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Naval Meteorology and Oceanography Command U.S. Naval Observatory
Sunday May 28, 2017

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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 spool file int2004a.spl.gz. Tabulated below are the session values from this solution.

Earth Orientation Parameters

UT1 angle is determined for each session separately.

EOP time series, Solve format int2004a.eop.gz format description
EOP time series, EOB format int2004a.eob.gz format description
EOP time series, IVS format int2004a.eopi.gz format description

Comparisons

Differences of the i2004a UT1 angles with the IERS C04 UT1 angles.

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 PS JPG

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