NASA Goddard Space Flight Center   Geodesy and Geophysics Laboratory

NASA GSFC baseline geodetic VLBI quarterly solutions

DOI: 10.25966/gadk-6y76

NASA Goddard Space Flight Center baseline geodetic Very Long Baseline Interferometry (VLBI) quarterly solutions provide estimates of baseline lengths between radio telescopes adjusted using least squares in analysis of group delays derived during processing all publicly available geodetic VLBI experiments accumulated since 1980.04.11 till present on a quarterly basis. The data used in these solutions are available from the NASA Crustal Dynamics Data Information System (CDDIS).

Baseline lengths are invariant with respect to a group of rotations and translations, and therefore, unlike to station positions, are determined uniquely from observations.

Results from two solutions are provided: total and residual.

In the total solution the baseline lengths and their uncertainties are provided without solving for neither station linear velocity, nor for their non-liner motion. These baseline lengths are a measure of relative motion of one station with respect to another.

In the residual solution the baseline lengths and their uncertainties are provided after applying the empirical station motion model derived in the NASA global geodetic VLBI solution 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.

The latest quarterly baseline VLBI geodetic solution: bas_2024d

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Last update: 2025.02.19_18:59:05 UTC