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Interferometric calibration for DEM enhancing and system characterization in single pass SAR interferometry

In this paper the comparison between different methods to calibrate a digital elevation map (DEM) generated from airborne differential SAR interferometry will be presented. The traditional methods applied phase ramp corrections along the swath derived from the errors in some ground control points (GCP) to improve the DEM. A more advanced technique is proposed based on the sensitivity equations, which are derived by differentiating the basic location equations with respect to the different parameters of the error model. The behavior of the different techniques have been tested with both synthetic and real interferometric SAR data.