Friday


April 20, 2018

USNO VLBI Intensive Solution i2007b
Presented here is the U.S. Naval Observatory's i2007b
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
2007 July 18 using dualfrequency observations obtained at 8.4 GHz
(Xband) and 2.2 GHz (Sband).
The SOLVE batch control file
int2007b.cnt.gz was used to generate a leastsquares solution with
an output spool file
int2007b.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 i2007b UT1 angles with the IERS C 04
UT1 angles.
Plot of i2007b minus IERS C04  PS
 JPG 
Linear Regression: bias = 8.3 +/ 0.5 microseconds at J2000
Linear Regression: rate = 5.0 +/ 0.3 nanoseconds/day
Residuals: w.r.m.s. = 12.8 microseconds
Residuals: chi2/ndg = 2.15
Differences of the i2007b UT1 angles with the IERS 05 C 04
UT1 angles.
Plot of i2007b minus IERS 05 C04  PS
 JPG 
Linear Regression: bias = 2.8 +/ 0.5 microseconds at J2000
Linear Regression: rate = 0.7 +/ 0.3 nanoseconds/day
Residuals: w.r.m.s. = 14.0 microseconds
Residuals: chi2/ndg = 2.57
Differences of the i2007b UT1 angles with the GSFC int20
UT1 angles.
Plot of i2007b minus gsfint20  PS
 JPG 
Linear Regression: bias = 5.4 +/ 0.8 microseconds at J2000
Linear Regression: rate = 0.5 +/ 0.4 nanoseconds/day
Residuals: w.r.m.s. = 6.7 microseconds
Residuals: chi2/ndg = 0.27
Differences of the i2007b UT1 angles with the i2007a
UT1 angles.
Plot of i2007b minus i2007a  PS
 JPG 
Linear Regression: bias = 0.6 +/ 0.8 microseconds at J2000
Linear Regression: rate = 0.9 +/ 0.4 nanoseconds/day
Residuals: w.r.m.s. = 1.1 microseconds
Residuals: chi2/ndg = 0.01
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