Technical description of solution mao2003o
1. Purpose of solution: session EOP
2. Analysis center: Main Astronomical Observatory,
National Academy of Sci. of Ukraine (MAO NASU), Kiev
3. Short narrative description of solution:
Almost all available VLBI sessions conducted since 2000 were processed.
Data analysis was performed according to IERS Conventions 2003 (except
atmospheric pressure loading model). Coordinates of stations were
estimated as global parameters, EOP were estimated as local for each
session(s) and clock function, wet zenith delay and its gradients was
treated as stochastic ones modelled by random walk process. Square root
information filter (SRIF) was used for data processing.
4. Estimated parameters:
a. celestial frame: none
b. terrestrial frame: X0, Y0, Z0
c. Earth orientation: x, y, UT1-TAI, X_CIP, Y_CIP
d. zenith troposphere: stochastic with random walk model
e. troposphere gradient: stochastic with random walk model
f. station clocks: polynomials + stochastic with random walk model
g. baseline clocks: none
h. other: none
5. Celestial reference frame:
a. a priori source positions: ICRF-Ext.1
b. source positions adjusted in solution: no
6 - Terrestrial reference frame:
a. a priori station positions: ITRF2000 (except new stations)
b. a priori station velocities: ITRF2000 velocity field, NNR-NUVEL-1A model
was used if a station velocity from ITRF2000 solution is equal to zero
c. reference epoch: 1997.0
d. station positions/velocities adjusted in solution: yes
e. definition of origin, orientation, and their time evolution:
Evolution of the TRF is set by no-net-translation and no-net-rotation,
conditions on the horizontal position adjustments of the following
stations: ONSALA60, WETTZELL, HARTRAO, ALGOPARK, KOKEE, WESTFORD,
FORTLEZA and HOBART26
f. station parameter estimation: X0, Y0, Z0
h. stations with discontinuous positions and date of discontinuity: none
i. stations with nonlinear velocities: none
j. relativity scale: consistent with TT
k. permanent tide correction: no
l. solution identification or reference: mao2003o
7. Earth orientation:
a. a priori precession model: IAU 2000A
b. a priori nutation model: IAU 2000A
c. a priori short-period tidal variations in x, y, UT1:
- ocean tidal variations in x, y and UT1, Ray et. al., 1994 according to
IERS Conventions 2003 notation;
- atmospheric tidal variations in x, y and UT1, Brzezinski, Bizouard and
Petrov, 2002;
- non-tidal variations in oceanic angular momentum, de Viron et. al.
d. EOP estimation: x, y, UT1, X_CIP, Y_CIP for each session(s)
8. A priori geophysical models:
a. troposphere: MTT mapping function for hydrostatic and wet zenith delays
if metheo parameters were good, NMFh2 and NMFw2 were used for stations
with suspicious metheo parameters.
b. solid Earth tide: IERS Conventions 2003
c. ocean loading: IERS Conventions 2003, based on GOT00.2 Ocean tide model
d. atmosphere loading: none
9. Data type: delays
10. Data editing: outliers were removed from analysis
11. Data weighting: uncertainties of time and ionosphere delays were used for
weights calculation
12. Standard errors reported: formal errors derived from SRIF estimation
procedure
13 Software: SteelBreeze-2.0.2
14. Other information:
For comments or questions contact S.Bolotin .