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A New Approach To Topographic Altimetry

A technique for surveying the earth's topographic elevation from satellites with a pulse-limited altimeter is investigated. The technique is based on a novel data processing scheme that will permit the formation of synthetic resolution from power-detected radar echoes from incoherent targets. The proposal is unusual in that the detector is nonlinear, but is based on the observation that the mean power of incoherent radar clutter is a linear functional of the scatterer density. The method is examined theoretically, and it is shown the technique is practicable for the surface geometries examined. Limitations imposed by the nature of normal incidence backscatter are discussed, and key areas needing further work are identified.