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January 20, 2018

USNO TRF Solution 2003a

Global VLBI/TRF Solution 2003a
May 2003


Presented here is the U.S. Naval Observatory's 2003a global solution.
The Batch SOLVE solution used all available multibaseline VLBI observations
at 8.4 GHz (Xband) and 2.2 GHz (Sband) from 3 August, 1979 through 24
April, 2003. This included a total of 2987 diurnal sessions
and 3,415,392 measurements of group delay. The
BATCH control file 2003a.cnt
along with databases given in 2003a.arc
were used to generate this solution. The output spool file is
2003a.spl.gz. Plotted and tabulated below are the global and session
RMS values for the solution.
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.
1995 to April 2003 (
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.
Station and Source Positions
Positions of 560 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 CRF2003a solution
qualified for the list of global sources. Positions for an additional
150 sources were estimated for each session independently as local parameters.
A total of 123 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.
Comparisons
Shown below is a comparison of the USNO 2003a solution with
the IERS C04 time series. A weighted leastsquares fit to
the difference plots and the weighted rms are shown on each plot.
Shown below is a comparison of the USNO 2003a solution with the
GSFC 2003b solution. A weighted leastsquares fit to the
difference plots and the weighted rms are shown on each plot.
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