Tuesday


February 20, 2018

USNO VLBI Intensive Solution i2004b
Presented here is the U.S. Naval Observatory's i2004b
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
2004 Sep 27 using dualfrequency observations obtained at 8.4 GHz
(Xband) and 2.2 GHz (Sband).
The SOLVE batch control file
int2004b.cnt.gz was used to generate a leastsquares solution with
an output spool file
int2004b.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 i2004b UT1 angles with the IERS C04
UT1 angles.
Linear Regression: bias = 9.1 +/ 0.8 microseconds at J2000
Linear Regression: rate = 0.7 +/ 0.7 nanoseconds/day
Residuals: w.r.m.s. = 17.4 microseconds
Residuals: chi2/ndg = 1.98
Plot of i2004b minus IERS C04  PS
 JPG 
Differences of the i2004b UT1 angles with the i2004a
UT1 angles.
Linear Regression: bias = 0.6 +/ 1.1 microseconds at J2000
Linear Regression: rate = 0.1 +/ 1.0 nanoseconds/day
Residuals: w.r.m.s. = 6.0 microseconds
Residuals: chi2/ndg = 0.16
Plot of i2004b minus i2004a  PS
 JPG 
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