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January 20, 2018

USNO VLBI Intensive Solution i2008a
Presented here is the U.S. Naval Observatory's i2008a
analysis of 1.5 hr dualfrequency VLBI sessions carried out under the
auspices of the International VLBI Service (IVS) Intensive Program.
UT1 angles are determined for most sessions between 2000 July 06 and
2008 February 18 using dualfrequency observations obtained at 8.4 GHz
(Xband) and 2.2 GHz (Sband).
The SOLVE batch control file
int2008a.cnt.gz was used to generate a leastsquares solution with
an output spool file
int2008a.spl.gz. Note that this solution uses
Calc10 (see calc10.ps). Tabulated
below are the session values from this solution.
Earth Orientation Parameters
UT1 angle is determined for each session separately.
Comparisons
Differences of the i2008a UT1 angles with the IERS 05 C 04
UT1 angles.
Plot of i2008a minus IERS 05 C04  PS
 JPG 
Linear Regression: bias = 4.1 +/ 0.5 microseconds at J2000
Linear Regression: rate = 1.4 +/ 0.2 nanoseconds/day
Residuals: w.r.m.s. = 14.1 microseconds
Residuals: chi2/ndg = 2.77
Differences of the i2008a UT1 angles with the GSFC int22
UT1 angles.
Plot of i2008a minus gsfint22  PS
 JPG 
Linear Regression: bias = 0.3 +/ 0.8 microseconds at J2000
Linear Regression: rate = 0.4 +/ 0.4 nanoseconds/day
Residuals: w.r.m.s. = 7.3 microseconds
Residuals: chi2/ndg = 0.33
Differences of the i2008a UT1 angles with the i2007c
UT1 angles.
Plot of i2008a minus i2007c  PS
 JPG 
Linear Regression: bias = 0.4 +/ 0.7 microseconds at J2000
Linear Regression: rate = 0.1 +/ 0.3 nanoseconds/day
Residuals: w.r.m.s. = 3.9 microseconds
Residuals: chi2/ndg = 0.10
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