Novel techniques for 3-D target reconstruction in SAR interferometry

SAR interferometry is now a well established means for deriving topographic maps from pairs of SAR images. The technique involves co-registering two SAR images, taken from slightly different look angles, and then subtracting the phase information to form an interferogram of phase differences. The 3-D image is then reconstructed from the interferogram by a process known as phase unwrapping. The paper describes some new approaches to the problem of phase unwrapping. It begins by outlining the basic steps required for the formation of an interferogram, and then discusses in detail techniques for unwrapping the phase, proposing improvements to existing systems