Differential tomography: a new framework for SAR interferometry

In this paper, a new interferometric mode crossing the differential SAR interferometry and multibaseline SAR tomography concepts, can be termed differential SAR tomography, is proposed. Its potentials, coming from the joint elevation-velocity resolution capability, are discussed both in terms of possible novel imaging products, and improved operation of conventional differential interferometry and SAR tomography. Processing is cast in a bidimensional baseline-time spectral analysis framework, with spare sampling. The use of a modern data-dependent bidimensional spectral estimator is proposed for joint baseline-time processing. Promising simulated results are reported.