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Baseline-dependent clock offsets in VLBI data analysis.

Hana Krásná1,2, Frédéric Jaron1, Jakob Gruber1

  • 1Department of Geodesy and Geoinformation, Technische Universität Wien (TU Wien), Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.

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|November 18, 2021
PubMed
Summary
This summary is machine-generated.

Baseline-dependent clock offsets (BCOs) are crucial for accurate geodetic Very Long Baseline Interferometry (VLBI) analyses. Missing S-band channels, impacting ionospheric calibration, are the primary cause of significant BCOs in VLBI data.

Keywords:
Baseline-dependent clock offsetsCONT17IVSVLBI

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Area of Science:

  • Geodesy
  • Radio Astronomy
  • Earth Science

Background:

  • Geodetic Very Long Baseline Interferometry (VLBI) establishes precise reference frames and Earth orientation parameters.
  • VLBI analysis requires estimating atomic clock offsets and variations.
  • Observed group delays often exhibit baseline-specific offsets, necessitating baseline-dependent clock offsets (BCOs) estimation.

Purpose of the Study:

  • To systematically investigate the impact and importance of BCOs in VLBI data analysis.
  • To analyze the influence of BCOs on geodetic parameters like station coordinates and Earth orientation.
  • To explore theoretical aspects of BCO determination and their relation to network clock strategies.

Main Methods:

  • Analysis of data from legacy networks of the CONT17 campaign.
  • Systematic investigation of BCOs' impact on geodetic parameter estimation.
  • Theoretical examination of BCOs, including reference clock effects and triangle delay closures.

Main Results:

  • BCOs significantly impact geodetic parameter estimates.
  • The choice of reference clock in the observing network affects BCO estimates.
  • A relationship exists between BCOs and triangle delay closures.

Conclusions:

  • Missing S-band channels, critical for ionospheric delay calibration, are the dominant cause of significant BCOs.
  • Understanding and estimating BCOs is essential for high-accuracy VLBI applications.
  • Addressing channel deficiencies can mitigate BCOs and improve geodetic results.