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Further development of VLBI techniques will allow more accurate measurements of such deflections in the future.
The European VLBI network is a collaboration of radio astronomy institutes around Europe, China and South Africa, and sponsored by the respective national research bodies.
There is still plenty of ground-based VLBI to do, however, particularly in the shortest-wave range of radio, the millimeter-wave range.
And NASA is helping to lead the development of the next generation of VLBI system through the agency's Space Geodesy Project, led by Goddard.
Now two scientists argue that measurements indicate that VLBI stations at Westford, Mass.
In order to achieve this aim, all the stations that contribute to the project must have all the geodetic techniques; VLBI, SLR, GNSS and DORIS and absolute and super leading gravimetre.
The result was radio silence - but the team used their experience to validate VLBI as a technique particularly suited to this kind of targeted search.
In this direction, Japanese VLBI Network (JVN) which incorporates the VLBI exploration of radio astrometry (VERA) array has made some significant contributions.
With VLBI, the more exact of the two techniques, scientists are on their way to being able to measure distances with a precision comparable to measuring the length of 100 football fields to within a human hair.
But with the vector tie system, which will use a laser to continuously monitor the reference points of each technique, researchers will know exactly where a station's GPS, VLBI, SLR and DORIS sit relative to each other at all times, allowing them to better correct one of the last sources of error in the terrestrial reference frame.
Furthermore, it was agreed that MeerKAT would be furnished with a VLBI capability and be used with the world arrays for the highest resolution measurements in astronomy.
The errors of other methods currently in use range from about 3 to 10 times greater than those of SLR and VLBI.
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