JTRF2013: Plans, Progress, and Results

Tuesday, 16 December 2014
Claudio Abbondanza1,2, Mike Chin2, Richard S Gross3, Michael B Heflin2, Jay W Parker2 and Xiaoping Wu2, (1)University of California Los Angeles, Los Angeles, CA, United States, (2)Jet Propulsion Laboratory, Pasadena, CA, United States, (3)Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
A Kalman filter, KALREF, will be used to determine a combined terrestrial reference frame (TRF) using the input SINEX files produced by the IAG Services for ITRF2013. Using a Kalman filter allows the TRF to be obtained by combining on a weekly basis time series of station positions and Earth orientation parameters. A core set of globally distributed reference stations that have long (> 3 years) observing histories, a minimum number of discontinuities, and that are unaffected by post-seismic displacements will be used to define the frame. Carefully choosing this set of defining stations allows their geophysical motion to be accurately modeled by a superposition of just linear displacements, harmonic seasonal modes, and when needed, a few discontinuities. Datum specifications (origin, scale and orientation) of the resulting frame will be discussed and comparisons to ITRF2008 will be shown.