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

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USNO TRF/EOP Solution 2006b  

rotating earth

Global VLBI TRF/EOP Solution 2006b
  June 2006

rotating earth

Presented here is the U.S. Naval Observatory's 2006b 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 25 May, 2006.   This included a total of 3467 diurnal sessions and 4,470,209 measurements of group delay.   The BATCH control file 2006b.cnt along with databases given in 2006b.arc were used to generate this solution. Note that this solution marks the transition to the use of Calc10 (see calc10.ps).  The output spool file is 2006b.spl.gz. Plotted and tabulated below are the global and session RMS values for the solution.
 

Solution RMS delay and rate 
( postscript , pdf )

Solution RMS histograms
( postscript , pdf )

RMS data file:  2006b.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. 1998 to May 2006 ( 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 2006b.eop format description
EOP time series IVS format 2006b.eops format description
Correlations between EOP estimates 2006b.crl format description

 

Station and Source Positions

Positions of 618 sources were estimated as global parameters. Sources which participated in 3 or more sessions, had 40 or more good observations, and normalized residual delays less than 1.3 in the CRF2006b solution qualified for the list of global sources. Positions for an additional 257 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 127 stations were estimated as global parameters.
 
 

Tabulated data.

Station positions 2006b.sta format description
Station velocities 2006b.vel format description
Source positions 2006b.sou format description
Source position time series 2006b.lso format description

Comparisons


Shown below is a comparison of the USNO 2006b 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 (1979-2006) USNO - IERS (2000-2006)
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 2006b solution with the GSFC 2006b solution.  A weighted least-squares fit to the difference plots and the weighted rms are shown on each plot.
 

USNO - GSFC (1979-2006) USNO - GSFC (2000-2006)
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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