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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 i2007b

Presented here is the U.S. Naval Observatory's i2007b 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 most sessions between 2000 July 06 and 2007 July 18 using dual-frequency observations obtained at 8.4 GHz (X-band) and 2.2 GHz (S-band).

The SOLVE batch control file int2007b.cnt.gz was used to generate a least-squares solution with an output spool file int2007b.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 int2007b.eop.gz format description
EOP time series, EOB format int2007b.eob.gz format description
EOP time series, IVS format int2007b.eopi.gz format description

Comparisons

Differences of the i2007b UT1 angles with the IERS C 04 UT1 angles.

Plot of i2007b minus IERS C04 PS JPG
   Linear Regression: bias =  8.3 +/- 0.5 micro-seconds at J2000
   Linear Regression: rate = -5.0 +/- 0.3 nano-seconds/day

   Residuals: w.r.m.s. = 12.8 micro-seconds
   Residuals: chi2/ndg =  2.15

Differences of the i2007b UT1 angles with the IERS 05 C 04 UT1 angles.

Plot of i2007b minus IERS 05 C04 PS JPG
   Linear Regression: bias =  2.8 +/- 0.5 micro-seconds at J2000
   Linear Regression: rate =  0.7 +/- 0.3 nano-seconds/day

   Residuals: w.r.m.s. = 14.0 micro-seconds
   Residuals: chi2/ndg =  2.57

Differences of the i2007b UT1 angles with the GSFC int20 UT1 angles.

Plot of i2007b minus gsfint20 PS JPG
   Linear Regression: bias =  5.4 +/- 0.8 micro-seconds at J2000
   Linear Regression: rate =  0.5 +/- 0.4 nano-seconds/day

   Residuals: w.r.m.s. = 6.7 micro-seconds
   Residuals: chi2/ndg = 0.27

Differences of the i2007b UT1 angles with the i2007a UT1 angles.

Plot of i2007b minus i2007a PS JPG
   Linear Regression: bias =  0.6 +/- 0.8 micro-seconds at J2000
   Linear Regression: rate = -0.9 +/- 0.4 nano-seconds/day

   Residuals: w.r.m.s. = 1.1 micro-seconds
   Residuals: chi2/ndg = 0.01

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