[G04-2] Earth rotation and geodynamics II

[G04-2-01] On application of the Kalman filter for high resolution estimation of Earth orientation parameters using the ring laser and VLBI data

^○Monika Tercjak¹, Aleksander Brzezinski^{1, 2}, Tobias Nilsson³, Harald Schuh³ (1.Warsaw University of Technology, Warsaw, Poland, 2.Space Research Centre, Polish Academy of Sciences, Warsaw, Poland, 3.GFZ German Research Centre for Geosciences, Potsdam, Germany)

Ring laser gyroscope (RLG) is a promising new technology for directly and continuously measuring changes in Earth orientation; see, e.g., (Schreiber and Wells, 2013, Review of Scientific Instruments 84, 041101) for details. The Sagnac frequency observed by a RLG is sensitive to temporal variations of the instantaneous rotation pole (IRP), while the space geodetic techniques report the terrestrial and celestial motions of the conventional Celestial Intermediate Pole (CIP). The two poles are close to each other when considering variation with periods of the order of weeks and longer, but behave differently at daily and subdaily periods. Here we discuss the possibility of a simultaneous use of the observations of ring laser and very long baseline interferometry (VLBI) for determination of Earth Orientation Parameters with hourly resolution. The combination of RLG and VLBI data is done by a Kalman filter which incorporates the first-order kinematical relationships between the motions of the CIP and IRP.