Ramp response signatures for UXOs

Previously, the ramp response has been used to provide images of missile targets for plane wave incidence in free space, which requires multiple incidence angles. Obviously, this is not feasible for buried targets such as unexploded ordnance (UXO); however, a recent development that extends the ramp response into the shadow region of the target has resulted in the generation of scattered fields through the Rayleigh region and beyond, very accurately, S.K. Nag et al. (1999). This same process can be used to generate the length and diameter of UXOs, which has been verified for selected targets in free space. It is observed that this is a unique signature, completely different from those developed from complex natural resonances and consequently supplements them as a signature