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Naval Meteorology and Oceanography Command U.S. Naval Observatory
Thursday November 23, 2017

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USNO TRF Solution 2003b  

rotating earth

Global VLBI/TRF Solution 2003b
October 2003

rotating earth

Presented here is the U.S. Naval Observatory's 2003b 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 3 August, 1979 through 6 September, 2003.   This included a total of 3045 diurnal sessions and 3,531,109 measurements of group delay.   The BATCH control file 2003b.cnt along with databases given in 2003b.arc were used to generate this solution. The output spool file is 2003b.spl.gz. Plotted and tabulated below are the global and session RMS values for the solution.
 

Solution RMS delay and rate 
( postscript , pdf

RMS data file:  2003b.rms


 

Earth Orientation Parameters

The Earth Orientation parameters:  X and Y pole positions and rates, UT1 angle and rate, and daily offsets in the nutation in longitude and obliquity were estimated for each session separately.  Plotted and tabulated below are these data.
 
Pole Position X vs. Y:  Jan. 1995 to April 2003 ( postscript , pdf
Full EOP time series:  X pole, Ypole, UT angle ( postscript , pdf
Full Nutation offset time series:  Longitude and Obliquity  ( postscript , pdf

 

Tabulated data.

EOP time series Solve format 2003b.eop format description
EOP time series IVS format 2003b.eops format description
Correlations between EOP estimates 2003b.crl format description

 

Station and Source Positions

Positions of 485 sources were estimated as global parameters. Positions for an additional 251 sources sources were estimated independently as local parameters (arc-sources). Of these 251 sources, 147 were treated as arc-sources due to weighted RMS position errors > 1.5 or chi-square per degree of freedom > 2.5 in either right ascension or declination as determined in the USNO CRF2003b solution. The remaining 104 arc-sources had fewer that 40 observations or were observed in only one experiment. A total of 114 sources were eliminated due to bad data or insufficient number of observations. Positions and velocites for 114 stations were estimated as global parameters.
 
 

Tabulated data.

Station positions 2003b.sta format description
Station velocities 2003b.vel format description
Source positions 2003b.sou format description
Source position time series 2003b.lso format description

Comparisons


Shown below is a comparison of the USNO 2003b solution with the IERS C04 time series.  A weighted least-squares fit to the difference plots and the weighted rms are shown on each plot.
 

USNO - IERS (1979-2003) USNO - IERS (1996-2003)
Pole Position  ( postscript pdf ) Pole Position  ( postscript pdf )
UT1 - UTC  ( postscript pdf ) UT1 - UTC  ( postscript pdf )
Nutation Offset  ( postscript pdf ) Nutation Offset  ( postscript pdf )

 

Shown below is a comparison of the USNO 2003b solution with the GSFC 2003c solution.  A weighted least-squares fit to the difference plots and the weighted rms are shown on each plot.
 

USNO - GSFC (1979-2003) USNO - GSFC (1996-2003)
Pole Position  ( postscript pdf ) Pole Position  ( postscript pdf )
UT1 - UTC  ( postscript pdf ) UT1 - UTC  ( postscript pdf )
Nutation Offset  ( postscript pdf ) Nutation Offset  ( postscript pdf )


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