GPR SAR simulation and image reconstruction

Subsurface object detection has mainly been carried out using conventional ground penetrating radar (GPR) techniques which use a single receiving antenna from which a number of range profiles (known as "A Scope" images) are assembled to form a two-dimensional data field (known as a "B Scope" image). These GPR system have difficulties with high clutter level, surface reflections, limited ground penetration and the required fine resolution. The resolution in the across track and along track directions is limited by the physical aperture in these directions. This paper describes an imaging technique, which uses a single transmitting/receiving antenna to synthesize a two-dimensional planar aperture. Thus a three-dimensional reflectivity image of a scene is generated. The resolution in the across and along track directions is achieved via a SAR aperture synthesis technique. The depth/range resolution is achieved via the transmission of narrowband stepped frequency continuous w ave (SFCW) signals