Microwave imaging by scattering

A microwave imaging method, which can be applied in detection of concealed weapons and contraband and security in public situations, is presented. In the method, the radar scans on a rectangular plane, i.e. synthesizing a rectangular planar aperture. Synthetic aperture processing for radar data can improve resolutions of the image and the detecting ability of radar. The system can be quasi-monostatic and only a monochromatic microwave is required to illuminate the target to be imaged. Utilizing the phase and amplitude information recorded over a two-di-mensional (2-D) aperture can reconstruct a focused 2-D image of the target. A fully 2-D image-reconstruction algorithm, which can be applied in near-field, is developed and deduced. The processing results of simulation and measurement data show that the image-reconstruction algorithm can produce a microwave image with high spatial and radiation resolutions, and has the ability to detect in range without three-dimensional imaging.