<div class="csl-bib-body">
<div class="csl-entry">Kern, L. M., Schartner, M., Böhm, J., Böhm, S., Nothnagel, A. G., & Soja, B. (2022). The importance of accurate a priori information for VLBI Intensive sessions. In <i>IAG International Symposium on Reference Frames for Applications in Geosciences (REFAG 2022). Book of Abstracts</i> (pp. 73–73). International Association of Geodesy. https://doi.org/10.34726/3183</div>
</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/139223
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dc.identifier.uri
https://doi.org/10.34726/3183
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dc.description.abstract
So-called Intensive sessions, also referred to as Intensives, are routinely observed one-hour sessions with two to three stations with the primary goal of deriving the Earth's phase of rotation with low latency. Due to the highly restricted number of observations, only a few parameters of interest can be estimated, including zenith wet delays per station, clock offsets, as well as the parameter of main interest, the difference between Universal Time (UT1) and Coordinated Universal Time (UTC). Thus, the remaining EOP, namely polar motion and nutation, and the station coordinates are fixed to their a priori value making the precision of the UT1-UTC estimates strongly dependent on their accuracy. In this study, the impact of realistic errors in the a priori information of polar motion, nutation, and station coordinates (in north-south, east-west or up-down direction) on the UT1-UTC estimate of Intensive sessions are investigated by applying rigorous simulations. To get a global picture, we generated a 10x10 degree grid of artificial VLBI antennas and scheduled and simulated over 240000 Intensive sessions where different errors were introduced in the simulation process. We find that in contrast to errors in the north-south or east-west components of the station coordinates, an error in the station height only slightly affects the UT1-UTC determination. In general, equatorial baselines are very sensitive to any a priori error, as are baselines with a midpoint close to the equatorial plane as well as very long ones. On the other hand, long east-west oriented baselines that enclose a small angle with the equatorial plane seem to be most resistant against errors in the a priori values. This study shows that the contributions from erroneous a priori information, in general, are not negligible and need to be accounted for when investigating the accuracy of the UT1-UTC estimates from Intensive sessions.
en
dc.language.iso
en
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dc.rights.uri
http://rightsstatements.org/vocab/InC/1.0/
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dc.subject
VLBI
en
dc.subject
Intensive sessions
en
dc.subject
UT1-UTC
en
dc.title
The importance of accurate a priori information for VLBI Intensive sessions
en
dc.type
Inproceedings
en
dc.type
Konferenzbeitrag
de
dc.rights.license
Urheberrechtsschutz
de
dc.rights.license
In Copyright
en
dc.identifier.doi
10.34726/3183
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dc.contributor.affiliation
ETH Zurich, Switzerland
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dc.contributor.affiliation
ETH Zurich, Switzerland
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dc.description.startpage
73
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dc.description.endpage
73
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dc.type.category
Abstract Book Contribution
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tuw.booktitle
IAG International Symposium on Reference Frames for Applications in Geosciences (REFAG 2022). Book of Abstracts
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tuw.relation.publisher
International Association of Geodesy
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tuw.researchTopic.id
X1
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tuw.researchTopic.id
C6
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tuw.researchTopic.name
Beyond TUW-research foci
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tuw.researchTopic.name
Modeling and Simulation
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tuw.researchTopic.value
50
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tuw.researchTopic.value
50
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tuw.publication.orgunit
E120-04 - Forschungsbereich Höhere Geodäsie
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dc.identifier.libraryid
AC17202397
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dc.description.numberOfPages
1
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tuw.author.orcid
0000-0002-2065-9705
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tuw.author.orcid
0000-0001-5855-7280
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tuw.author.orcid
0000-0002-1208-5473
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tuw.author.orcid
0000-0002-9815-183X
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tuw.author.orcid
0000-0002-7010-2147
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dc.rights.identifier
Urheberrechtsschutz
de
dc.rights.identifier
In Copyright
en
tuw.event.name
IAG International Symposium on Reference Frames for Application in Geosciences (REFAG 2022)
en
tuw.event.startdate
17-10-2022
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tuw.event.enddate
20-10-2022
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tuw.event.online
On Site
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tuw.event.type
Event for scientific audience
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tuw.event.place
Thessaloniki
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tuw.event.country
GR
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tuw.event.presenter
Kern, Lisa Maria
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wb.sciencebranch
Geodäsie, Vermessungswesen
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wb.sciencebranch
Informatik
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wb.sciencebranch
Physische Geographie
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wb.sciencebranch.oefos
2074
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wb.sciencebranch.oefos
1020
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wb.sciencebranch.oefos
1054
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wb.sciencebranch.value
70
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wb.sciencebranch.value
15
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wb.sciencebranch.value
15
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item.languageiso639-1
en
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item.openairetype
conference paper
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item.grantfulltext
open
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item.fulltext
with Fulltext
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item.cerifentitytype
Publications
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item.mimetype
application/pdf
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item.openairecristype
http://purl.org/coar/resource_type/c_5794
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item.openaccessfulltext
Open Access
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crisitem.author.dept
E120-04 - Forschungsbereich Höhere Geodäsie
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crisitem.author.dept
E120-04 - Forschungsbereich Höhere Geodäsie
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crisitem.author.dept
E120 - Department für Geodäsie und Geoinformation
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crisitem.author.dept
E120-04 - Forschungsbereich Höhere Geodäsie
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crisitem.author.dept
E120-04 - Forschungsbereich Höhere Geodäsie
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crisitem.author.dept
E101 - Institut für Analysis und Scientific Computing