Due to the enormous advances made in semiconductor technology over last few years, high integration densities with moderate costs are achievable even millimeter-wave (mm-wave) range and beyond, which encourage development of imaging systems a number channels. The mm-wave lies between 30 300 GHz, corresponding wavelengths 10 1 mm. While objects signals millimeters wavelength, many optically opaque appear transparent, making attractive for wide variety commercial scientific applications like...

This paper presents a multiple-input-multiple-output imaging system on the basis of hybrid concept with synthetic aperture radar and digital beam forming. By moving multistatic linear array perpendicularly to dimension, 2-D is sampled. The scope application concealed weapon detection in conjunction humans and, alternatively, nondestructive testing (NDT). frequency range 75-90 GHz was chosen because inherent high lateral resolution. For NDT, it seems be good compromise between resolution...

Active imaging systems for security screening at the airport or other checkpoints have proven to offer good results. Present require a specific position and posture,¹³ movement² of passenger in front system. Walk Through Systems (WTS) which screen while passing system hallway would be more pleasant result great improvement throughput. Furthermore detection performance could enhanced since possible threats are visible from different perspectives tracked within frames....

The paper presents the development of a fast scanning W-Band (75-100 GHz) system and suitable antenna concept for advanced imaging applications. goal is to obtain broadband frequency response from large target area within short time period. Two typical approaches design free space millimetre-wave setup will be discussed. first approach consists focused bistatic measurement that includes combination conical horn dielectric lens in order focus beam. basic idea second use an unfocused employing...

Stepped-frequency continuous-wave (SFCW) radar systems with real-time capability can utilize only a moderate number of frequency points to achieve high sweep rate. Thus, range ambiguities clutter become crucial because possible obscuration the target response. An optimized nonuniform SFCW concept is introduced reduce maximum ambiguity level. This applied an active multistatic imaging system for personnel screening. The design improves system's robustness against due reflections from...

Reliable and convenient walk-through security scanning, which doesn't separate people or impede their movement, is an extremely challenging task. In this paper, a novel approach for check with overhead observation polarimetric target decomposition presented. The viewing angle of the scanner equals side-looking airborne radar. However, it will be shown that established methods remote-sensing are not well suited close-range radar imaging need to adapted due differences in geometry scenario....

This paper presents the concept of a Ka-Band (26.5 - 40 GHz) multistatic active short range imaging system. The motivation for this work was development fast scanning system non destructive testing (NDT) or security scenarios. goal to derive 3D reconstruction device under test (DUT). consists linear receive array and spatially distributed transmitters with focussing antenna elements. transmit/receive is moved perpendicular dimension. By switching between each transmitter simultaneous...

This paper presents the development of a W-band short range imaging system for security and non-destructive testing applications, which uses an unfocused measurement setup employing SAR algorithms in order to focus image numerically. The active offers possibility get broadband frequency response from each pixel plane. For real-time applications fast scanning, monostatic virtual antenna concept has been developed optimized. is demonstrated two different configurations, on one hand using...

In the classical indirect holographic setup, a wave emitted by measurement object is superimposed with reference at aperture of imaging system. The resulting interference pattern can be recorded simple intensity detection. However, complex field obtained from plane spectrum (PWS) pattern. Dedicated methods used to calculate distribution position, which equivalent properties and an image object, respectively. This paper shows that resolution created constricted due fact bandwidth extracted...

Active imaging systems in the millimeter wave region have proven to offer good results for security applications. Especially a coherent signal detection high dynamic range. Several techniques and were published last years. The drawback of an active illumination measurement object is effect shading poor illuminated areas due specular reflections from smooth surfaces. visibility depends on its surface roughness relative positioning sensor. personnel screening, human skin behaves as mirror...

This paper presents the demonstrator of a fully polarimetric ultra-wideband (UWB) multistatic imaging system for screening groups walking people in public areas. The is working FCC UWB frequency band from 3.6 GHz to 10.6 GHz. low range chosen reduce influence and clutter clothes minimum. important places because scanner needs identify threats even under thick heavy jackets with false alarm rate. Furthermore, effect motion blurring reconstructed radar images enormously reduced. To further...

Microwave security screening systems detect threats based on reconstructed radar images. Hence, aiming for the best possible reconstruction results is main target every personnel system. We introduce in this paper a computationally efficient imaging algorithm, that improves walk-through scanner notably by using an additional depth camera. To achieve this, body parts of passing human are automatically detected and tracked recorded frames. The determined trajectory then used to create inverse...