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August 19, 2018

USNO TRF/EOP Solution 2005c

Global VLBI TRF/EOP Solution 2005c
October 2005


Presented here is the U.S. Naval Observatory's 2005c 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 22 September, 2005. This
included a total of 3355 diurnal sessions and 4,169,668
measurements of group delay. The BATCH control
file
2005c.cnt along with databases given in
2005c.arc were used to generate this solution. The output spool
file is
2005c.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 June 2005 (
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 618 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 CRF2005c solution qualified for the list of global sources.
Positions for an additional 159 sources
were estimated for each session independently as local
parameters.
A total of 119 sources were eliminated due to bad data
or
insufficient number of observations. Positions and velocites for 115
stations were estimated as global parameters.
Tabulated data.
Comparisons
Shown below is a comparison of the USNO 2005c 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 2005c solution with
the GSFC 2005d solution. A weighted leastsquares fit to
the difference plots and the weighted rms are shown on each plot.
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