Coregistration of Airborne Synthetic Aperture Radar Data using Optical Flow

Coregistration has been a major concern in SAR interferometric and tomographic processing. The coregistration of real airborne SAR data is challenging in comparison to a spaceborne case. This paper focuses on the problems involved in the coregistration of an airborne dataset obtained from the Wachtberg imaging radar in X-band operated by Fraunhofer FHR. An analysis of the incidence angles and the coherence of each dataset will be used as a measure to understand the reason behind misregistration. We explore the possibility of computing displacements in pixels using existing methods from computer vision. These techniques are very popular for optical data. Here, we test their applicability to radar data with promising outcomes.