Application Of Millimeter - Wave Active Imaging In Examination Of Preserved Objects In Human Body

Security problems in critical infrastructures such as airports and train stations are becoming more and more important because of the increasing of the terrorism. However, the detection of concealed weapons often makes it makes too cumbersome for people to through the checkpoint. The use of Active Millimeter-Wave Radar systems for detection and imaging hidden objects beneath the human body is one of the effective ways to solve the problem.This paper presents related research on Active Millimeter-Wave (AMMW) Imaging for Security Applications. The main work is illustrated as follows:1. The principle and design method of AMMW imaging systems are introduced. The choice of system parameters, the design of the receiver, the selection of scanning mode, etc are given considering the characteristics of active millimeter waves.2. The characteristics of active millimeter wave imaging algorithms are analyzed, and two proper algorithms are given:ω-k algorithm in frequency domain and back-projection algorithm in time domain. The resolution and sampling interval of the system are analyzed in detail. The result of real aperture and synthetic aperture are given.3. Sparse arrays for AMMW imaging are researched, and the simulation results are given.4. Circular scanning for AMMW imaging is researched. The resolution of the system is analyzed using both the width of coverage in the spatial frequency domain and the generalized ambiguous function, and the simulation results are also given.