Tuesday


September 19, 2017

USNO VLBI Intensive Solution i2010a
Presented here is the U.S. Naval Observatory's i2010a
analysis of 1.5 hr dualfrequency VLBI sessions carried out under the
auspices of the International VLBI Service for Geodesy and Astrometry
(IVS) Intensive Program. UT1 angles are determined for most sessions
between 2000 July 06 and 2010 January 25 using dualfrequency
observations obtained at 8.4 GHz (Xband) and 2.2 GHz (Sband).
The SOLVE batch control file
int2010a.cnt.gz was used to generate a leastsquares solution with
an output spool file
int2010a.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 i2010a UT1 angles with the IERS 05 C 04
UT1 angles.
Plot of i2010a minus IERS 05 C04  PS
 JPG 
Linear Regression: bias = 3.4 +/ 0.3 microseconds at J2000
Linear Regression: rate = 4.2 +/ 0.2 nanoseconds/day
Residuals: w.r.m.s. = 16.0 microseconds
Residuals: chi2/ndg = 3.61
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