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A gravitational telescope deformation model for geodetic VLBI
RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.ORCID iD: 0000-0001-5203-5465
RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.ORCID iD: 0000-0003-1710-6058
RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
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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.

Place, publisher, year, edition, pages
2019. Vol. 93, no 5, p. 669-680
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Natural Sciences
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URN: urn:nbn:se:ri:diva-36562DOI: 10.1007/s00190-018-1188-1Scopus ID: 2-s2.0-85053236319OAI: oai:DiVA.org:ri-36562DiVA, id: diva2:1268562
Available from: 2018-12-06 Created: 2018-12-06 Last updated: 2019-06-28Bibliographically approved

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Bergstrand, StenRieck, Carsten

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