Statistics – Computation
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jansc..32..393c&link_type=abstract
(American Astronautical Society and American Institute of Aeronautics and Astronautics, Astrodynamics Conference, Lake Placid, N
Statistics
Computation
Earth Motion, Earth Rotation, Navigation Satellites, Orbit Calculation, Polar Regions, Satellite Observation, Navy, Periodic Variations, Polar Orbits, Polar Wandering (Geology), Satellite Drag, Satellite Orbits, Solar Activity Effects
Scientific paper
It is pointed out that orbits of at least two Navy Navigation Satellites are computed by the Defense Mapping Agency, taking into account measurements of the Doppler shift of the signals radiated by the satellites. The satellite orbit computations have provided various scientific results as byproducts. Polar motion, the periodic variation in the direction of the earth's spin axis with respect to the crust, is computed, while the irregular and periodic variations in the earth's rotation, expressed as UT1 minus UTC, is determined experimentally. The present investigation provides a summary of recent analyses of polar motion and UT1 minus UTC results. Anderle (1980) has presented results from UT1 minus UTC for the years 1975-1979. The current report extends the UT1-UTC results to the period 1980-1981 using a different but equivalent computational procedure.
Anderle Richard J.
Colquitt E. S.
Malyevac C. A.
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