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Naval Meteorology and Oceanography Command U.S. Naval Observatory
Sunday May 28, 2017

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USNO TRF Solution 2004b  

rotating earth

Global VLBI/TRF Solution 2004b
October 2004

rotating earth

Presented here is the U.S. Naval Observatory's 2004b 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 29 April, 2004.   This included a total of 3211 diurnal sessions and 3,886,631 measurements of group delay.   The BATCH control file 2004b.cnt along with databases given in 2004b.arc were used to generate this solution. The output spool file is 2004b.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:  2004b.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. 1996 to August 2004 ( 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 2004b.eop format description
EOP time series IVS format 2004b.eops format description
Correlations between EOP estimates 2004b.crl format description

 

Station and Source Positions

Positions of 608 sources were estimated as global parameters. Sources which participated in 2 or more sessions, had 40 or more good observations, and normalized residual delays less than 1.3 in the CRF2004b solution qualified for the list of global sources. Positions for an additional 115 sources were estimated for each session independently as local parameters. A total of 134 sources were eliminated due to bad data or insufficient number of observations. Positions and velocites for 113 stations were estimated as global parameters.
 
 

Tabulated data.

Station positions 2004b.sta format description
Station velocities 2004b.vel format description
Source positions 2004b.sou format description
Source position time series 2004b.lso format description

Comparisons


Shown below is a comparison of the USNO 2004b 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 (1979-2004) USNO - IERS (2000-2004)
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 2004b solution with the GSFC 2004b solution.  A weighted least-squares fit to the difference plots and the weighted rms are shown on each plot.
 

USNO - GSFC (1979-2004) USNO - GSFC (2000-2004)
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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