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April 19, 2018

USNO TRF/EOP Solution 2006a

Global VLBI TRF/EOP Solution 2006a
February 2006


Presented here is the U.S. Naval Observatory's 2006a 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 19 January, 2006. This
included a total of 3413 diurnal sessions and 4,377,675
measurements of group delay. The BATCH control
file
2006a.cnt along with databases given in
2006a.arc were used to generate this solution. The output spool
file is
2006a.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. 1998
to Feb 2006 (
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 617 sources were estimated as global
parameters. Sources which participated in 3 or more sessions, had 40 or
more good observations, and normalized residual delays less than 1.3 in
the CRF2006a solution qualified for the list of global sources.
Positions for an additional 197 sources
were estimated for each session independently as local
parameters.
A total of 140 sources were eliminated due to bad data
or
insufficient number of observations. Positions and velocites for 127
stations were estimated as global parameters.
Tabulated data.
Comparisons
Shown below is a comparison of the USNO 2006a 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 2006a solution with
the GSFC 2006a solution. A weighted leastsquares fit to
the difference plots and the weighted rms are shown on each plot.
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