0 - Technical description of solution aus2011a.crf

 1 - Technique:   VLBI

 2 - Analysis Centre:
     Geoscience Australia

 3 - Software used:
     OCCAM 6.2

 4 - Data span:
     November, 1979 - September, 2010

 5 - Celestial Reference Frame: ICRF2

     a - Nature:

         extragalactic

     b - Definition of the orientation:  ICRF2

 6 - Terrestrial Reference Frame: itrf2000 and associated
                                  itrf2000 velocity field


     a - Relativity scale:

         Solar System Bary Center (SSB)

     b - Velocity of light:

         299792458 m/s

     c - Geogravitational constant:

         not applicable

     d - Permanent tidal correction:

         no

     e - Definition of the origin:

         NNT constraints on the daily basis for all
         VLBI stations

     f - Definition of the orientation:

         NNR constraints on the daily basis for all
         VLBI stations

     g - Reference epoch:

         1997.0

     h - Tectonic plate model:

         itrf2000 velocities used as apriori;
         exponential model for Gilcreek after the Denali, 2002
         earthquake [Titov, Tregoning; 2004]

     i - Constraints for time evolution:

         None

 7 - Earth orientation:

     a - A priori precession model:

         IERS 2003

     b - A priori nutation model:

         MHB2000

     c - Short-period tidal variations in x, y, UT1:

         Model used according to: R.Eanes (2000) as in IERS
         Conventions 2000


 8 - Estimated Parameters:

     a - Celestial Frame:

         - right ascension and declination of 2848 sources with
         4 and more observations (group delays) as global parameters
         - daily coordinates of 39 unstable ICRF2 
           sources as 'arc' parameters


     b - Terrestrial Frame:

         Daily  x, y, z values for all sites
         with further estimation of (x0,y0,z0) referred to
         1997.0 and corresponding velocities

     c - Earth Orientation:

         xp, yp, UT1-UTC, dpsi, deps

     d - Others:

         - clock offsets, rates and 2nd derivatives;
         - wet zenith tropospheric delays;
         - wet troposphere gradients.

         Clock offsets, wet delays and gradients and EOP were
         considered as stochastic parameters with relevant
         covariance functions. VMF1 mapping function [Boehm,
         Schuh; 2004] has been applied for the troposphere
         modeling

    References:

Boehm J., H.Schuh, Vienna Mapping functions in VLBI analysis,
Geoph. Res. Lett., 31 L01603 DOI10.129/2003GL018984, 2004.
Eanes R., private communication, 2000.
Ma, C., et al., The International Celestial Reference
Frame as realized by Very Long Baseline Interferometry, AJ, 116,
516-546, 1998.
Titov O., P. Tregoning, Post-Seismic Motion of Gilcreek Geodetic
Sites Following the November, 2002 Denali Earthquake, in
International VLBI Service for Geodesy and Astrometry 2004
General Meeting Proceedings, edited by Nancy R. Vandenberg and
Karen D. Baver, NASA/CP-2004-212255, 2004.