B14. Active millimeter-wave imaging system for hidden weapons detection

In recent years, the need for developing an accurate human body imaging systems for concealed weapons becomes urgent due to the increase of the international terrorism. In this paper, an experimental system for hidden weapons detection is introduced. The system is based on the principles of Synthetic Aperture Radar (SAR) and monostatic radar. The proposed system transmits a very short pulse generated by a vector network analyzer (VNA) to illuminate a three layers target made from jeans, natural leather and reinforced papers. The target construction is chosen to emulate the presence of the human body. The imaging process is carried out by interpolating successive time domain measurements of the probe reflection coefficient S₁₁ at different points. Two types of scanning probes are used the first one is a standard millimetre-wave (MMW) horn antenna while the other one is a hybrid microstrip/horn antenna. The system shows a great ability for imaging and detecting a hidden metallic targets under the jeans layer of the target.