Wrapped phase from synthetic aperature radar interferometric image pairs.
Unwrapped phase representing terrain elevation.
Perspective rendering of digital terrain elevation map.
We have developed a new algorithm, that uses fast transforms, for robustly solving the previously unsolved weighted least-squares two-dimensional phase unwrapping problem. Phase unwrapping problems arise in scientific applications when a physical quantity (i.e., surface deformation, time delay, terrain elevation, Etc. ) is transduced or related to the phase of a complex signal. These signals are obtained, for example, during optical interferometry experiments, microwave interferometry, coherent sonar beamforming, and other applications. Our new algorithm for weighted least-squares unwrapping can be used to isolate inconsistent regions and provide an exact solution to the weighted unwrapping problem in a robust manner. Our method has been applied in SAR Interferometry and has enabled substantial improvements for terrain elevation mapping. A patent disclosure is in progress.
Wrapped phase from synthetic aperature radar interferometric image pairs.
Unwrapped phase representing terrain elevation.
Perspective rendering of digital terrain elevation map.