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June 18, 2018

USNO TRF Solution 2004b

Global VLBI/TRF Solution 2004b
October 2004


Presented here is the U.S. Naval Observatory's 2004b 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
29 April, 2004. This included a total of 3211 diurnal sessions
and 3,886,631 measurements of group delay.
The BATCH control file
2004b.cnt along with databases given in 2004b.arc
were used to generate this solution. The output spool file is
2004b.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.
1996 to August 2004 (
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 608 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 CRF2004b solution qualified
for the list of global sources. Positions for an additional 115 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 113 stations were estimated as global parameters.
Tabulated data.
Comparisons
Shown below is a comparison of the USNO 2004b 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 2004b solution with the
GSFC 2004b solution. A weighted leastsquares fit to the
difference plots and the weighted rms are shown on each plot.
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