Mathematics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987emeg.book.....f&link_type=abstract
Unknown
Mathematics
Earth (Planet), Geoids, Gravimetry, Gravitational Fields, Mathematical Models, Geopotential Height, Oceanography, Satellite Doppler Positioning
Scientific paper
A model of the Earth's gravitational field was compared with ocean gravimetry data as part of the development of a satellite based system for ocean localization. Results show that model accuracy is: geoid 30 to 40 cm; gravity anomaly 10 to 15 mgals; and vertical deviation component less than 5 sec. The GEOS 3 satellite gives a good altimetric density profile for latitudes below 65 deg, but its altimeter is not accurate enough. SEASAT gives accurate altimetric measurements, but its orbit is not known with the same level of accuracy. The TOPEX-POSEIDON and ERS-1 (ESA) satellites should allow the model to be refined to give decimeter accuracy for the geoid at wavelengths under 100 km. GEOSAT may also be useful, but its data are classified. Until these satellites become operational, the use of the model with ocean gravimetry can give 5 sec accuracy even in perturbed gravimetric zones.
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