RADAR INTERFEROGRAM FILTERING FOR GEOPHYSICAL APPLICATIONS

The use of SAR interferometry is often impeded by decorrelation from t hermal noise, temporal change, and baseline geometry. Power spectra of interferograms are typically the sum of a narrow-band component combi ned with broad-band noise. We describe a new adaptive filtering algori thm that dramatically lowers phase noise, improving both measurement a ccuracy and phase unwrapping, while demonstrating graceful degradation in regions of pure noise. The performance of the filter is demonstrat ed with SAR data from the ERS satellites over the Jakobshavns glacier of Greenland.