The impact of celestial pole offset modelling on VLBI UT1 intensive results |
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Authors: | Zinovy Malkin |
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Institution: | 1.Pulkovo Observatory,St. Petersburg,Russia |
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Abstract: | Very Long Baseline Interferometry (VLBI) Intensive sessions are scheduled to provide operational Universal Time (UT1) determinations
with low latency. UT1 estimates obtained from these observations heavily depend on the model of the celestial pole motion
used during data processing. However, even the most accurate precession- nutation model, IAU 2000/2006, is not accurate enough
to realize the full potential of VLBI observations. To achieve the highest possible accuracy in UT1 estimates, a celestial
pole offset (CPO), which is the difference between the actual and modelled precession-nutation angles, should be applied.
Three CPO models are currently available for users. In this paper, these models have been tested and the differences between
UT1 estimates obtained with those models are investigated. It has been shown that neglecting CPO modelling during VLBI UT1
Intensive processing causes systematic errors in UT1 series of up to 20 μas. It has been also found that using different CPO models causes the differences in UT1 estimates reaching 10 μas. Obtained results are applicable to the satellite data processing as well. |
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