THE WAVE-NUMBER SHIFT IN SAR INTERFEROMETRY

SAR surveys from separate passes show relative shifts of the ground wa venumber spectra that depend on the local slope and the off-nadir angl e. We discuss the exploitation of this spectral shift for different ap plications: 1) generation of ''low noise'' interferograms benefiting p hase unwrapping, 2) generation of quick-look interferograms, 3) decorr elation reduction by means of tunable SAR systems (TINSAR),1 4) range resolution enhancement, and 5) the combination of SAR data gathered by different platforms (airborne and satellite) for a ''long-time cohere nce'' study.