Tuesday


October 22, 2019

USNO VLBI Intensive Solution i2007a
Presented here is the U.S. Naval Observatory's i2007a
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
2007 February 25 using dualfrequency observations obtained at 8.4 GHz
(Xband) and 2.2 GHz (Sband).
The SOLVE batch control file
int2007a.cnt.gz was used to generate a leastsquares solution with
an output spool file
int2007a.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 i2007a UT1 angles with the IERS C04
UT1 angles.
Plot of i2007a minus IERS C04  PS
 JPG 
Linear Regression: bias = 10.6 +/ 0.6 microseconds at J2000
Linear Regression: rate = 6.7 +/ 0.3 nanoseconds/day
Residuals: w.r.m.s. = 14.7 microseconds
Residuals: chi2/ndg = 2.77
Differences of the i2007a UT1 angles with the GSFC int19
UT1 angles.
Plot of i2007a minus gsfint19  PS
 JPG 
Linear Regression: bias = 3.4 +/ 0.8 microseconds at J2000
Linear Regression: rate = 2.4 +/ 0.5 nanoseconds/day
Residuals: w.r.m.s. = 6.7 microseconds
Residuals: chi2/ndg = 0.26
Differences of the i2007a UT1 angles with the i2006c
UT1 angles.
Plot of i2007a minus i2006c  PS
 JPG 
Linear Regression: bias = 0.6 +/ 0.8 microseconds at J2000
Linear Regression: rate = 0.4 +/ 0.4 nanoseconds/day
Residuals: w.r.m.s. = 1.1 microseconds
Residuals: chi2/ndg = 0.01
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