Synthetic Aperture Radar Interferometry (SAR) has been identified as one of the most promising fields in Earth Observatio nSystems. Howeve,r SAR Interferometry 2-D Phase Unwrappoing remains as a challenging problem, since several sources of error complicate the procedure. This work focuses on Multifrequency digital Elevation Model (D) extraction. By obtaining data at different frequency bands, more information can be extracted and integrated in a common product and precise DEM products are obtained. The work has been developed in the frame of the SIR-C/X-SAR experiment, taking simulated noisy interferograms for the test of the algorithm. The Multi-frequency approach has been compared to the weighted multigrid technique implemented with an adaptive multiresolution instantaneous frequency estiamtory. The result is very promising, since data fusion provide the advantages of each frequency band. Therefore, a very detailed DEM without global error is obtained.
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