Detection of unexploded ordnance (UXO) using physical optics (PO) simulated images as templates

摘要

We present results of an unexploded ordnance (UXO) detection algorithm based on template matching in ultra-wideband (UWB) (130 MHz to 1.2 GHz) synthetic aperture radar (SAR) data. We compute scattered fields of UXOs in different orientations, both on the surface and buried at different depths, using a physical optics (PO) approximation for perfectly conducting targets in a half space via the half-space Green's function. The PO code that we develoed computes the scattered fields in a lossy and dispersive material. This permits simulation of targets in real soil. The frequency-domain scattered fields are transformed into time-domain. SAR images of the UXOs at different aspect are generated by a standard backprojection technique, with the same resolution as the ground-penetrating (GPEN) ultra-wideband (UWB) SAR. These SAR images form the templates for detection of the UXOs.