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

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rotating earth

Global VLBI/TRF Solution 2002c
November 2002

rotating earth

Presented here is the U.S. Naval Observatory's 2002c 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 10 October, 2002.   This included a total of 2905 diurnal sessions and 3,178,488 measurements of group delay.   The BATCH control file 2002c.cnt along with databases given in 2002c.arc were used to generate this solution. The output spool file is 2002c.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:  2002c.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. 1993 to Sept. 2001 ( 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 2002c.eop format description
EOP time series IVS format 2002c.eops format description
Correlations between EOP estimates 2002c.crl format description

 

Station and Source Positions

Positions of 535 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 CRF2002c solution qualified for the list of global sources. Positions for an additional 142 sources were estimated for each session independently as local parameters. Positions and velocites for 119 stations were estimated as global parameters.
 
 

Tabulated data.

Station positions 2002c.sta format description
Station velocities 2002c.vel format description
Source positions 2002c.sou format description
Source position time series 2002c.lso format description

Comparisons


Shown below is a comparison of the USNO 2002c 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 (1979-2002) USNO - IERS (1996-2002)
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 2002c solution with the GSFC 2002c solution.  A weighted least-squares fit to the difference plots and the weighted rms are shown on each plot.
 

USNO - GSFC (1979-2002) USNO - GSFC (1996-2002)
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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