Global VLBI solution 2023b

OCT 2023

Presented here is the Geospatial Information Authority of Japan's 2023b 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 14 Sep, 2023. This included a total of 7514 diurnal sessions. The BATCH control file gsi2023b.cnt along with databases given in gsi2023b.arc were used to generate this solution. The output spool file is gsi2023b.spl.gz. Single combined least square solution was done. The technical description provides additional details.
In this solution, the following VGOS stations were not estimated of station positions and velocities. GGAO12M, KOKEE12M, MACGO12M, ONSA13NE, ONSA13SW, RAEGYEB and WETTZ13S.

Source positions

Positions of 5407 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.

Source catalogue   Format description

Station positions and velocities

Positions of 177 stations and their velocities were estimated as global parameters. Station positions are given on epoch 2015.01.01

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 (IAU1980) series is dominating.
  1. Plot of the differences with IERS C04 (IAU1980) in X pole coordinates;
  2. Plot of the differences with IERS C04 (IAU1980) in Y pole coordinates;
  3. Plot of the differences with IERS C04 (IAU1980) in UT1 angles;
  4. Plot of the differences with IERS C04 (IAU1980) in nutation in longitude;
  5. Plot of the differences with IERS C04 (IAU1980) 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: 11/07/2023 00:19:38 (UTC)