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. Uncertainties in polar motion and length-of-day measurements are evaluated empirically using several data series from the space-geodetic techniques of the global positioning system (GPS), satellite laser ranging (SLR), and very long baseline interferometry (VLBI) during 1997–2002. In the evaluation procedure employed here, known as the three-corner hat (TCH) technique, the signal common to each...
Abstract. An approach, based upon the use of a Kalman filter, that is currently employed at the Jet Propulsion Laboratory (JPL) for combining independent measurements of the Earths orientation, is presented. Since changes in the Earths orientation can be described as a randomly excited stochastic process, the uncertainty in our knowledge of the Earths orientation grows rapidly in the absence of measurements...
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