Conventional SAR images under rich scattering suffer degradation because of ghost images caused by multipath propagation. In this paper, we develop a time reversal SAR (TR-SAR) imaging algorithm for extended (nonpoint-like) targets in rich multipath scattering. We test the TR-SAR algorithm using experimental electromagnetic data collected in a laboratory environment where the extended target (a galvanized steel sheet) is surrounded by a large amount of PVC rods. Our experiments show that the collected EM data in frequency and aperture after TR-SAR processing produces a higher resolution, cleaner target map compared with conventional SAR images.
['Yuanwei Jin', 'José M. F. Moura', "Nicholas O'Donoughue"]
Experimental study of extended target imaging by time reversal SAR