0 - Technical description of solution bkg2004a.crf
1 - Technique: VLBI
2 - Analysis Centre:
Federal Agency for Cartography and Geodesy (BKG)
Karl-Rothe-Strasse 10-14
D-04105 Leipzig, Germany
and
Geodetic Institute of the University of Bonn (GIUB)
Nussallee 17
D-53115 Bonn, Germany
3 - Software used:
CALC 9.13, SOLVE release: 2003.09.25
4 - Data span:
Jan 1984 - Jan 2004
5 - Celestial Reference Frame: icrf-Ext1
a - Nature:
extragalactic
b - Definition of the orientation:
Constraining the sum of the RA and Dec adjustments of the radio source
positions for the 212 defining sources of ICRF-Ext1 catalogue
to be zero (no-net-rotation)
6 - Terrestrial Reference Frame: vtrf2003 and associated
vtrf2003 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:
No net translation condition for 26 stations in the TRF
(ALGOPARK BR-VLBA DSS45 FD-VLBA FORTLEZA HARTRAO HOBART26 KASHIM34
KASHIMA KAUAI KOKEE LA-VLBA MATERA MK-VLBA NL-VLBA NOTO
NRAO20 NRAO85_3 NYALES20 ONSALA60 RICHMOND SANTIA12 SC-VLBA SESHAN25
WESTFORD WETTZELL)
i.e. sum over all translations of these stations w.r.t.
TRF is zero.
f - Definition of the orientation:
No net rotation condition for 26 stations in the TRF
(ALGOPARK BR-VLBA DSS45 FD-VLBA FORTLEZA HARTRAO HOBART26 KASHIM34
KASHIMA KAUAI KOKEE LA-VLBA MATERA MK-VLBA NL-VLBA NOTO
NRAO20 NRAO85_3 NYALES20 ONSALA60 RICHMOND SANTIA12 SC-VLBA SESHAN25
WESTFORD WETTZELL)
i.e. sum over all rotations of these stations w.r.t. TRF is zero.
g - Reference epoch:
1997.0
h - Tectonic plate model:
None (TRF used as apriori)
i - Constraints for time evolution:
No net velocity adjustment condition in translation
and rotation for 26 stations in the TRF
(ALGOPARK BR-VLBA DSS45 FD-VLBA FORTLEZA HARTRAO HOBART26 KASHIM34
KASHIMA KAUAI KOKEE LA-VLBA MATERA MK-VLBA NL-VLBA NOTO
NRAO20 NRAO85_3 NYALES20 ONSALA60 RICHMOND SANTIA12 SC-VLBA SESHAN25
WESTFORD WETTZELL)
i.e. sum over all velocities adjustments in translation
and rotation of these stations w.r.t. TRF is zero.
7 - Earth orientation:
a - A priori precession model:
IERS 1996
b - A priori nutation model:
IERS 1996
c - Short-period tidal variations in x, y, UT1:
Model used according to:
John Gipson, VLBI determiantion of neglected tidal terms in
high frequency Earth Orientation Variation.
Journal of Geophysical Research, Vol. 101, No. B12, p. 28051 -28064,
Dec 10, 1996.
8 - Estimated Parameters:
a - Celestial Frame:
right ascension and declination of all sources
with a priori variance 1.E-6 rad
b - Terrestrial Frame:
x0, y0, z0, xdot, ydot, zdot
and coordinates series of stations SVETLOE and TIGOCONC estimated in
respective session
c - Earth Orientation:
xp, xpdot, yp, ypdot, UT1-UTC, UT1dot, dpsi, deps
d - Others:
- clock polynomials plus piece-wise linear functions,
with rate constraints of 5.E-14,
- wet zenith tropospheric delays as 60 min piece-wise linear functions,
with rate constraints generally of 50 psec/hr
- troposphere gradients,
offset constraint 0.5 mm, rate constraint 2.0 mm/day