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May 20, 2019

USNO TRF/EOP Solution 2007c

Global VLBI TRF/EOP Solution 2007c
October 2007


Presented here is the U.S. Naval Observatory's 2007c global
solution. The Batch SOLVE solution used all available
multibaseline VLBI observations at 8.4 GHz (Xband) and 2.2 GHz
(Sband) from 1979 August 3 through 2007 September 27. This
included a total of 3666 diurnal sessions and 5,061,431
measurements of group delay. The BATCH control
file
2007c.cnt along with databases given in
2007c.arc were used to generate this solution. The output spool
file is
2007c.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 May 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 623 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 CRF2007b solution qualified for the list of global sources.
Positions for an additional 291 sources
were estimated for each session independently as local
parameters.
A total of 144 sources were eliminated due to bad data
or
insufficient number of observations. Positions and velocites for 128
stations were estimated as global parameters.
Tabulated data.
Comparisons
Shown below is a comparison of the USNO 2007c solution with
the
IERS C04_05 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 2007c solution with
the GSFC 2007c solution. 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 2007c solution with
the USNO 2007b solution. A weighted leastsquares fit to
the difference plots and the weighted rms are shown on each plot.
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