Combinations of Earth-orientation measurements: SPACE97, COMB97, and POLE97 |
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Authors: | R S Gross |
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Institution: | (1) Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 238-332, 4800 Oak Grove Drive, Pasadena, CA 91109, USA e-mail: richard.gross@jpl.nasa.gov; Tel.: +1 818 354 4010; Fax: +1 818 393 6890, US |
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Abstract: | Independent Earth-orientation measurements taken by the space-geodetic techniques of lunar and satellite laser ranging, very-long-baseline
interferometry, and the global positioning system have been combined using a Kalman filter. The resulting combined Earth-orientation
series, SPACE97, consists of values and uncertainties for universal time, polar motion, and their rates spanning the period
28 September 1976 to 3 January 1998 at daily intervals. The space-geodetic measurements used to generate SPACE97 have then
been combined with optical astrometric measurements to form two additional combined Earth-orientation series: (1) COMB97,
consisting of values and uncertainties for universal time, polar motion, and their rates spanning the period 20 January 1962
to 1 January 1998 at 5-day intervals, and (2) POLE97, consisting of values and uncertainties for polar motion and its rate
spanning the period 20 January 1900 to 21 December 1997 at monthly intervals.
Received: 10 August 1998 / Accepted: 31 May 1999 |
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Keywords: | : Earth rotation – Combination – Kalman filter |
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