Marine geoid from satellite altimeter data

We first computes the deflections of the vertical line over sea from the altimeter data using the simple difference, which reduces greatly the effect of the Dynamic Ocean Topography (DOT) and systematic bias on the deflections of the vertical line. Then, we present a covariance function to approach precisely the marine geoid from the deflections of the vertical line in view of the homogeneity and isotropy of the covariance functions of the anomalous potential elements. And the determination of the geoid makes it possible to separate precisely the DOT from the sea surface height (SSH). Finally, the global marine geoid and DOT are predicted from the Topex/Poseidon and ERS-1/2 altimeter data, which proves that the above-mentioned method is scientific and reasonable.