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• W1625893351 abstract "Because the Earth is not a rigid homogeneous sphere , the path of a near­ Earth satellite will deviate from a perfect ellipse . If accurate measure­ ments of satellite orbits are available , one can hopefully deduce parameters from the observed orbital motions which model geophysical features. This dissertation gives the results and techniques to estimate one nonstation­ ary variation in the Earth ' s gravity field--the principal lunar semi-diurnal (M2) ocean tide . Since the ocean tides cause periodic perturbations with periods greater than a week in the evolution of the Keplerian elements of a satellite , the mean Kepler!an elements (osculating Keplerian elements less all short period oscillations) are studied • . To date , no investigator has produced mean Keplerian elements accurate enough to observe the small variations caused by the M2 ocean tides . To solve this problem, approximate analytical transformations have been applied which account for large first-order effects . Elimination of very high frequency effects is accomplished with the aid of an ideal low-pass filter . Precise transformations are only part of the solution, however. Accurate orbits significantly affected by ocean tides must be available . Fortunately , two such satellite orbits were obtained--1967-92A, a U. �. Navy satellite , and the NASA satellite , GEOS-3 . Two terms in the harmonic expansion of the M2 global tide height can be observed . Estimates of · these coefficients have been · obtained . These estimates are somewhat smaller than recent published values obtained from numerical solutions of Laplace tidal equations . Application of the satellite derived M2 ocean tide coefficients to the problem of the deceleration of the lunar nean longitude yiels an estimate of -27 . 4 arc seconds/century2 which is in close agreement with recent analyses of ancient eclipses and modern transit data. Because the entire tidal deceleration of the lunar mean longitude can be accounted for by the ocean tide model obtained in this study , it can be inferred that the solid tide phase lag must be less than l� . Knowledge of these important quantities in geophysics and space science, as well as the method developed to extract this information from satellite or�its , are considered important contributions of this study." @default.
• W1625893351 created "2016-06-24" @default.
• W1625893351 creator A5025078192 @default.
• W1625893351 date "1977-05-01" @default.
• W1625893351 modified "2023-09-23" @default.
• W1625893351 title "Application of digital filtering to satellite geodesy" @default.
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