Thursday


December 13, 2018

USNO VLBI Intensive Solution i2006c
Presented here is the U.S. Naval Observatory's i2006c
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
2006 November 05 using dualfrequency observations obtained at 8.4 GHz
(Xband) and 2.2 GHz (Sband).
The SOLVE batch control file
int2006c.cnt.gz was used to generate a leastsquares solution with
an output spool file
int2006c.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 i2006c UT1 angles with the IERS C04
UT1 angles.
Plot of i2006c minus IERS C04  PS
 JPG 
Linear Regression: bias = 10.0 +/ 0.6 microseconds at J2000
Linear Regression: rate = 6.3 +/ 0.4 nanoseconds/day
Residuals: w.r.m.s. = 13.1 microseconds
Residuals: chi2/ndg = 2.09
Differences of the i2006c UT1 angles with the GSFC int18
UT1 angles.
Plot of i2006c minus gsfint18  PS
 JPG 
Linear Regression: bias = 5.5 +/ 0.9 microseconds at J2000
Linear Regression: rate = 1.9 +/ 0.5 nanoseconds/day
Residuals: w.r.m.s. = 6.8 microseconds
Residuals: chi2/ndg = 0.25
Differences of the i2006c UT1 angles with the i2006b
UT1 angles.
Plot of i2006c minus i2006b  PS
 JPG 
Linear Regression: bias = 0.8 +/ 0.8 microseconds at J2000
Linear Regression: rate = 0.3 +/ 0.5 nanoseconds/day
Residuals: w.r.m.s. = 0.5 microseconds
Residuals: chi2/ndg = 0.00
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