Technical description of solution GAOUA 03 R 01

 1 - Technique:   	VLBI

 2 - Analysis Centre:	Main Astronomical Observatory, 
			National Academy of Sciences of Ukraine,
			Kiev, Ukraine
 3 - Software used:	SteelBreeze-2.0.2
     
 4 - Data span:		Aug 1979 -- Sep 2003

 5 - Celestial Reference Frame: 
			RSC(GAOUA)03 R 01

     a - Nature:	extragalactic

     b - Definition of the orientation:
    			No Net Source Rotation of Position Constraints,
			[Gipson, 1998] were applied to 23 defining 
			radiosources to tie their positions to initial 
			coordinates of ICRF-Ext1 catalogue.

 6 - Terrestrial Reference Frame: 
			SSC(GAOUA)03 R 01
			SSV(GAOUA)03 R 01

     a - Relativity scale:
    			SSB

     b - Velocity of light:
        		299792458 m/s

     c - Geogravitational constant:
			not applicable

     d - Permanent tidal correction:
        		no  
         
     e - Definition of the origin:
			No Net Translation Position Constraints [Gipson, 1998]
			were applied to 8 stations (ONSALA60, WETTZELL
			HARTRAO, ALGOPARK, KOKEE, WESTFORD, FORTLEZA
			and HOBART26) to tie their positions to initial 
			coordinates of ITRF2000.

     f - Definition of the orientation:
			No Net Rotation of Position Constraints [Gipson, 1998]
			were applied to the same 8 stations.

     g - Reference epoch:
    			1997.0

     h - Tectonic plate model:
			ITRF2000 velocity field was used instead of 
			tectonic plate model

     i - Constraints for time evolution:
			No Net Translation Velocity and No Net Velocity
			Rotation [Gipson, 1998] were applied to the same 
			8 stations to tie their horizontal motions with the 
			NNR-NUVEL-1A tectonic plate model.

 7 - Earth orientation: EOP(GAOUA)03 R 01

     a - A priori precession model:
			IAU 2000A Precession-Nutation Model
         
     b - A priori nutation model:
			IAU 2000A Precession-Nutation Model     

     c - Short-period tidal variations in x, y, UT1:
			- Diurnal and semidiurnal tidal variations of
			model [Ray at al., 1994] as described in 
			IERS Conventions 2003 (71 terms);
			- Polar motion induced by the non-tidal variations
			in oceanic angular momentum [de Viron, Goosse, 
			Bizouard and Lambert];
			- Diurnal and semidiurnal variations of polar motion
			due to atmospheric tides [Brzezinski, Bizouard and 
			Petrov, 2002].


 8 - Estimated Parameters:

     a - Celestial Frame:
			right ascension and declination of all sources as 
			global parameters

     b - Terrestrial Frame:
			X0, Y0, Z0 of all stations
			Xdot, Ydot, Zdot of stations with suitable for
			velocity determination history of observations

     c - Earth Orientation:
			x, y, UT1-UTC
			CIP coordinates in GCRS: dX and dY

     d - Others:
			- Clock parameters:
			    a) polynomial coefficients 
			    b) stochastic component of clock behaviour
			- Wet zenith tropospheric delays as a stochastic
			parameter
			- Troposphere gradients as a stochastic parameters



REFERENCES:

Gipson, 1998:  ftp://gemini.gsfc.nasa.gov/pub/misc/jmg/vlbifram.pdf

Ray, R.D., Steinberg, D.J., Chao, B.F., and Cartwright, D.E., 1994, 
Diurnal and Semidiurnal Variations in the Earth's Rotation Rate Induced 
by Oceanic Tides, Science, 264, pp. 830--832.

de Viron, Goosse, Bizouard and Lambert: 
http://hpiers.obspm.fr/eop-pc/models/PM/PM_oceanic_nt_hf_tab.html

Brzezinski, Bizouard and Petrov, 2002, Influence of the atmosphere on 
Earth Rotation: what new can be learned from the recent atmospheric 
angular momentum estimates?, Surveys in Geophysics, 23, 33-69, 2002