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June 23, 2018

USNO TRF Solution 2003b

Global VLBI/TRF Solution 2003b
October 2003


Presented here is the U.S. Naval Observatory's 2003b 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 6
September, 2003. This included a total of 3045 diurnal sessions
and 3,531,109 measurements of group delay. The
BATCH control file 2003b.cnt
along with databases given in 2003b.arc
were used to generate this solution. The output spool file is
2003b.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 485 sources were estimated as global parameters. Positions for
an additional 251 sources sources were estimated independently as local
parameters (arcsources). Of these 251 sources, 147 were treated as arcsources
due to weighted RMS position errors > 1.5 or chisquare per degree of freedom > 2.5
in either right ascension or declination as determined in the USNO CRF2003b solution.
The remaining 104 arcsources had fewer that 40 observations or were observed in
only one experiment. A total of 114 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.
Comparisons
Shown below is a comparison of the USNO 2003b 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 2003b solution with the
GSFC 2003c solution. A weighted leastsquares fit to the
difference plots and the weighted rms are shown on each plot.
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