Microwave Imaging Using Frequency-Diverse Scattering of a Random Rough surface

Abstract

Single-shot computational microwave imaging of a target is obtained using a frequency-diverse aperture. The idea is to use random rough surfaces to generate random scatterings at various frequencies. Radiation from a conducting rough reflector, normally illuminated by an ultrawideband antenna working within 20–45 GHz frequency range provides random patterns at various frequencies. To offer as much spatially uncorrelated near-field scans as possible four conducting walls are placed around the rough surface. Scattering is calculated using geometrical optics approximation that takes into account multiple interactions. Applying the standard back-projection method and the least-squares reconstruction technique, it is shown that for a 1 square meter image size, by using 801 frequency samples a descent focused image with a pixel size of about 1/801 square meters is realizable.