NASA GSFC baseline VLBI solution bas_2024d


DOI: 10.25966/gadk-6y76

NASA Goddard Space Flight Center baseline VLBI solution bas_2024d provides estimates of baseline lengths from processing all publicly accessible Very Long Baseline Interferometry (VLBI) group delays derived from processing all available geodetic VLBI observations since 1980.04.11 through 2024.12.03 , in total, 19,535,536 group delays from 7995 experiments. This resources provides results from two solutions: total and residual.

In the total solution the total baseline lengths and their uncertainties are provided without solving for neither station linear velocity, no for the non-liner motion. These baseline lengths are a measure of relative motion of one station with respect to another. Baseline lengths are invariant with respect to a group of rotations and translations, and therefore, unlike to station positions are determined uniquely from observations.

In the residual solution the residual baseline lengths and their uncertainties are provided after applying the empirical station motion derived in the global VLBI solution gsf_2024d in a form of a sum of station linear velocity, harmonic site position variations and non-linear motion in a form of an expansion over the B-spline basis.

Methods of data analysis are described in full detail in Petrov & Kovalev, "The Radio Fundamental Catalog", 2025, The Astrophysical Journal Supplement Series, 276:38 (51pp), doi: 10.3847/1538-4365/ad8c36.

Geophysics Results

  Baseline length time series

Lengths of 2705 baselines were estimated for each baseline separately.

Total baseline lengths Format description
Residual baseline lengths Format description

  Adjustments to path delays in the neutral atmosphere

Adjustments to path delays in the neutral atmosphere bas_2024d.trp Format description
Statistics of the atmospheric parameters bas_2024d.trs   

Statistics

Wrms of post-fit residuals for each session Format description

  Statistics of observing campaigns

  Miscellaneous

Listing of the total baseline solution.  
Listing of the residual baseline solution.  
Control file for the total baseline solution. Description of Solve batch control language
Control file for the residual baseline solution. Description of Solve batch control language
Control file for VLBI Time Delay computation for the total solution Description of VTD control language
Control file for VLBI Time Delay computation for the residual solution Description of VTD control language

  Acknowledgments

We acknowledge staff at VLBI observing stations, VLBI correlators, and VLBI data centers listed here for their support of VLBI operations.

Back NASA GSFC baseline geodetic VLBI quarterly solutions


Web page was prepared by Leonid Petrov ()
Last update: 2025.02.19_13:58:46