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Main Title: Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17
Author(s): Raut, Shrishail
Heinkelmann, Robert
Modiri, Sadegh
Belda, Santiago
Balidakis, Kyriakos
Schuh, Harald
Type: Article
Abstract: This work focuses on the assessment of UT1-UTC estimates from various types of sessions during the CONT17 campaign. We chose the CONT17 campaign as it provides 15 days of continuous, high-quality VLBI data from two legacy networks (S/X band), i.e., Legacy-1 (IVS) and Legacy-2 (VLBA) (having different network geometry and are non-overlapping), two types of Intensive sessions, i.e., IVS and Russian Intensives, and five days of new-generation, broadband VGOS sessions. This work also investigates different approaches to optimally compare dUT1 from Intensives with respect to the 24 h sessions given the different parameterization adopted for analyzing Intensives and different session lengths. One approach includes the estimation of dUT1 from pseudo Intensives, which are created from the 24 h sessions having their epochs synchronized with respect to the Intensive sessions. Besides, we assessed the quality of the dUT1 estimated from VGOS sessions at daily and sub-daily resolution. The study suggests that a different approach should be adopted when comparing the dUT1 from the Intensives, i.e., comparison of dUT1 value at the mean epoch of an Intensive session. The initial results regarding the VGOS sessions show that the dUT1 estimated from VGOS shows good agreement with the legacy network despite featuring fewer observations and stations. In the case of sub-daily dUT1 from VGOS sessions, we found that estimating dUT1 with 6 h resolution is superior to other sub-daily resolutions. Moreover, we introduced a new concept of sub-daily dUT1-tie to improve the estimation of dUT1 from the Intensive sessions. We observed an improvement of up to 20% with respect to the dUT1 from the 24 h sessions.
Subject(s): UT1-UTC
intensive session
Issue Date: 2-Apr-2022
Date Available: 10-May-2022
Language Code: en
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Sponsor/Funder: DFG, 491075472, Open-Access-Publikationskosten / 2022-2024 / Deutsches GeoForschungsZentrum GFZ / Potsdam-Institut für Klimafolgenforschung (PIK)
DFG, 434617780, SFB 1464: Relativistische und quanten-basierte Geodäsie (TerraQ)
Journal Title: Sensors
Publisher: MDPI
Volume: 22
Issue: 7
Article Number: 2740
Publisher DOI: 10.3390/s22072740
EISSN: 1424-8220
TU Affiliation(s): Fak. 6 Planen Bauen Umwelt » Inst. Geodäsie und Geoinformationstechnik » FG Satellitengeodäsie
Appears in Collections:Technische Universität Berlin » Publications

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