Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Shrishail Raut
  • Robert Heinkelmann
  • Sadegh Modiri
  • Santiago Belda
  • Kyriakos Balidakis
  • Harald Schuh
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Details

Original languageEnglish
Article number2740
JournalSensors
Volume22
Issue number7
Publication statusPublished - 2 Apr 2022
Externally publishedYes

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.

Keywords

    UT1-UTC, VLBI, CONT17, VGOS, Intensive session

ASJC Scopus subject areas

Cite this

Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17. / Raut, Shrishail; Heinkelmann, Robert; Modiri, Sadegh et al.
In: Sensors, Vol. 22, No. 7, 2740, 02.04.2022.

Research output: Contribution to journalArticleResearchpeer review

Raut, S, Heinkelmann, R, Modiri, S, Belda, S, Balidakis, K & Schuh, H 2022, 'Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17', Sensors, vol. 22, no. 7, 2740. https://doi.org/10.3390/s22072740
Raut, S., Heinkelmann, R., Modiri, S., Belda, S., Balidakis, K., & Schuh, H. (2022). Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17. Sensors, 22(7), Article 2740. https://doi.org/10.3390/s22072740
Raut S, Heinkelmann R, Modiri S, Belda S, Balidakis K, Schuh H. Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17. Sensors. 2022 Apr 2;22(7):2740. doi: 10.3390/s22072740
Raut, Shrishail ; Heinkelmann, Robert ; Modiri, Sadegh et al. / Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17. In: Sensors. 2022 ; Vol. 22, No. 7.
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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.",
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