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Naval Meteorology and Oceanography Command U.S. Naval Observatory
Tuesday September 19, 2017

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USNO TRF/EOP Solution 2007a  

rotating earth

Global VLBI TRF/EOP Solution 2007a
  February 2007

rotating earth

Presented here is the U.S. Naval Observatory's 2007a 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 January, 2007.   This included a total of 3571 diurnal sessions and 4,772,604 measurements of group delay.   The BATCH control file 2007a.cnt along with databases given in 2007a.arc were used to generate this solution. The output spool file is 2007a.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:  2007a.rms

RMS plot   RMS histogram

 

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 Pole position plot
Full EOP time series:  X pole, Ypole, UT angle ( postscript , pdf EOP plot
Full Nutation offset time series:  Longitude and Obliquity  ( postscript , pdf Nutation offsets plot

 

Tabulated data.

EOP time series Solve format 2007a.eop format description
EOP time series IVS format 2007a.eops format description
Correlations between EOP estimates 2007a.crl format description

 

Station and Source Positions

Positions of 623 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 CRF2006c solution qualified for the list of global sources. Positions for an additional 261 sources were estimated for each session independently as local parameters. A total of 144 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 2007a.sta format description
Station velocities 2007a.vel format description
Source positions 2007a.sou format description
Source position time series 2007a.lso format description

Comparisons


Shown below is a comparison of the USNO 2007a 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 (1979-2007) USNO - IERS (2000-2007)
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 2007a solution with the GSFC 2007a solution.  A weighted least-squares fit to the difference plots and the weighted rms are shown on each plot.
 

USNO - GSFC (1979-2007) USNO - GSFC (2000-2007)
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 2007a solution with the USNO 2006c solution.  A weighted least-squares fit to the difference plots and the weighted rms are shown on each plot.
 

2007a - 2006c (1979-2007) 2007a - 2006c (2000-2007)
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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