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In this work, we developed and proposed an auto‐classification technique for concealed weapon detection (CWD) for passive millimeter‐wave (PMMW) imaging systems. This technique has the ability to detect, classify and image hidden objects beneath the cloth of human targets. The algorithm was based on segmentation of normalized gray‐scale images for raw passive millimeter‐wave captured images and employing...
Notch antenna is constructed by slotting an edge of rectangular patch placed on a substrate over ground plane. Analysis of the notch antenna is complicated and very difficult due to having non-uniform shape. In this work, a novel formulation is proposed for calculating the resonant frequency of the notch antennas. The formulation regarding the resonant length of the antenna reflecting the impact of...
The millimetre wave (MW) applications has become very popular in recent years due to the high-resolution requirement in inverse synthetic aperture radar (ISAR) imaging. The most important problem encountered in MW imaging method is the high data collection requirement. Compressed sensing (CS) is often used in MW applications because it allows processing of signals with a sampling number below the...
One of the most important problems encountered in microwave imaging methods is intensive data processing traffic that occurs when high resolution and real time tracking is desired. Radar signals can be recovered without loss of data with a randomly selected subset of the measurement data by compression sensing (CS) method which has been popular in recent years. For this reason, in this study, the...
In this paper, it is aimed to design and realize a broad W-band and high sensitive waveguide detector module using a zero-bias schottky diode. The commercial off-the-shelf GaAs detector diode Aeroflex / Metelics MZBD-9161 is adopted to build a zero-bias direct detector, along with full band antipodal finline transition, microstrip line with DC microstrip blocker and low pass filter. This structure...
For dielectric materials being often utilized in quasi-optical components, the permittivity was evaluated by free-space method in W-band. The obtained permittivity value was applied to designing of low aberration large aperture aspheric dielectric lens and dielectric waveguide rod antenna. These components composed the antenna system for the passive radiometric imaging in 90–100 GHz frequency range...
In this study, a millimeter wave synthesizer operating between 69–71 GHz has been developed by TUBITAK Marmara Research Center using national sources for Josephson voltage standard (JGS) systems which is already developed at TUBITAK National Metrology Institute (NMI) Voltage Laboratory. Technical specifications of the synthesizer to be used in JGS and the developed synthesizer has been presented....
The detection of concealed objects like weapon, explosives, and other dangerous items became very important problem for defending people against terrorist attacks. Recent time, many methods have been developed but number of methods are not efficient to effectively solve this problem. The main aim of the research in this work is devoted to the detection of concealed dangerous objects by increasing...
In this study, the detection of metal objects concealed under clothes is investigated through millimeter-wave inverse synthetic aperture radar (ISAR) imaging. A metallic gun is selected as the target and W-band ISAR measurements for a two-dimensional scanning geometry are carried out in our anechoic chamber measurement facility. The ISAR images of concealed object are reconstructed using the near-field...
The study is devoted to the representation of the millimeter-wave imaging technologies of tomography, ISAR, SAR, and Passive Radiometric Radar (PRR) in International Laboratory for High Technologies (ILHT) of TUBĐTAK-Marmara Research Center (MRC). Millimeter-wave measurement setups with their technical descriptions are introduced as well millimeter-wave reconstructed images obtained by the usage of...
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