The shape of the earth

Statistics – Applications

Scientific paper

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Geodesy, Geoids, Mapping, Orbit Calculation, Harmonic Analysis, Laser Applications, Orbital Resonances (Celestial Mechanics), Photographic Recording, Pulsed Lasers, Satellite Observation

Scientific paper

An historical overview of the evolution of geodesy is presented, and the contributions of satellite geodesy are considered in detail. The development of satellite tracing techniques, from visual observation and observations from kinetheodolites to photographic, Doppler, and laser tracking techniques, is reviewed. Different methods of using observed perturbations in satellite orbits in calculating the geoid are described and compared. Special attention is given to the analysis of resonant orbits. Measurement techniques in the first stages of implementation, including satellite-to-satellite tracking, use of radio altimeters to measure a satellite's height over the ocean, and use of satellite-borne gravity gradiometers to provide accurate measurements of gravity gradients, are outlined. Possible applications of geodesy in such fields as seismology and meteorology are considered.

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