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Naval Meteorology and Oceanography Command U.S. Naval Observatory
Tuesday September 19, 2017

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USNO VLBI Intensive Solution i2010a

Presented here is the U.S. Naval Observatory's i2010a analysis of 1.5 hr dual-frequency 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 dual-frequency observations obtained at 8.4 GHz (X-band) and 2.2 GHz (S-band).

The SOLVE batch control file int2010a.cnt.gz was used to generate a least-squares 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.

EOP time series, Solve format int2010a.eop.gz format description
EOP time series, EOB format int2010a.eob.gz format description
EOP time series, IVS format int2010a.eopi.gz format description

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 micro-seconds at J2000
   Linear Regression: rate = -4.2 +/- 0.2 nano-seconds/day

   Residuals: w.r.m.s. = 16.0 micro-seconds
   Residuals: chi2/ndg =  3.61

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