Experimental studies of 'Hard Wall Radar imaging' of objects shielded from line-of-sight

The technology of “Through-the-Wall Radar imaging” (TWRI) enables us to see through the walls by reconstructing the image based on the backscattered waves passing through the opaque dielectric wall. However, when the electromagnetic waves cannot penetrate the walls (such as metallic walls), a new problem called “Hard-Wall Radar Imaging” (HWRI) emerges as we have discussed in our previous papers. Because in this problem the objects are located in the shadow region, where only diffracted field around edges can be reflected back, the conventional imaging techniques are not applicable.