Steps towards phase delay VLBI.

Details Steps towards phase delay VLBI. Steps towards phase delay VLBI.

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999evga.conf..144p&link_type=abstract

13th Working Meeting on European VLBI for Geodesy and Astrometry, p. 144 - 151

Astronomy and Astrophysics

Astronomy

1

Scientific paper

One of the promising ways for improving precision of estimation of the targeted parameters of geodetic VLBI is to use phase delay measurements which are roughly 40-fold more precise than group delay observables. However phase delay ambiguities should be resolved before using these observables in LSQ adjustments. This problem is solved almost always for the case of relatively short baselines (1-10 km) where we are able to ignore an atmosphere contribution to time delay, but it is still a challenge for the case of longer baselines. A procedure for resolving phase delay ambiguity is presented. It exploits the fact that phase misclosures are usually a small fraction of phase ambiguity spacings. Phase delay measurements made in the network consisting of three or more stations provide some redundancy. It is shown that the proposed approach allows to resolve phase delay ambiguities for a subset of observations. Some results of phase delay solutions of EUROPE, IRIS-S and VLBA networks are presented. It was found that the success rate of phase delay ambiguity resolution for intercontinental baselines depends on the system sensitivity, the level of instrumental noise and the number of observations. Phase delay ambiguities can be resolved for up to 90% observations for the best, state-of-art VLBI experiments, although a success rate 40 - 70% is more typical.

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