Citation
Abstract
The accuracy of VLBI earth rotation (UT1) measurements is examined by intercomparing TEMPO and POLARIS data for 1982 and the first half of 1983. None of these data are simultaneous, and so a proper intercomparison requires accounting for the scatter introduced by the rapid, unpredictable, UTI variations driven by exchanges of angular momentum with the atmosphere. A statistical model of these variations, based on meteorological estimates of the Atmospheric Angular Momentum (AAM) is derived, and the optimal linear (Kalman) smoother for this model is constructed. The scatter between smoothed and independent raw data is consistent with the residual formal errors, which do not depend upon the actual scatter of the UTI data. This represents the first time that an accurate prediction of the scatter between UTI data sets has been possible.
Details
- Volume
- 42-80
- Published
- February 15, 1985
- Pages
- 229–235
- File Size
- 355.5 KB