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Naval Meteorology and Oceanography Command U.S. Naval Observatory
Thursday November 23, 2017

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USNO VLBI Intensive Solution i2005c

Presented here is the U.S. Naval Observatory's i2005c 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 2005 October 12 using dual-frequency observations obtained at 8.4 GHz (X-band) and 2.2 GHz (S-band).

The SOLVE batch control file int2005c.cnt.gz was used to generate a least-squares solution with an output spool file int2005c.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 int2005c.eop.gz format description
EOP time series, EOB format int2005c.eob.gz format description
EOP time series, IVS format int2005c.eopi.gz format description

Comparisons

Differences of the i2005c UT1 angles with the IERS C04 UT1 angles.

Plot of i2005c minus IERS C04 PS JPG
   Linear Regression: bias = 13.9 +/- 0.7 micro-seconds at J2000
   Linear Regression: rate = -3.7 +/- 0.5 nano-seconds/day

   Residuals: w.r.m.s. = 11.2 micro-seconds
   Residuals: chi2/ndg =  1.45

Differences of the i2005c UT1 angles with the GSFC gsfint13.eopi.gz UT1 angles.

Plot of i2005c minus gsfint13 PS JPG
   Linear Regression: bias = 7.3 +/- 1.0 micro-seconds at J2000
   Linear Regression: rate = 3.3 +/- 0.8 nano-seconds/day

   Residuals: w.r.m.s. = 8.7 micro-seconds
   Residuals: chi2/ndg = 0.40

Differences of the i2005c UT1 angles with the i2005b UT1 angles.

Plot of i2005c minus i2005b PS JPG
   Linear Regression: bias = -0.1 +/- 0.9 micro-seconds at J2000
   Linear Regression: rate =  0.7 +/- 0.7 nano-seconds/day

   Residuals: w.r.m.s. = 4.1 micro-seconds
   Residuals: chi2/ndg = 0.10

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