Goddard VLBI global solution 2007a

Goddard global solution 2007a used all available dual band VLBI observations (except VLBA Calibrator Survey) at 8.4 GHz and 2.2 GHz from 1979.08.03 to 2006.12.14, 4232 diurnal sessions, 5,330,408 measurements of group delays.
Single combined least square solution was done. Technical description provides additional details.

Source positions

Positions of 710 sources were estimated as global parameters. The sources that A) were observed in two or more sessions and had 40 or more good observations or B) were observed only in one session and had 25 or more good observations were included in the group of sources whose positions were estimated as global parameters. Positions of these sources are presented in catalogue 2007a.sou . The sources which had only one good observation as well as two gravitational lenses, 0218+35A/0218+35B and 1830-21A/1830-21B, were excluded from the dataset. Position of other 204 sources were estimated in each session individually. Time series of their positions are presented in 2007a.lso file. Mean values of their position are presented in catalogue 2007a_lso.sou .

Source catalogue 2007a.sou Format description
Source catalogue 2007a_lso.sou Format description
Source positions time series Format description
Statistics of observed sources

Station positions and velocities

Positions of 153 stations and their velocities were estimated as global parameters. Station positions are given on epoch 1997.01.01

Station positions catalogue Format description
Station velocity catalogue Format description
Catalogue of station positions and velocities in Sinex format Format description Format amendment
Catalogue of antenna axis offsets Format description

Earth orientation parameters

Pole coordinates X, Y, UT1 angle, and their rate, daily correction to the nutation in longitude and nutation in obliquity were estimated for each session separately.

EOP time series in Solve EOB format Format description
EOP time series in Solve NUT format Format description
EOP time series in IVS format Format description
Correlations between EOP estimates Format description

Assessment of accuracy of EOP series

Comparison of EOP parameters determined from 80 simultaneous 24 hours VLBI experiments at networks CORE-A and NEOS-A.
  1. Plot of differences in X pole coordinates;

  2. Plot of differences in Y pole coordinates;

  3. Plot of differences in UT1 angles;

  4. Plot of differences in nutation in longitude;

  5. Plot of differences in nutation in obliquity;

  6. Plot of differences in X pole rates;

  7. Plot of differences in Y pole rates;

  8. Plot of differences in UT1 rates;

  9. Table of statistics of the differences.

Statistics

wrms for each session Format description

Comparison of EOP series

Comparison with IERS C04 series shows random noise with slight linear trend with scatter comparable with the accuracy of VLBI EOP series, except UT1 where the noise of IERS C04 series is dominating.
  1. Plot of the differences with IERS C04 in X pole coordinates;

  2. Plot of the differences with IERS C04 in Y pole coordinates;

  3. Plot of the differences with IERS C04 in UT1 angles;

  4. Plot of the differences with IERS C04 in nutation in longitude;

  5. Plot of the differences with IERS C04 in nutation in obliquity;

  6. Table of statistics of the differences.

Miscellaneous

Control file for the batch Solve solution. Description of Solve batch control language.
VLBI experiments list for the batch Solve solution. Description of Solve batch control language.
in spool format.
Listing of the Solve solution.
Back to Goddard VLBI solution page.
Web page was prepared by Leonid Petrov ()
Last update 27-DEC-2006 17:27:59