Earth orientation from lunar laser ranging and an error analysis of polar motion services

Physics

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Earth Orientation, Earth Rotation, Error Analysis, Lunar Rangefinding, Polar Wandering (Geology), Kalman Filters, Least Squares Method, Universal Time

Scientific paper

Lunar laser ranging (LLR) data are obtained on the basis of the timing of laser pulses travelling from observatories on earth to retroreflectors placed on the moon's surface during the Apollo program. The modeling and analysis of the LLR data can provide valuable insights into earth's dynamics. The feasibility to model accurately the lunar orbit over the full 13-year observation span makes it possible to conduct relatively long-term studies of variations in the earth's rotation. A description is provided of general analysis techniques, and the calculation of universal time (UT1) from LLR is discussed. Attention is also given to a summary of intercomparisons with different techniques, polar motion results and intercomparisons, and a polar motion error analysis.

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