On the accuracy assessment of celestial reference frame realizations |
| |
| Authors: | Z Malkin |
| |
| Institution: | (1) Central Astronomical Observatory at Pulkovo, Pulkovskoe Ch. 65/1, St. Petersburg, 196140, Russia |
| |
| Abstract: | The scatter of the celestial pole offset (CPO) time-series obtained from very long baseline interferometry (VLBI) observations
is used as a measure of the accuracy of celestial reference frame (CRF) realizations. Several scatter indices (SI), including
some proposed for the first time, are investigated. The first SI is based on residual analysis of CPO series with respect
to a free core nutation (FCN) model. The second group of SIs includes Allan deviation and its extensions, which allow the
treatment of unequally weighted and multidimensional observations. Application of these criteria to several radio source catalogues
(RSCs) showed their ability to perform a preliminary assessment of the quality of each RSC. The 2D Allan deviation estimate
seems to be the most sensitive measure. The proposed extensions of Allan deviation, weighted and multidimensional, can also
be used for the statistical analysis of other time-series. |
| |
| Keywords: | Reference systems Celestial reference frame VLBI Statistical data analysis Accuracy assessment |
| 本文献已被 SpringerLink 等数据库收录！ |
|
