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Since the first report on our submillimeter-wave imaging system with radar ranging capabilities, several advances have been made in system performance. Range resolution as well as cross-range resolution are significantly improved, and image acquisition time has been reduced from over 5 minutes to under 1 minute. Here we report on performance improvements to specific key components and software that...
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...
We present a high resolution method for spotlight mode SAR imaging that utilizes pole/residue modeling of projected target reflectivity density function and tomographic reconstruction. Utilization of a matrix pencil method (MPM) allows super resolution to be achieved in range for a single imaging angle. Hence the quality of the image reconstructed is also improved. It is shown that the method is very...
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