Global VLBI EOP-I Solution 2008a
|
|
USNO Global VLBI Intensive Solution 2008aFebruary 2008
|
Presented here is the U.S. Naval Observatory's i2008a 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 2008 February 18 using dual-frequency observations obtained at 8.4 GHz (X-band) and 2.2 GHz (S-band).
The SOLVE batch control file int2008a.cnt was used to generate a least-squares solution with an output spool file int2008a.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 | int2008a.eop | format description |
| EOP time series, EOB format | int2008a.eob | format description |
| EOP time series, IVS format | int2008a.eopi | format description |
Comparisons
Differences of the i2008a UT1 angles with the IERS 05 C 04 UT1 angles.
| Plot of i2008a minus IERS 05 C04 | PS | JPG |
Linear Regression: bias = 4.1 +/- 0.5 micro-seconds at J2000 Linear Regression: rate = -1.4 +/- 0.2 nano-seconds/day Residuals: w.r.m.s. = 14.1 micro-seconds Residuals: chi2/ndg = 2.77
Differences of the i2008a UT1 angles with the GSFC int22 UT1 angles.
| Plot of i2008a minus gsfint22 | PS | JPG |
Linear Regression: bias = -0.3 +/- 0.8 micro-seconds at J2000 Linear Regression: rate = -0.4 +/- 0.4 nano-seconds/day Residuals: w.r.m.s. = 7.3 micro-seconds Residuals: chi2/ndg = 0.33
Differences of the i2008a UT1 angles with the i2007c UT1 angles.
| Plot of i2008a minus i2007c | PS | JPG |
Linear Regression: bias = -0.4 +/- 0.7 micro-seconds at J2000 Linear Regression: rate = -0.1 +/- 0.3 nano-seconds/day Residuals: w.r.m.s. = 3.9 micro-seconds Residuals: chi2/ndg = 0.10
