Tuesday


April 23, 2019

USNO VLBI Intensive Solution i2005a
Presented here is the U.S. Naval Observatory's i2005a
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 each session between 2000 July 06 and
2005 Feb 21 using dualfrequency observations obtained at 8.4 GHz
(Xband) and 2.2 GHz (Sband).
The SOLVE batch control file
int2005a.cnt.gz was used to generate a leastsquares solution with
an output spool file
int2005a.spl.gz. Tabulated below are the session values from this
solution.
Earth Orientation Parameters
UT1 angle is determined for each session separately.
Comparisons
Differences of the i2005a UT1 angles with the IERS C04
UT1 angles.
Plot of i2005a minus IERS C04  PS
 JPG 
Linear Regression: bias = 12.7 +/ 0.7 microseconds at J2000
Linear Regression: rate = 4.8 +/ 0.6 nanoseconds/day
Residuals: w.r.m.s. = 12.9 microseconds
Residuals: chi2/ndg = 1.96
Differences of the i2005a UT1 angles with the GSFC gsfint13.eopi.gz
UT1 angles.
Plot of i2005a minus i2004b  PS
 JPG 
Linear Regression: bias = 5.6 +/ 1.1 microseconds at J2000
Linear Regression: rate = 3.0 +/ 0.9 nanoseconds/day
Residuals: w.r.m.s. = 4.9 microseconds
Residuals: chi2/ndg = 0.12
Differences of the i2005a UT1 angles with the i2004b
UT1 angles.
Plot of i2005a minus i2004b  PS
 JPG 
Linear Regression: bias = 0.4 +/ 1.1 microseconds at J2000
Linear Regression: rate = 0.7 +/ 1.0 nanoseconds/day
Residuals: w.r.m.s. = 1.0 microseconds
Residuals: chi2/ndg = 0.005
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