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October 20, 2018

USNO TRF Solution 2005a

Global VLBI/TRF Solution 2005a
February 2005


Presented here is the U.S. Naval Observatory's 2005a 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
3 February, 2005. This included a total of 3271 diurnal sessions
and 3,978,608 measurements of group delay.
The BATCH control file
2005a.cnt along with databases given in 2005a.arc
were used to generate this solution. The output spool file is 2005a.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 606 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 CRF2005a solution qualified
for the list of global sources. Positions for an additional 135 sources
were estimated for each session independently as local parameters.
A total of 116 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 2005a 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 2005a solution with the
GSFC 2005a solution. A weighted leastsquares fit to the
difference plots and the weighted rms are shown on each plot.
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