NASA GSFC VLBI quarterly solution
NASA Goddard Space Flight Center provides solutions using all
publicly accessible Very Long Baseline Interferometry (VLBI) data accumulated
since 1980.04.11
on a quarterly basis. The data used in these solutions are available
from the NASA Crustal Dynamics Data Information System
(CDDIS).
There are three types of solutions:
- Geodetic global solutions present estimates of stations
positions, station velocities, harmonic variations in site
positions, parameters of non-linear station motions, positions
of extragalactic radio sources, and the estimates of an
expansion of the Earth orientation parameters into harmonic
and B-spline bases from processing VLBI group delays derived
from processing all publicly available geodetic
experiments.
The results from NASA GSFC geodetic global VLBI solutions
are available here: gsf.
- Geodetic baseline solutions that present estimates
of baseline lengths between radio telescopes adjusted using least
squares in analysis of VLBI group delays derived during processing
all publicly available geodetic VLBI experiments
accumulated since 1980s till present. Baseline lengths are invariant
with respect to a group of rotations and translations, and therefore,
unlike to station positions, are determined uniquely from observations.
The results from NASA GSFC geodetic baseline VLBI solutions
are available here: bas.
- Astrometric solutions that present positions of compact radio
sources and estimates of other parameters adjusted in a single least
squares run using all available VLBI observations at 8.6 GHz and 2.2 GHz,
as well at 5 and 22 GHz from dedicated absolute astrometry programs and
routine geodetic experiments.
The results from NASA GSFC astrometric VLBI solutions are available here:
rfc.
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Last update: 2025.02.19_17:47:27
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