+FILE/REFERENCE
 DESCRIPTION        Centro Geodesia Spaziale,Agenzia Spaziale Italiana,Matera,IT
 OUTPUT             ECEF satellite state vectors
 CONTACT            cinzia.luceri@e-geos.it           
 SOFTWARE           GEODYNII/SOLVE
 HARDWARE           HP xw8200 
 INPUT              LAGEOS 1-2,  Etalon 1-2 NP
-FILE/REFERENCE
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+FILE/COMMENT
*
* general:
* - analysis center			Centro di Geodesia Spaziale,
*                                       Agenzia Spaziale Italiana,Matera,Italy
* - technique				SLR
* - Software				GeodynII/Solve
* dynamic model:
* - gravity field:
*   + static				GGM02C 
*   + degree and order			70x70
*   + time dependent			C(2,0), C(2,1), S(2,1)  as GGM02C specs
* - GM (m**3/s**2)        		398600.4415 km3/s2
* - solid Earth tides			Wahr model
* - ocean tides				Ray GOT4.7  
* - atmospheric tides			Ray&Ponte model 2003
* - direct solar radiation		IERS conventions (2010)
* - albedo          			applied
* - earthshine           		NONE
* - thermal forces			NONE
* - dynamic polar motion                Applied
* - empirical accelerations		Lageos :
*                                       constant and once-per-rev along track,
*                                       once-per-rev cross track estimated
*                                       Etalon:
*                                       constant and once-per-rev along track
*                                       estimated
* - third body attraction		Mercury, Venus, Earth Moon, Mars, Jupiter, 
*                                       Saturn, Uranus, Neptune from DE403
* - relativistic effects		point mass accelerations,
*					Lense-thirring effects, Coriolis force
* reference frame:
* - station coordinates
*   + a priori values			SLRF2008
*   + estimated				all at the mean epoch of the arc
*   + reference point			SLR monument (eccentricities subtracted)
*   + permanent tide            	no 
* - station velocities
*   + a priori values			SLRF2008
*   + estimated				no   
* - earth orientation parameters
*   + a priori values			IERSC04_08         
*   + frequency (days)			1
*   + estimated				yes, at noon of each day
* - precession
*   + model     			IAU2000A
*   + corrections			none
* - nutation   
*   + model     			IAU2000A
*   + corrections			none
* - station deformations
*   + tidal uplift			IERS2003
*   + ocean loading			Scherneck (GOT4.7)
*   + atmospheric pressure loading	none
* - geocenter
*   + motion                            none
*   + tidal frequencies                 yes  
* - pole tide				IERS conventions (2010)
* - definition of the origin 		C(1,0)=C(1,1)=S(1,1)=0
* - definition of the orientation  	loose constraints 
* measurement model:
* - Satellite used			Lageos-I, Lageos-II
*                                       Etalon-I, Etalon-II
* - wavelength of observations (nm)	532.0 423.0 694.3
* - biases:
*   + range biases			applied or estimated for some sites 
*   + time bias				none
*   + tropospheric bias			none
* - data weighting			according to ILRS AWG rules
* - center of mass (m)			according to CoM corr tables   
* - model for tropospheric delay 	Mendes-Pavlis
* - minimum elevation (deg.)		20
* - relativity scale			LET
* - speed of light (m/s)             	299792458 
* - relativistic effects		light time corrections
* integration:
* - arc length				7 days
* - integrator				Cowell
* - step size (s)			90
* - estimated parameters     		6 satellite elements for each satellite arc;
*                                       constant and OPR along track
*                                       OPR cross track;
*                                       range biases for some stations;
*                                      	daily X, Y, UT1 and LOD ; 
* - constraints				loose constraints on estimated parameters
*
-FILE/COMMENT
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