Absolute methods for determination of reference system from VLBI observations.

Details Absolute methods for determination of reference system from VLBI observations. Absolute methods for determination of reference system from VLBI observations.

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999evga.conf..138p&link_type=abstract

13th Working Meeting on European VLBI for Geodesy and Astrometry, p. 138 - 143

Astronomy and Astrophysics

Astronomy

Scientific paper

There are two principal approaches to derivation of a reference system from various types of observations. Positions of stations and sources can be determined with respect to the reference frame taken as a fiducial one in differential approaches. Positions of a subset of some fiducial stations/sources which "hold" the system are fixed and are not estimated in the framework of this approach. The catalogues built by this way depend on the values of a priori positions of fiducial objects and therefore we call them "differential catalogues". However method of VLBI allows us to derive positions of all stations/sources from the observations up to a set of arbitrary constants. Since the reference system obtained by this way does not depend on the a priori catalogues it is called "absolute" reference system. Approaches for the development of such absolute catalogues of stations/sources using VLBI observations are discussed. Consequences on separation vertical component of station velocities from horizontal components are emphasized.

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