Validation of GNSS-based reference point monitoring of the VGOS VLBI telescope at Metsähovi

[EN] VLBI telescope reference point, the closest point in the telescope primary axis from the secondary axis, is typically determined indirectly by observation of points co-rotating with the telescope. We have previously measured telescope reference point indirectly with two GPS-antennas attached on...

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Autores: Kallio, Ulla, Eskelinen, Joona, Jokela, Jorma, Koivula, Hannu, Marila, Simo, Näränen, Jyri, Poutanen, Markku, Raja-Halli, Arttu, Rouhiainen, Paavo, Suurmäki, Heli
Tipo de recurso: capítulo de libro
Fecha de publicación:2023
País:España
Institución:Universitat Politècnica de València (UPV)
Repositorio:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
Idioma:inglés
OAI Identifier:oai:riunet.upv.es:10251/191656
Acceso en línea:https://riunet.upv.es/handle/10251/191656
Access Level:acceso abierto
Palabra clave:VGOS antenna
Sistema Global de Navegación por Satélite (GNSS)
Radio telescope
Reference point
Monitoring techniques
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spelling Validation of GNSS-based reference point monitoring of the VGOS VLBI telescope at MetsähoviKallio, UllaEskelinen, JoonaJokela, JormaKoivula, HannuMarila, SimoNäränen, JyriPoutanen, MarkkuRaja-Halli, ArttuRouhiainen, PaavoSuurmäki, HeliVGOS antennaSistema Global de Navegación por Satélite (GNSS)Radio telescopeReference pointMonitoring techniques[EN] VLBI telescope reference point, the closest point in the telescope primary axis from the secondary axis, is typically determined indirectly by observation of points co-rotating with the telescope. We have previously measured telescope reference point indirectly with two GPS-antennas attached on the edge of the dish of the Aalto University Metsähovi radio telescope in 2008-2015. Now we have applied the same technique to the new VGOS-telescope of the FGI Metsähovi geodetic research station. The reference point of the VGOS antenna was estimated using post-processed trajectory coordinates of two GNSS antennas. The antennas are attached on the edge of the radio telescope dish with gimbals where a counterweight with shock absorber act as compensators to ensure zenith pointing at all telescope elevation angles. In addition, spherical prisms are attached to the structure of the telescope for tachymetric reference point determination. One purpose of this study is to evaluate the limit values and uncertainties of the compensator assembly by simulations and precise tachymeter measurements. To ensure that the compensation error is nearly constant or can be modelled, we have measured the residual tilt of the GNSS antennas with different VLBI antenna elevations. The results indicate a need to apply the corrections or to improve the compensator design. We aim to improve the counterweight and dampening so that no extra model corrections to trajectory coordinates are needed. For final assurance of our GNSS-based reference point monitoring performance, we have compared the reference point coordinates determined by simultaneous tachymetric and GNSS data. Our results and simulations showed that, with a small compensation error, the influence on reference point coordinates is marginal but the axis offset will be compromised, provided that the compensating angle bias is nearly constant.  Preliminary reference point estimates show a rather good agreement of simultaneous GNSS-based and tachymetric reference points. The final results will be achieved as part of the 18SIB01 EMPIR GeoMetre project, funded from the EMPIR programme and co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation programme.Editorial Universitat Politècnica de ValènciaEuropean CommissionAcademy of FinlandRepositorio Institucional de la Universitat Politècnica de València Riunet20232023-01-27book parthttp://purl.org/coar/resource_type/c_3248VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/bookPartapplication/pdfhttps://riunet.upv.es/handle/10251/191656reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valénciainstname:Universitat Politècnica de València (UPV)InglésengEuropean Commission https://doi.org/10.13039/501100000780 H2020 18SIB01open accesshttp://purl.org/coar/access_right/c_abf2Reconocimiento - No comercial - Compartir igual (by-nc-sa) http://creativecommons.org/licenses/by-nc-sa/4.0/info:eu-repo/semantics/openAccessoai:riunet.upv.es:10251/1916562026-06-13T07:49:27Z
dc.title.none.fl_str_mv Validation of GNSS-based reference point monitoring of the VGOS VLBI telescope at Metsähovi
title Validation of GNSS-based reference point monitoring of the VGOS VLBI telescope at Metsähovi
spellingShingle Validation of GNSS-based reference point monitoring of the VGOS VLBI telescope at Metsähovi
Kallio, Ulla
VGOS antenna
Sistema Global de Navegación por Satélite (GNSS)
Radio telescope
Reference point
Monitoring techniques
title_short Validation of GNSS-based reference point monitoring of the VGOS VLBI telescope at Metsähovi
title_full Validation of GNSS-based reference point monitoring of the VGOS VLBI telescope at Metsähovi
title_fullStr Validation of GNSS-based reference point monitoring of the VGOS VLBI telescope at Metsähovi
title_full_unstemmed Validation of GNSS-based reference point monitoring of the VGOS VLBI telescope at Metsähovi
title_sort Validation of GNSS-based reference point monitoring of the VGOS VLBI telescope at Metsähovi
dc.creator.none.fl_str_mv Kallio, Ulla
Eskelinen, Joona
Jokela, Jorma
Koivula, Hannu
Marila, Simo
Näränen, Jyri
Poutanen, Markku
Raja-Halli, Arttu
Rouhiainen, Paavo
Suurmäki, Heli
author Kallio, Ulla
author_facet Kallio, Ulla
Eskelinen, Joona
Jokela, Jorma
Koivula, Hannu
Marila, Simo
Näränen, Jyri
Poutanen, Markku
Raja-Halli, Arttu
Rouhiainen, Paavo
Suurmäki, Heli
author_role author
author2 Eskelinen, Joona
Jokela, Jorma
Koivula, Hannu
Marila, Simo
Näränen, Jyri
Poutanen, Markku
Raja-Halli, Arttu
Rouhiainen, Paavo
Suurmäki, Heli
author2_role author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv European Commission
Academy of Finland
Repositorio Institucional de la Universitat Politècnica de València Riunet
dc.subject.none.fl_str_mv VGOS antenna
Sistema Global de Navegación por Satélite (GNSS)
Radio telescope
Reference point
Monitoring techniques
topic VGOS antenna
Sistema Global de Navegación por Satélite (GNSS)
Radio telescope
Reference point
Monitoring techniques
description [EN] VLBI telescope reference point, the closest point in the telescope primary axis from the secondary axis, is typically determined indirectly by observation of points co-rotating with the telescope. We have previously measured telescope reference point indirectly with two GPS-antennas attached on the edge of the dish of the Aalto University Metsähovi radio telescope in 2008-2015. Now we have applied the same technique to the new VGOS-telescope of the FGI Metsähovi geodetic research station. The reference point of the VGOS antenna was estimated using post-processed trajectory coordinates of two GNSS antennas. The antennas are attached on the edge of the radio telescope dish with gimbals where a counterweight with shock absorber act as compensators to ensure zenith pointing at all telescope elevation angles. In addition, spherical prisms are attached to the structure of the telescope for tachymetric reference point determination. One purpose of this study is to evaluate the limit values and uncertainties of the compensator assembly by simulations and precise tachymeter measurements. To ensure that the compensation error is nearly constant or can be modelled, we have measured the residual tilt of the GNSS antennas with different VLBI antenna elevations. The results indicate a need to apply the corrections or to improve the compensator design. We aim to improve the counterweight and dampening so that no extra model corrections to trajectory coordinates are needed. For final assurance of our GNSS-based reference point monitoring performance, we have compared the reference point coordinates determined by simultaneous tachymetric and GNSS data. Our results and simulations showed that, with a small compensation error, the influence on reference point coordinates is marginal but the axis offset will be compromised, provided that the compensating angle bias is nearly constant.  Preliminary reference point estimates show a rather good agreement of simultaneous GNSS-based and tachymetric reference points. The final results will be achieved as part of the 18SIB01 EMPIR GeoMetre project, funded from the EMPIR programme and co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation programme.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023-01-27
dc.type.none.fl_str_mv book part
http://purl.org/coar/resource_type/c_3248
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/bookPart
format bookPart
dc.identifier.none.fl_str_mv https://riunet.upv.es/handle/10251/191656
url https://riunet.upv.es/handle/10251/191656
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv European Commission https://doi.org/10.13039/501100000780 H2020 18SIB01
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Reconocimiento - No comercial - Compartir igual (by-nc-sa)
http://creativecommons.org/licenses/by-nc-sa/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Reconocimiento - No comercial - Compartir igual (by-nc-sa)
http://creativecommons.org/licenses/by-nc-sa/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Editorial Universitat Politècnica de València
publisher.none.fl_str_mv Editorial Universitat Politècnica de València
dc.source.none.fl_str_mv reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
instname:Universitat Politècnica de València (UPV)
instname_str Universitat Politècnica de València (UPV)
reponame_str RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
collection RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869418899474219008
score 15,301603

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