: 2017-03-31 Created: 2017-03-31 Last updated: 2023-06-08Bibliographically approved
Matus, M., Haas, S., Piree, H., Gavalyugov, V., Tamakyarska, D., Thalmann, R., . . . Franke, P. (2016). Key Comparison EURAMET.L-K1.2011 Measurement of gauge blocks by interferometry (ed.). Metrologia, 53(1A)
Open this publication in new window or tab >>Key Comparison EURAMET.L-K1.2011 Measurement of gauge blocks by interferometry
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2016 (English)In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 53, no 1AArticle in journal (Refereed) Published
Abstract [en]

The key comparison EURAMET.L-K1.2011 on gauge blocks was carried out in the framework of a EURAMET project starting in 2012 and ending in 2015. It involved the participation of 24 National Metrology Institutes from Europe and Egypt, respectively. 38 gauge blocks of steel and ceramic with nominal central lengths between 0.5 mm and 500 mm were circulated. The comparison was conducted in two loops with two sets of artifacts. A statistical technique for linking the reference values was applied. As a consequence the reference value of one loop is influenced by the measurements of the other loop although they did not even see the artifacts of the others. This influence comes solely from three "linking laboratories" which measure both sets of artifacts. In total there were 44 results were not fully consistent with the reference values. This represents 10% of the full set of 420 results which is a considerable high number. At least 12 of them are clearly outliers where the participants have been informed by the pilot as soon as possible. The comparison results help to support the calibration and measurement capabilities (CMCs) of the laboratories involved in the CIPM MRA.

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-6931 (URN)10.1088/0026-1394/53/1A/04003 (DOI)2-s2.0-85014050950 (Scopus ID)30887 (Local ID)30887 (Archive number)30887 (OAI)
Note

To reach the main text of this paper, visit http://www.bipm.org/utils/common/pdf/final_reports/L/K1/EURAMET.L-K1.2011_Final_Report.pdf . Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. 

Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2023-06-08Bibliographically approved
Thalmann, R., Nicolet, A., Meli, F., Picotto, G. B., Matus, M., Carcedo, L., . . . Ramotowski, Z. (2016). Key comparison EURAMET.L-K8.2013 calibration of surface roughness standards (ed.). Metrologia, 53(1A)
Open this publication in new window or tab >>Key comparison EURAMET.L-K8.2013 calibration of surface roughness standards
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2016 (English)In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 53, no 1AArticle in journal (Refereed) Published
Abstract [en]

The key comparison EURAMET.L-K8.2013 on roughness was carried out in the framework of a EURAMET project starting in 2013 and ending in 2015. It involved the participation of 17 National Metrology Institutes from Europe, Asia, South America and Africa representing four regional metrology organisations. Five surface texture standards of different type were circulated and on each of the standards several roughness parameters according to the standard ISO 4287 had to be determined. 32 out of 395 individual results were not consistent with the reference value. After some corrective actions the number of inconsistent results could be reduced to 20, which correspond to about 5% of the total and can statistically be expected. In addition to the material standards, two softgauges were circulated, which allow to test the software of the instruments used in the comparison. The comparison results help to support the calibraton and measurement capabilities (CMCs) of the laboratories involved in the CIPM MRA.

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-6932 (URN)10.1088/0026-1394/53/1A/04001 (DOI)2-s2.0-85014017874 (Scopus ID)30888 (Local ID)30888 (Archive number)30888 (OAI)
Note

To reach the main text of this paper, visit http://www.bipm.org/utils/common/pdf/final_reports/L/K8/EURAMET.L-K8.2013_Final_Report.pdf . Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. 

Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2023-06-08Bibliographically approved
Appleby, G., Behrend, D., Bergstrand, S., Donovan, H., Emerson, C., Esper, J., . . . Wetzel, S. (2015). GGOS Requirements for Core Sites (ed.).
Open this publication in new window or tab >>GGOS Requirements for Core Sites
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2015 (English)Report (Refereed)
Abstract [en]

The Global Geodetic Observing System, an entity under the International Association of Geodesy (IAG) has undertaken the task of advocating for the geodetic infrastructure necessary to meet the global change and other societal challenges, and defining the requirements for the geodetic observatories that constitute it. In this role, GGOS will work with the IAG Measurement Services, the scientific Community, and national and international agencies to bring a combined effort to bear on these areas of international concern. A major task within this effort is the upgrading, expansion, and maintenance of the global ground network of co-located Core Sites for geodesy to enable the realization and maintenance of the International Terrestrial Reference Frame (ITRF), Earth orientation parameters and precision orbits to meet the needs of Earth orbiting missions, Earth Surface and interior programs, and deep space navigation. GGOS and the geodetic Core Sites should be compliant with the UN resolution from Feb 26, 2015. See http://www.unggrf.org/. This Site Requirements Document outlines what is needed for that compliance.

Publisher
p. 22
Series
GGOS Report
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-5657 (URN)29471 (Local ID)29471 (Archive number)29471 (OAI)
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2023-06-08Bibliographically approved
Bergstrand, S. & Saracoglu, E. (2014). Continuous monitoring of a long-span cable-stayed timber bridge (ed.). Journal of Civil Structural Health Monitoring, 5(2), 183-194
Open this publication in new window or tab >>Continuous monitoring of a long-span cable-stayed timber bridge
2014 (English)In: Journal of Civil Structural Health Monitoring, ISSN 2190-5452, Vol. 5, no 2, p. 183-194Article in journal (Refereed) Published
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-6687 (URN)10.1007/s13349-014-0088-1 (DOI)2-s2.0-84924971718 (Scopus ID)23677 (Local ID)23677 (Archive number)23677 (OAI)
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2023-06-08Bibliographically approved
Seppä, S. J., Korpelainen, V., Bergstrand, S., Karlsson, H., Lillepea, L. & Lassila, A. (2014). Intercomparison of lateral scales of scanning electron microscopes and atomic force microscopes in research institutes in Northern Europe (ed.). Measurement science and technology, 25(4), Article ID 44013.
Open this publication in new window or tab >>Intercomparison of lateral scales of scanning electron microscopes and atomic force microscopes in research institutes in Northern Europe
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2014 (English)In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 25, no 4, article id 44013Article in journal (Refereed) Published
Abstract [en]

An intercomparison of lateral scales of scanning electron microscopes (SEM) and atomic force microscopes (AFM) in various research laboratories in Northern Europe was organized by the local national metrology institutes. In this paper are presented the results of the comparison, with also an example uncertainty budget for AFM grating pitch measurement. Grating samples (1D) were circulated among the participating laboratories. The participating laboratories were also asked about the calibration of their instruments. The accuracy of the uncertainty estimates seemed to vary largely between the laboratories, and for some laboratories the appropriateness of the calibration procedures could be considered. Several institutes (60% of all results in terms of En value) also had good comprehension of their measurement capability. The average difference from reference value was 6.7 and 10.0 nm for calibrated instruments and 20.6 and 39.9 nm for uncalibrated instruments for 300 nm and 700 nm gratings, respectively. The correlation of the results for both nominally 300 and 700 nm gratings shows that a simple scale factor calibration would have corrected a large part of the deviations from the reference values.

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-6685 (URN)10.1088/0957-0233/25/4/044013 (DOI)2-s2.0-84896778155 (Scopus ID)23674 (Local ID)23674 (Archive number)23674 (OAI)
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2023-06-08Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-5203-5465

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