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Naval Meteorology and Oceanography Command U.S. Naval Observatory
Wednesday March 29, 2017

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USNO VLBI Intensive Solution i2004b

Presented here is the U.S. Naval Observatory's i2004b 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 Sep 27 using dual-frequency observations obtained at 8.4 GHz (X-band) and 2.2 GHz (S-band).

The SOLVE batch control file int2004b.cnt.gz was used to generate a least-squares solution with an output spool file int2004b.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 int2004b.eop.gz format description
EOP time series, EOB format int2004b.eob.gz format description
EOP time series, IVS format int2004b.eopi.gz format description

Comparisons

Differences of the i2004b UT1 angles with the IERS C04 UT1 angles.

   Linear Regression: bias =  9.1 +/- 0.8 micro-seconds at J2000
   Linear Regression: rate = -0.7 +/- 0.7 nano-seconds/day

   Residuals: w.r.m.s. = 17.4 micro-seconds
   Residuals: chi2/ndg = 1.98
Plot of i2004b minus IERS C04 PS JPG

Differences of the i2004b UT1 angles with the i2004a UT1 angles.

   Linear Regression: bias =  0.6 +/- 1.1 micro-seconds at J2000
   Linear Regression: rate = -0.1 +/- 1.0 nano-seconds/day

   Residuals: w.r.m.s. = 6.0 micro-seconds
   Residuals: chi2/ndg = 0.16
Plot of i2004b minus i2004a PS JPG

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