SAR interferometry
SAR interferometry has been developed to estimate the precise elevation of surfaces that reflect radar signals, thus generating digital elevation models, which can be accurate to the metre. Further, it is possible to monitor slow motion of temporally stable targets with millimetre accuracy. Topics as interferometric data processing, performance evaluation, singleand multi-baseline acquisitions, mechanical stability of the targets (coherence) and differential InSAR stacks processing (persistent scatterers, SBAS) are introduced and discussed. The major applications for land, solid Earth and infrastructure monitoring are presented. If the radar faces targets like forests and glaciers, where electromagnetic wave penetration allows backscatter at different depths, it is then possible to separate the layers using SAR tomography, also discussed. Finally, an overview is made of the most challenging future interferometric systems, like passive bistatic companions or geosynchronous SAR.
SAR interferometry, Page 1 of 2
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