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检索条件"任意字段=Conference on Passive Millimeter-Wave Imaging Technology VI and Radar Sensor Technology VII"

共 55 条记录，以下是31-40 订阅

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Proceedings of SPIE: passive millimeter-wave imaging technology vi and radar sensor technology vii

Proceedings of SPIE: Passive Millimeter-Wave Imaging Technol...

引用

passive Milimeter - wave imaging technology vi and radar sensor technology vii

The proceeding contains 27 papers from the conference of SPIE: passive millimeter-wave imaging technology vi and radar sensor technology vii. The topics discussed include: passive millimeter-wave imaging for airborne and security applications;passive millimeter-wave imaging technology for phased-array systems;development of an illumination chamber for indoor millimeter-wave imaging;electronic scanning for passive millimeter-wave imaging;use of constraints in the superresolution of passive millimeter-wave images;a study of the effect of buried biomass on ground-penetrating radar performance;performance modeling of vote-based object recognition;and new approach to deinterleaving for radar intercept receivers.

关键词： millimeter wave devices

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passive millimeter-wave imaging for airborne and security applications

Passive millimeter-wave imaging for airborne and security ap...

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conference on passive millimeter-wave imaging technology vi and radar sensor technology vii

作者： Clark, SE Lovberg, JA Martin, CA Kolinko, V Trex Enterprises Corp San Diego CA 92121 USA

ISBN: (纸本)0819449369

As a result of its relatively short wavelength coupled with relatively high penetration of many materials, millimeter-wave imaging provides a powerful tool for the detection of concealed articles. By using a passive approach such as that implemented here, it is possible to image (detect) concealed weapons and articles or look through certain types of walls, all without generating any form of radiation that might raise health concerns. In this paper we will show images from our current first generation unit and discuss the technology and performance of the second generation state-of-the-art unit currently being built.

关键词： passive millimeter-wave imaging thermal imaging real-time imaging concealed object detection see through walls phase sorting

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Electronic scanning for passive millimetre wave imaging

Electronic scanning for passive millimetre wave imaging

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conference on passive millimeter-wave imaging technology vi and radar sensor technology vii

作者： Salmon, NA Hayward, S Walke, R Appleby, R QinetiQ Malvern WR14 3PS Worcs England

ISBN: (纸本)0819449369

This paper reviews the feasibility and requirements of scanning passive millimetre wave imaging systems based on the latest electronic technologies. The sensitivities, bandwidths and field-of-views of imaging radiometers are examined on the basis of large numbers (several hundreds) of distributed antennas and receivers. Transfer functions and point spread functions, of minimum redundant arrays for imaging, are calculated and the effects of phase stability assessed. Possible future directions of passive millimetre imaging, enabled by the storage of pre-detection radiometric data, are highlighted.

关键词： imaging millimetre passive radiometer digital beam-forming electronic scanning

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Development of an illumination chamber for indoor millimetre-wave imaging

Development of an illumination chamber for indoor millimetre...

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conference on passive millimeter-wave imaging technology vi and radar sensor technology vii

作者： Coward, P Appleby, R QinetiQ Malvern Worcs England

ISBN: (纸本)0819449369

passive millimetre-wave imaging provides the capability to detect objects concealed beneath clothing. In the past, this has been accomplished successfully outdoors, using the cold sky illumination to provide the majority of the scene contrast. However, many applications, such as airport security scanning, require a technology that can operate in an indoor environment. This paper describes work undertaken to develop a safe and effective illumination source for indoor millimetre-wave imaging. Results from a prototype real-time indoor millimetre-wave security scanner are presented, clearly showing hidden weapons, both metal and ceramic, and other objects.

关键词： concealed weapon detection millimetre-wave imaging illumination techniques

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Doppler-scatterometer for a sea surface and an atmospheric turbulence remote sensing

Doppler-scatterometer for a sea surface and an atmospheric t...

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conference on passive millimeter-wave imaging technology vi and radar sensor technology vii

作者： Arakelyan, AK Hambaryan, AK ANAS Inst Radiophys & Elect IRPhE Ashtarak 378410 Armenia

ISBN: (纸本)0819449369

In this paper a microwave Doppler-scatterometer system for a sea surface remote sensing, particularly for the determination of sea state and near surface wind speed, is presented. It is shown that there is a sense and a reason in such a system application for clear-air turbulence detection in atmospheric boundary layer, because the system allows simultaneously and by easy way to record amplitude and phase fluctuations of a radar signal reflected from turbulence.

关键词： radar Doppler effect Backscatter Turbulence Radon Polarization Remote sensing Scattering Atmospheric propagation Microwave radiation

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Land clutter statistical model for millimeter wave radar

Land clutter statistical model for millimeter wave radar

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conference on passive millimeter-wave imaging technology vi and radar sensor technology vii

作者： Kulemin, GP Natl Acad Sci Ukraine Inst Radiophys & Elect UA-61085 Kharkov Ukraine

ISBN: (纸本)0819449369

The main computation relations for determination o MMW radar land clutter statistical characteristics are analyzed. Expressions for normalized RCS determination of different surface types and polarization features of backscattering signals are discussed. Spatial and temporal statistical characteristics of the quadrature components and the amplitudes of scattered signals are analyzed;the influence of spatial characteristics of real land terrain on the quadrature component and amplitude distributions is discussed. It is shown that the amplitude pdf is approximated by the Weibull's law and the distribution of quadrature components is described by the compound Gaussian law. The spatial distributions for different terrain types are presented. As result, the algorithms for radar clutter modeling at millimeter band of radiowaves are obtained taking into consideration the spatial statistics of natural land surface.

关键词： land clutter model spatial and temporal statistics grazing angle

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passive millimeter-wave imaging technology for phased array systems

Passive millimeter-wave imaging technology for phased array ...

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conference on passive millimeter-wave imaging technology vi and radar sensor technology vii

作者： Martin, CA Clark, SE Lovberg, JA Kolinko, V Trex Enterprises Corp San Diego CA 92121 USA

ISBN: (纸本)0819449369

Trex Enterprises has developed a passive millimeter-wave imaging system incorporating a number of new technologies. The system has a pupil-plane architecture that uses a phased array, flat panel antenna and a phase processor based upon microwave optics. The production and operation of a 232-element W-band phased array and processor poses a number of technical problems including minimizing losses in the front end and adjusting the phase lengths of the processor. The system also has 192 frequency processor cards that perform real-time Fourier analysis of W-band signals over an 18 GHz bandwidth using millimeter-wave optics. Production of a suitable phase and frequency processor in large quantities that form good beams and maintain signal strength requires the adoption of new materials and design strategies. The refinement of these technologies at W-band frequencies allowed Trex Enterprises to produce an imager that is both compact and suitable for large-scale production. In this paper, we will discuss the design and production of the millimeter-wave components unique to this system architecture. We will also present the performance of these components and how they affect the performance of the millimeter-wave imager as a whole. An integrated front end is tested to determine the accuracy of the beam-forming network in producing antenna patterns.

关键词： millimeter-wave imaging passive imaging phased array processing staring array

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Influence of a strong radar reflector in the scene on the image formed by synthetic aperture radar using backprojection algorithm

Influence of a strong radar reflector in the scene on the im...

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conference on passive millimeter-wave imaging technology vi and radar sensor technology vii

作者： Khatri, H Ranney, K Nguyen, L USA Res Lab Adelphi MD 20783 USA

ISBN: (纸本)0819449369

When an image of an area on the ground is produced by applying a backprojection algorithm to data collected by a synthetic aperture radar with an ultra-wideband impulse waveform, image artifacts can occur due to any strong reflectors in the scene. These artifacts can obscure or influence the image of the area containing low-level reflectors that may be of interest. Herein, we examine the factors of the imaging geometry that leads to these artifacts or influences and propose a procedure for reducing them. We demonstrate the artifacts and the procedure to reduce them with the data collected by the ultra wideband radar of the U.S. Army Research Laboratory.

关键词： backprojection synthetic aperture radar artifacts

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Superresolution and coherent phenomena in multisensor systems of millimeter-wave radio imaging

Superresolution and coherent phenomena in multisensor system...

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conference on passive millimeter-wave imaging technology vi and radar sensor technology vii

作者： Pirogov, YA Gladun, VV Shlemin, IV Chzhen, SP Tischenko, DA Timanovskiy, AL Lebedev, AV Moscow MV Lomonosov State Univ Fac Phys Moscow 119899 Russia

ISBN: (纸本)0819449369

In this paper we consider some aspects of radiovision systems. At the beginning, we examine the coherent phenomena in multisensor systems, and what benefits have the systems based on this phenomena. Later we discuss the applications of calculated antenna pattern for, multi-channel radiovision system and show, that it can be used in some tasks if experimental one is not available. In the last section we consider superresolution methods, which allow to enhance resolution of the radio-thermal images obtained, and exceed the bounds of the Rayleigh limit. The results of several data processing series are provided.

关键词： multi-ray passive radio vision thermal imaging superresolution

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The impact of polarization and bandwidth on the performance of a real-aperture radar stationary detection algorithm

The impact of polarization and bandwidth on the performance ...

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conference on passive millimeter-wave imaging technology vi and radar sensor technology vii

作者： Tran, C Kirose, G Ranney, K USA Res Lab AMSRL SE RU Adelphi MD 20783 USA

ISBN: (纸本)0819449369

Detection of stationary targets with a real-aperture radar requires an algorithm that is a function of suitably defined features. The definition and values of these features are normally dependent on bandwidth, look-averaging, and polarization. Since the use of a fully polarimetric radar may not be feasible for low-cost radars on ground platforms, the goal of this effort is to investigate trade-offs between polarization and bandwidth. In this paper, we present prescreener and quadratic polynomial discriminator performance comparisons as a function of polarization, bandwidth, and look-averaging.

关键词： prescreener quadratic polynomial discriminator polarization bandwidth look-averaging

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