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Naval Meteorology and Oceanography Command U.S. Naval Observatory
Wednesday March 29, 2017

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USNO TRF Solution 2005a  

rotating earth

Global VLBI/TRF Solution 2005a
February 2005

rotating earth

Presented here is the U.S. Naval Observatory's 2005a 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 3 February, 2005.   This included a total of 3271 diurnal sessions and 3,978,608 measurements of group delay.   The BATCH control file 2005a.cnt along with databases given in 2005a.arc were used to generate this solution. The output spool file is 2005a.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:  2005a.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 2005a.eop format description
EOP time series IVS format 2005a.eops format description
Correlations between EOP estimates 2005a.crl format description

 

Station and Source Positions

Positions of 606 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 CRF2005a solution qualified for the list of global sources. Positions for an additional 135 sources were estimated for each session independently as local parameters. A total of 116 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 2005a.sta format description
Station velocities 2005a.vel format description
Source positions 2005a.sou format description
Source position time series 2005a.lso format description

Comparisons


Shown below is a comparison of the USNO 2005a 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 (1979-2005) USNO - IERS (2000-2005)
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 2005a solution with the GSFC 2005a solution.  A weighted least-squares fit to the difference plots and the weighted rms are shown on each plot.
 

USNO - GSFC (1979-2005) USNO - GSFC (2000-2005)
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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