2019
DOI: 10.1007/s00190-019-01302-5
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Gravitational deformation of ring-focus antennas for VGOS: first investigations at the Onsala twin telescopes project

Abstract: The receiving properties of radio telescopes used in geodetic and astrometric very long baseline interferometry (VLBI) depend on the surface quality and stability of the main reflector. Deformations of the main reflector as well as changes in the sub-reflector position affect the geometrical ray path length significantly. The deformation pattern and its impact on the VLBI results of conventional radio telescopes have been studied by several research groups using holography, laser tracker, close-range photogram… Show more

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Cited by 14 publications
(19 citation statements)
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“… 2019 ; Lösler et al. 2019 ) deformation of radio telescopes, which has a significant impact on the local-tie vectors (see Sect. 5.5.4 ).…”
Section: Geodetic Data Analysismentioning
confidence: 99%
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“… 2019 ; Lösler et al. 2019 ) deformation of radio telescopes, which has a significant impact on the local-tie vectors (see Sect. 5.5.4 ).…”
Section: Geodetic Data Analysismentioning
confidence: 99%
“… 2019 ; Lösler et al. 2019 ) in the data analysis Antenna (mm) (mm) (mm) (a) OE OW (b) OE OW Presented are the corresponding changes in the weighted mean topocentric positions of OE and OW when either (a) the gravitational deformation model for ON is used or is not used, and (b) when the gravitational deformation model for OE and OW is used or is not used …”
Section: Geodetic Data Analysismentioning
confidence: 99%
See 1 more Smart Citation
“…By convention, this reference point is defined by the orthogonal projection of the elevation axis onto the azimuth axis [12]. Since close range photogrammetry has been verified to be a suitable method to detect changes of the reflector geometries of VLBI radio telescopes with submillimeter accuracy [13][14][15], close range photogrammetry is transferred to the ILRS reference point determination of an SLR telescope, in this contribution. To the best of our knowledge, this is the first time close range photogrammetry has been used to determine the ILRS reference point.…”
Section: Introductionmentioning
confidence: 99%
“…Indeed, their performances highly depend on the relative alignment between their components. Lastly, LVM can also be applied over radio telescopes used in geodetic and astrometric very-long-baseline interferometry (VLBI) for monitoring of their spatial position and for estimation of their geometrical reference point [5,6]. In this case, a positioning accuracy better than 1 mm is anticipated in the coming years.…”
Section: Introductionmentioning
confidence: 99%