Global VLBI solution 2018a

MAR 2018

Presented here is the Geospatial Information Authority of Japan's 2018a global solution. The Batch SOLVE solution used all available multi-baseline VLBI observations at 8.4 GHz (X-band) and 2.2 GHz (S-band) from April, 1980 through 12 Feb, 2018. This included a total of 6186 diurnal sessions. The BATCH control file gsi2018a.cnt along with databases given in gsi2018a.arc were used to generate this solution. The output spool file is gsi2018a.spl.gz. Single combined least square solution was done.

Source positions

Positions of 2087 sources were estimated as global parameters. A source was required to have at least 6 good observations in at least one session. Three gravitational lenses, 0218+357/0218+35A/0218+35B, 1830-21A/1830-21B/1830-211, and 1422+231 were excluded. The positions of 39 sources were estimated as arc parameters (a position for each session). These are the ICRF2 'special handling' sources that showed the most instability. Position of all other sources were estimated in each session individually.
Source catalogue   Format description
Source positions time series   Format description

Station positions and velocities

Positions of 169 stations and their velocities were estimated as global parameters. Station positions are given on epoch 2010.01.01

Station positions catalogue   Format description
Station velocity catalogue   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 EOP format   Format description
EOP time series in Solve NUT format   Format description
Correlations between EOP estimates   Format description

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 batch Solve solution.   Description of Solve batch control language.
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Last update: 03/30/2018 04:53:52 (UTC)