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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 i2006c

Presented here is the U.S. Naval Observatory's i2006c 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 2006 November 05 using dual-frequency observations obtained at 8.4 GHz (X-band) and 2.2 GHz (S-band).

The SOLVE batch control file int2006c.cnt.gz was used to generate a least-squares solution with an output spool file int2006c.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 int2006c.eop.gz format description
EOP time series, EOB format int2006c.eob.gz format description
EOP time series, IVS format int2006c.eopi.gz format description

Comparisons

Differences of the i2006c UT1 angles with the IERS C04 UT1 angles.

Plot of i2006c minus IERS C04 PS JPG
   Linear Regression: bias = 10.0 +/- 0.6 micro-seconds at J2000
   Linear Regression: rate = -6.3 +/- 0.4 nano-seconds/day

   Residuals: w.r.m.s. = 13.1 micro-seconds
   Residuals: chi2/ndg =  2.09

Differences of the i2006c UT1 angles with the GSFC int18 UT1 angles.

Plot of i2006c minus gsfint18 PS JPG
   Linear Regression: bias =  5.5 +/- 0.9 micro-seconds at J2000
   Linear Regression: rate =  1.9 +/- 0.5 nano-seconds/day

   Residuals: w.r.m.s. = 6.8 micro-seconds
   Residuals: chi2/ndg = 0.25

Differences of the i2006c UT1 angles with the i2006b UT1 angles.

Plot of i2006c minus i2006b PS JPG
   Linear Regression: bias = -0.8 +/- 0.8 micro-seconds at J2000
   Linear Regression: rate = -0.3 +/- 0.5 nano-seconds/day

   Residuals: w.r.m.s. = 0.5 micro-seconds
   Residuals: chi2/ndg = 0.00

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