Millimeter wave Imaging System

Shilo, S.A.; Sidorenko, Yu. V.

doi:10.1109/msmw.2007.4294695

Cited by 2 publications

(1 citation statement)

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“…However, poor spatial resolution limits the stand-off ranges for mmw imaging in CTD applications [6]. Mmw cameras further suffer from a low frame rates due to the very low intensity of passive thermal mmw emission and a limited field of view because the very high cost of mmw receivers makes an array of mmw receivers prohibitively expensive; most commercial mmw cameras rely on mechanical scanning of reflective optics although there are some different approaches which circumvent some of these problems [7], [8].…”

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confidence: 99%

Active Millimeter Wave Sensor for Standoff Concealed Threat Detection

et al. 2013

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We present a millimeter radar for threat level evaluation developed for the detection concealed threats, such as guns and person borne improvised explosive devices (PBIED). The system uses a Gaussian optic lens antenna to achieve standoff ranges up to 25 m. Ultra-wideband swept frequency radar, using direct detection receivers, is implemented to achieve short radar range resolution (< 10 mm). The system is capable of detecting a wide range of objects positioned in front of the body by interpretation of the scattered waveform. Threat detection is rendered autonomously by a neural network that processes the scattered polarimetric, depth domain radar waveforms. The system may be configured to alarm or reject certain classes of objects, allowing for the detection of specific or broad spectrum threats. The radar system is portable and manually steered by the operator to enable standoff monitoring of walking human targets in real time. A video feed provides the operator with a wide field of view that allows tracking of persons and greatly facilitates aiming of the sensor. Rapid (1 ms) radar sweep times and fast signal acquisition and processing are implemented to provide threat detection at video frame rates (30 fps). Performance parameters for the detection of hand-guns and simulated PBIED are presented for ranges up to 25 m.

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Active Millimeter Wave Sensor for Standoff Concealed Threat Detection

et al. 2013

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Passive millimetre-wave imaging with a planar diffraction antenna

Harmer

Shylob

Sydorenkob

et al. 2014

2014 9th International Symposium on Communication Systems, Networks &Amp; Digital Sign (CSNDSP)

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A dispersive antenna, formed by locating a dielectric sheet waveguide in the near-field zone of a millimetric scale diffraction grating, is described for the application of passive millimeter-wave imaging in the W-band. Two dimensional radiometric contrast images are formed by frequency scanning in the radial direction of the image and mechanically scanning in the azimuthal direction. Mechanical scanning is by means of rotation of the antenna at a uniform angular speed, while frequency scanning is achieved by careful selection of antenna parameters to provide a near linear dependence of beam angular position with frequency of ~ 1 degree per GHz. The imaging system operates over the frequency range 84-100 GHz and utilizes a single millimeter-wave LNA (Low Noise Amplifier) and mixer to produce a microwave frequency intermediate frequency; further down conversion stages result in 64 baseband channels. In this way, the 16 GHz operational bandwidth is divided into 64 equal width frequency channels, giving the system a field of view of ~ 16 degrees.

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Millimeter wave Imaging System

Cited by 2 publications

References 1 publication

Active Millimeter Wave Sensor for Standoff Concealed Threat Detection

Active Millimeter Wave Sensor for Standoff Concealed Threat Detection

Passive millimetre-wave imaging with a planar diffraction antenna

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