Prototype UWB Radar Object Scanner and Holographic Signal Processing

Subsurface imaging using high frequency impulse ground penetrating radar has long been studied and applied in fields such as geotechnical, environmental, and structural engineering . More recently ultrawideband radar (UWB) technology has stimulated new investigations into aerospace and medical (among others) applications . However it is a common problem that the detection of shallow targets (depth < 20 cm) is hindered by interference between the transmitted and received pulses from shallow electromagnetic impedance contrasts. Mitigating these interference effects requires complex methods of image reconstruction. The authors developed a different approach to short range materials penetrating radar using holographic radar, which measures the phase of the reflected signal. Demonstration holographic radars operating at 2 GHz and 4 GHz can produce useful images with high spatial resolution over a variety of subsurface impedance contrasts .