March 29, 2017
USNO VLBI Intensive Solution i2004a
Presented here is the U.S. Naval Observatory's i2004a
analysis of 1.5 hr dual-frequency 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 May 19 using dual-frequency
observations obtained at 8.4 GHz (X-band) and 2.2 GHz (S-band).
The SOLVE batch control file
int2004a.cnt.gz was used to generate a least-squares solution with an output
int2004a.spl.gz. Tabulated below are the session values from this
Earth Orientation Parameters
UT1 angle is determined for each session separately.
Differences of the i2004a UT1 angles with the IERS C04
Statistics of the differences UT1 i2004a minus UT1 IERS C04:
Linear Regression: bias = 11.4 +/- 0.9 micro-seconds at J2000
Linear Regression: rate = -4.9 +/- 0.9 nano-seconds/day
Residuals: w.r.m.s. = 11.4 micro-seconds
Residuals: chi2/ndg = 1.55
|Plot of i2004a minus IERS C04
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