| procedure is developed to recover sea surface heights (SSH) and free-air (FA) gravity anomalies from dense satellite altimeter SSH data with enhanced accuracies over the full spectrum of the gravity field for geological exploration of the sea floor. A key element of the procedure is wavenumber correlation filtering (WCF) of co-linear SSH tracks for the coherent signals of subsurface geological masses. Orbital cross-over adjustments with bias parameters are applied to the filtered SSH data, which are then separated into two groups of ascending and descending attacks and gridded with tensioned splines. A directional sensitive filter (DSF) is developed and applied to reduce residual errors in the orbital adjustments that appear as track patterned SSH. Subtracting sea surface topography from the SSR yields a high resolution estimate of geoid undulations from which FA gravity anomalies can be obtained by the application of a gradient filter.;These procedure are applied to the Geosat Geodetic Mission (GM) data of the southern oceans in a test area of ca. 900 km... |
