Technical description of solution bkgint03 Intensives

 1.  Purpose of solution: Intensive EOP

 2.  Analysis center: Federal Agency for Cartography and Geodesy (BKG Leipzig)

 3.  Short narrative description of solution:

All available Intensive sessions since 1999 were analysed for 
this solution (including the TSUKUBA-WETTZELL experiments since 2002).
Celestial reference frame was fixed to bkg00005 solution (bkg2003c.crf)
except for the 212 defining sources with values taken from the ICRF.Ext1 catalogue.
Terrestrial reference frame VTRF2003 and the associated velocity field 
are used for station coordinates, reference epoche is 1997.0. Only clock 
parameters, tropospheric zenith parameters and UT1 were adjusted using
least squares technique. The UTC epoch is the middle epoch for each session.

 4.  Estimated parameters:

     a. Celestial frame: No

     b. Terrestrial frame: No

     c. Earth orientation: UT1-UTC 

     d. Zenith troposphere: Generally offsets for each session 

     e. Troposphere gradient: No
     
     f. Station clocks: 3h piece-wise linear functions, rate constraint 5*10E-14

     g. Baseline clocks: Not generally used as most are single baseline

     h. Other: No

 5.  Celestial reference frame:                

     a. A priori source positions: bkg00005 solution (bkg2003d.crf)

     b. Source positions adjusted in solution: No

 6 - Terrestrial reference frame:
 
     a. a priori station positions:  VTRF2003

     b. a priori station velocities:  VTRF2003 
                                      
     c. Reference epoch: 1997.0

 7.  Earth orientation: 

     a. A priori precession model: IERS 1996

     b. A priori nutation model: IERS 1996

     c. A priori short-period tidal variations in x, y, UT1: GSFC hf1033cd 
          Model used according to:
          John Gipson, VLBI determination of neglected tidal terms in
          high frequency Earth Orientation Variation.
          Journal of Geophysical Research, Vol. 101, No. B12, p. 28051-28064
          Dec 10, 1996

     d. EOP estimation: UT1-UTC for each session.

 8.  A priori geophysical models:
 
     a. Troposphere: hydrostatic component with NMF mapping function
     
     b. Solid Earth tide: IERS Conventions

     c. Ocean loading: IERS Conventions

     d. Atmosphere loading: none

 9.  Data type: Group delays

 10. Data editing: 5 deg elevation cutoff, editing of outliers 
     during adjustment when necessary

 11. Data weighting:  Observations are weighted using std reported
     in observational files; re-weighting iteration for each session
     to achieve the chi-square unity.
    
 12. Standard errors reported:  Reported formal errors are derived from
     least-squares estimation propagated from data uncertainties and 
     weighted as discussed in #11.
     
 13. Software:  Calc 9.12, SOLVE release: 2003.09.25

 14. Other information: 
     Field 18 contains the session code
     Field 19 contains the duration of experiments