Preliminary estimates of the resolution capability of the Seasat radar altimeter

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Abstract
This paper reports preliminary results on the capability of the SEASAT radar altimeter to resolve short wavelength geoid features. Spectral coherence calculated for pairs of repeat tracks provides an estimate of the shortest repeatable (geoid) wavelength that can be resolved in the data. Coherence is high for wavelengths longer than 70 km but is insignificant for wavelengths shorter than about 30 km. For SEASAT, oceanographic effects may be more significant than the instrument noise in limiting geoidal resolution. A parametric error model for SEASAT data based on repeat track analysis is also presented. This model will be useful for filtering or smoothing SEASAT data.

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