Technical description of solution iaad0001_dsnx
1. Purpose of solution: 24 hour session solution for combination techniques
2 - Analysis Center: Institute of Applied Astronomy Russian Academy of Science
3. Short narrative description of solution:
All available dual-band Mark III/IV/V observations from 1984 on were analysed for this
solution. The CRF is defined by ICRF-t.2 catalogue. The TRF is defined by no-net-translation
and rotation constraints for the coordinates of all sites in a VLBI session related to
VTRF2005. The values of the official list of VLBI antenna axis offsets issued by the
IVS Analysis Coordinator (update 20050106) were used.
4. Estimated parameters:
a. celestial frame: No
b. terrestrial frame: X, Y, Z
c. Earth orientation: CIP-X, CIP-Y, Xp, Yp, UT1-UTC, Xpdot, Ypdot, LOD
d. zenith troposphere: linear trend+stochastic
e. troposphere gradient: east and north offset
f. station clocks: quadratic trend+stochastic
g. other: No
5. Celestial reference frame:
a. a priori source positions: ICRF-ext.2
b. definition of orientation: fixed source coordinates of the ICRF-ext.2
6 - Terrestrial reference frame:
a. a priori station positions: VTRF2005
b. a priori station velocities: VTRF2005
c. reference epoch: 1997.0
d. station positions adjusted in solution: Yes
e. definition of origin, orientation, and their time evolution:
no-net-translation and no-net-rotation of position with respect to
VTRF2005 for all stations of the VLBI session
7. Earth orientation:
a. a priori precession-nutation model: IAU2000A
b. Short-period tidal variations in x, y, UT1:
IERS Convetions(2003) recomended model
d. EOP estimation: CIP-X, CIP-Y, Xp, Yp, UT1-UTC, Xpdot, Ypdot, LOD each session
for the middle epoch of it
8. A priori geophysical models:
a. troposphere: hydrostatic component with VMF1 mapping function
b. solid Earth tide: IERS Conventions(2003)
c. ocean loading: IERS Conventions(2003)
d. atmosphere loading: regression model
9. Data type: Group delays
10. Data editing: editing of outliers during adjustment when necessary.
11. Data weighting: Observations are weighted using std reported
in observational files
12. Standard errors reported: Reported formal errors are derived from
least-squares estimation propagated from data uncertainties and
re-weighted to achieve the chi-square unity.
13 Software: QUASAR