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

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Summary

This study compares UT1-UTC estimates from VLBI data during the CONT17 campaign. New VGOS sessions show good agreement with legacy networks, and a novel dUT1-tie method improves intensive session estimates by up to 20%.

Keywords:
CONT17Intensive sessionUT1-UTCVGOSVLBI

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Area of Science:

  • Geodesy
  • Astronomy
  • Earth Science

Background:

  • Accurate estimation of Earth's rotation parameters, specifically UT1-UTC, is crucial for precise space geodesy.
  • The CONT17 campaign provided a unique dataset combining legacy Very Long Baseline Interferometry (VLBI) networks and new-generation VGOS observations.
  • Comparing dUT1 estimates from different session types (24h, Intensive, VGOS) requires careful consideration of parameterization and session length.

Purpose of the Study:

  • To assess and compare UT1-UTC estimates derived from various VLBI session types within the CONT17 campaign.
  • To investigate optimal methods for comparing dUT1 values obtained from Intensive sessions with those from 24h sessions.
  • To evaluate the quality and resolution of dUT1 estimates from new-generation VGOS sessions.

Main Methods:

  • Analysis of CONT17 VLBI data from legacy S/X band networks (Legacy-1, Legacy-2) and broadband VGOS sessions.
  • Development and application of pseudo-Intensive sessions derived from 24h sessions for comparative analysis.
  • Assessment of daily and sub-daily dUT1 estimates from VGOS, including a 6-hour resolution analysis.
  • Introduction of a sub-daily dUT1-tie concept to enhance Intensive session dUT1 estimation.

Main Results:

  • VGOS-derived dUT1 estimates demonstrate good agreement with legacy network results, despite fewer observations and stations.
  • Comparing dUT1 from Intensive sessions necessitates specific approaches, such as comparing values at the mean epoch.
  • Sub-daily dUT1 estimation from VGOS sessions benefits from a 6-hour resolution.
  • The novel sub-daily dUT1-tie method improved Intensive session dUT1 estimates by up to 20% compared to 24h sessions.

Conclusions:

  • A distinct methodology is recommended for comparing dUT1 from Intensive sessions.
  • New-generation VGOS VLBI technology shows promise for accurate UT1-UTC determination.
  • The sub-daily dUT1-tie concept offers a significant improvement for Intensive session analysis, enhancing Earth rotation monitoring.