0 - Technical description of solution aus2012b.crf

 1 - Technique:   VLBI

 2 - Analysis Centre:
     Geoscience Australia

 3 - Software used:
     OCCAM 6.2

 4 - Data span:
     November, 1979 - September, 2013
     5,927,370 group delays 
     Weighted rms is 14.2 pks


 5 - Celestial Reference Frame: ICRF2

     a - Nature:

         extragalactic

     b - Definition of the orientation:  ICRF2

 6 - Terrestrial Reference Frame: itrf2008 and associated
                                  itrf2008 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, except Tigoconc, Yarra12M, Kath12M,
         Metsahov, DSS65A, Parkes and Tsukub32 after the 2011 earthquake

     f - Definition of the orientation:

         NNR constraints on the daily basis for all
         VLBI stations, except Tigoconc, Yarra12M, Kath12M,
         Metsahov, DSS65A, Parkes and Tsukub32 after the 2011 earthquake

     g - Reference epoch:

         2005.0

     h - Tectonic plate model:

         itrf2008 velocities used as apriori;
         exponential model for Gilcreek after the Denali, 2002
         earthquake [Titov, Tregoning; 2004]

     i - Constraints for time evolution:

         None

 Positions and velocities used for Australian and New Zealand stations as below

TC HOBART12   -3949990.1702   2522421.0888  -4311708.6940  AZEL    .00000  7240
TV HOBART12  -.0389    .0085    .0403
TC KATH12M    -4147354.010    4581542.22    -1573303.93    AZEL    .00000  7375
TV KATH12M   -.0389    .0085    .0403
TC YARRA12M   -2388895.801    5043349.334   -3078591.628   AZEL   0.00000  7238
TV YARRA12M  -.0200    .0430    .0480
TC WARK12M    -5115324.46      477843.25    -3767192.86    AZEL    .00000  7377
TV WARK12M    .0000    .0000    .0000

 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 2949 sources with three
           and more observations (group delays) as global parameters;
           NNR constraint was imposed on 295 ICRF2 defining sources.
         - 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
         2005.0 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.