Abstract
Millimeter wave (MMW) technology is expanding rapidly into security screening for dangerous items concealed under clothing. It uses safe non-ionizing radiation and penetrates clothing well. We present a new planar system at Ka band for the three-dimensional simultaneous imaging of both sides of an inspected person where the images are produced in real time by a recently proposed generalized holographic reconstruction algorithm. Low-cost linear frequency modulation (LFM) radar technology is used along with a simple but efficient method for system calibration. Experimental characterization of the spatial resolution and the sensitivity of the system prototype has been carried out. It is established that the achieved spatial resolution is 6 mm or better if the item is not obscured by clothing and it may deteriorate to 7 mm depending on the clothing hiding the item. The spatial sensitivity is confirmed to be at least 2 mm.
Highlights
In the last two decades, the threat of terrorism and armed violence has become a major concern around the world [1,2,3]
(3-D)has imaging we propose radar system baseddeveloped on linear frequency modulation radars, inversion which the hardwareHere, design of the aimaging system for verifying the(LFM)
The echo signal received by an Rx antenna is amplified by a low noise amplifier (LNA) and is
Summary
In the last two decades, the threat of terrorism and armed violence has become a major concern around the world [1,2,3]. Millimeter-wave imaging technology has proven to be a safe and effective means for the detection of concealed items on the human body. Heterodyne mixing in the holographic imaging with LFM (GHI-LFM) method has been developed to process the LFM receivers ensures amplitude and phase information in the back-scattered signal from the object of signals [24]. For tests with volunteers various objects indicate the imaging system developed verifying the GHI-LFMcarrying inversion theory, andconcealed the design of its the improved method, and on various experimental characterizations, excellent modules, imagingoncapability in calibration real-life deployment forthewhole-body screening. 3-D imaging prototype are given in Section whereas an improved system calibration method is capability in real-life deployment for whole-body screening. FT with with respect respect to to spectral-frequency spectral-frequencyvariables variables(k (kxx,, kkyy, kzz).)
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