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GNSS zenith delays and gradients in the analysis of VLBI Intensive sessions

Teke, Kamil and Böhm, Johannes and Madzak, Matthias and Younghee, Kwak and Steigenberger, Peter (2015) GNSS zenith delays and gradients in the analysis of VLBI Intensive sessions. Advances in Space Research, 56 (8), pp. 1667-1676. Elsevier. DOI: 10.1016/j.asr.2015.07.032 ISSN 0273-1177

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Very Long Baseline Interferometry (VLBI) is the only space geodetic technique which is capable of estimating Universal Time (UT1 = UTC + ΔUT1). So-called VLBI Intensive sessions of the International VLBI Service for Geodesy and Astrometry (IVS) are dedicated to the rapid production of ΔUT1. However, the accuracy achieved with those sessions is still below what could be expected from formal uncertainties of the estimates and one of the reasons is the inappropriate modeling of azimuthal asymmetries of the troposphere delays, because usually no gradients are modeled or estimated. To overcome that deficiency, we introduced troposphere zenith delays and horizontal total gradients estimated from the observations of Global Navigation Satellite Systems (GNSS) i.e. the solution of the Center for Orbit Determination in Europe (CODE) in the analysis of VLBI Intensive sessions carried out from the beginning of 2008 till the end of 2014. We compared our results with the GNSS-derived length-of-day (LOD) estimates of CODE and the International GNSS Service (IGS) and find slight improvements of agreement by up to 1 μs for both INT1 and INT2 sessions with gradients from CODE. We do not see any additional significant improvement of LOD agreement when GNSS zenith delays are introduced.

Item URL in elib:https://elib.dlr.de/98026/
Document Type:Article
Title:GNSS zenith delays and gradients in the analysis of VLBI Intensive sessions
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Teke, KamilHacettepe University, Ankara, TurkeyUNSPECIFIED
Böhm, JohannesVienna University of Technology, Vienna, Austriahttps://orcid.org/0000-0002-1208-5473
Madzak, MatthiasVienna University of Technology, Vienna, AustriaUNSPECIFIED
Younghee, KwakVienna University of Technology, Vienna, AustriaUNSPECIFIED
Steigenberger, PeterDLR/GSOChttps://orcid.org/0000-0003-1905-6699
Date:31 July 2015
Journal or Publication Title:Advances in Space Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.asr.2015.07.032
Page Range:pp. 1667-1676
Keywords:VLBI; Intensive sessions; Universal Time 1; Length of day; Troposphere gradients from GNSS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben Infrastruktur und Unterstützung für Raumflugbetrieb
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training
Deposited By: Steigenberger, Peter
Deposited On:02 Sep 2015 13:02
Last Modified:06 Sep 2019 15:27

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