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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1-10 订阅

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The implementation of compressive sensing on an FPGA for chaotic radars 19

The implementation of compressive sensing on an FPGA for cha...

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conference on radar sensor technology XIX and Active and passive Signatures vi

作者： Ochoa, Hector A. Hoe, David H. Veeramachaneni, Dinesh Univ Texas Tyler Tyler TX 75799 USA Loyola Univ Maryland Baltimore MD 21210 USA

ISBN: (纸本)9781628415773

Most of the advances in current radar systems are aimed at improving their resolution. As a result, their operating frequency has been increased from 10GHz up to 94GHz, and new millimeter-wave (100-300GHz) radar systems are currently being studied. One of the major concerns with these frequencies is the associated large bandwidth requirement. Compressive Sensing (CS), also known as Compressive Sampling, has been proposed as a solution to overcome the aforementioned problems by exploiting the sparsity of the radar signal. Using the CS method, a sparse signal can be reconstructed even if it is sampled below the Nyquist rate. This method provides a completely new way to reconstruct the signal using optimization techniques and a minimum number of observations. The objective of this research project is to investigate and develop a Chaotic radar imaging system that leverages Compressive Sensing (CS) technology to improve the image resolution without increasing the amount of processed data. In addition to demonstrating the validity of the proposed approach through simulations, this project seeks to develop and implement hardware prototypes for the proposed imaging radar system. Simulated chaotic radar data was generated and loaded to the FPGA board to test the algorithms and their performance. The results from implementing the Orthogonal Matching Pursuit (OMP), the Compressive Sensing Matching Pursuit (CSMP), and the Stagewise Orthogonal Matching Pursuit (StOMP) algorithms to a Xilinx ZedBoard will be presented.

关键词： Chaotic radar Compressive Sensing Matched Filter FPGA OMP StOMP CSMP

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

Proceedings of SPIE - Radar Sensor Technology VIII and Passi...

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radar sensor technology viiI and passive millimeter-wave imaging technology vii

The proceedings contain 34 papers from the conference on SPIE: radar sensor technology - wave imaging technology vii. The topics discussed include: a SAR imaging model for large-scale atmospheric inhomogeneities;a portfolio of fine-resolution SAR images;resolution issues in the analysis of radar signals vs fourier approaches;detecting slow moving targets in SAR images;a methodology for characterizing phase noise in modulated radar waveforms: an alternative 'terrain' characterization method and polarimetric scene simulation in millimeter-wave radiometric imaging.

关键词： Synthetic aperture radar

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On spatial resolution of quasi-optical focal plane antenna array imagers

On spatial resolution of quasi-optical focal plane antenna a...

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

作者： Volkov, LV Voronko, AI Volkova, NL Russian Acad Sci Inst Radioengn & Elect Fryazino 141196 Moscow Region Russia

ISBN: (纸本)0819453331

The spatial resolution of millimeter wave (MMW), submillimeter wave (SMMW) and infrared (IR) quasi-optical imagers based on the usage of focal plane antenna arrays (FPAA) is limited by several common factors. Analytical expressions for the point spread functions (PSF) of FPAA imagers are derived for both coherent and spatially incoherent imaging. The possibility of developing advanced super-resolution imaging algorithms using PSFs determined to a high accuracy is discussed.

关键词： active and passive MMW imaging focal plane antenna array point spreadfuriction antenna pattern super-resolution

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Superresolution in the passive radiovision systems of millimeter wave range

Superresolution in the passive radiovision systems of millim...

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

作者： Pirogov, YA Gladun, VV Tischenko, DA Timanovskiy, AL Moscow MV Lomonosov State Univ Fac Phys Moscow 119992 Russia

ISBN: (纸本)0819453331

In this paper we present the overview of problems and difficulties, which are common in passive radiovision. The central part of the article is dedicated to mathematical resolution enhancement methods - superresolution. We consider several algorithms and discuss benefits and drawbacks they have. Performance of the algorithms is demonstraited using a set of test images, both simulated and real-life. Such advanced questions as subpixeling technique and artifact suppression using the wavelet transform are also reflected in the paper. The illustrations are included in order to demonstrate significant improvement of the resolution along with artifact suppression achieved on real-life observed images.

关键词： multichannel passive radiovision thermal imaging superresolution

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Research on antenna scanning mode and image displaying method of 8mm ground radiometric imaging system

Research on antenna scanning mode and image displaying metho...

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

作者： Gui, LQ Guo, W Zhang, ZY Huazhong Univ Sci & Technol Key lab Educ Minist Image Proc & Intelligent Control Wuhan 430074 Hubei Peoples R China

ISBN: (纸本)0819453331

The antenna scanning modes and the image displaying methods used in a millimeter wave radiometric imaging system have great influence on its imaging quality. In order to obtain high quality millimeter wave radiometric images, intensive studies are needed. This paper describes the antenna scanning mode and the image displaying method of 8mm Ground Radiometric imaging System (GRIS) and compares two different image displaying methods. The experimental results prove the rotating whole antenna concial scanning mode and unequal size element arc displaying method fits GRIS better.

关键词： imaging system millimeter wave radiometer image displaying

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A SAR imaging model for large-scale atmospheric inhomogeneities

A SAR imaging model for large-scale atmospheric inhomogeneit...

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

作者： Dickey, FM DeLaurentis, JM Doerry, AW Sandia Natl Labs Albuquerque NM 87185 USA

ISBN: (纸本)0819453331

This paper addresses anomalies that occasionally appear in SAR images. The cause is assumed to be atmospheric inhomogeneities. The atmospheric effect is small and should be more noticeable at longer ranges. A first order model of the SAR image formation process is developed. This model predicts secondary effects in the image that are not directly observed. The secondary effects are attributed to coupling between the image and frequency (data) space.

关键词： synthetic aperture radar SAP image anomalies atmospheric effects

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Compact mm-wave medical imager

Compact mm-wave medical imager

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

作者： Robertson, DA Univ St Andrews Sch Phys & Astron Photon Innovat Ctr St Andrews KY16 9SS Fife Scotland

ISBN: (纸本)0819453331

A mm-wave imager has been developed for medical applications and will be reported here. It uses a single-channel mechanically scanned heterodyne radiometer and diffraction-limited focussing optics to achieve high resolution images of subcutaneous body temperature. The particular design constraints imposed by close-range operation (tens of centimetres) will be discussed. The instrument uses a novel, patented method for regular calibration of both the thermal and spatial response of the imager. Results obtained from healthy volunteers will also be presented.

关键词： passive millimetre wave imaging medical imaging radiometry calibration Gaussian beams

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Concealed weapons detection with an improved passive millimeter-wave imager

Concealed weapons detection with an improved passive millime...

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

作者： Martin, CA Kolinko, VG Trex Enterprises Corp San Diego CA 92121 USA

ISBN: (纸本)0819453331

Trex Enterprises has developed a second-generation passive millimeter-wave imaging system for detection of concealed weapons and explosives at standoff ranges. passive millimeter-wave sensors form an image from naturally emitted blackbody radiation in the millimeter-wave portion of the electromagnetic spectrum. Radiation at this wavelength passes through most types of clothing, allowing the user to acquire an image of any articles on a suspect's person that differ significantly from the human body in their reflectivity or radiometric temperature at millimeter-wave wavelengths. Trex Enterprises previously demonstrated a first-generation concealed weapon detection system with the ability to detect handguns and knives under heavy clothing at a range of 27'. The second-generation imager, while similar in concept, has an improved field-of-view and a much reduced size and weight. The imager is to be put through a battery of tests by both Trex Enterprises and the National Institute Of Justice to determine its ability to detect both metallic and non-metallic knives and handguns as well as various types of explosive devices. The tests will be conducted indoors and outdoors at various ranges.

关键词： concealed weapons millimeter-wave radiometer explosives detection non-metallic weapons stand-off range

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passive millimeter-wave focal plane array

Passive millimeter-wave focal plane array

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

作者： Middleton, C Zummo, G Weeks, A Pergande, A Mirth, L Borernan, G Univ Cent Florida CREOL Sch Opt Orlando FL 32816 USA

ISBN: (纸本)0819453331

We built and tested a low-cost 8-by-8 millimeter-wave focal plane array using antenna-coupled micro-bolometers. The array consists of slot antennas coupled to nickel bolometers and was fabricated using optical lithography on high-resistivity silicon wafers. The measured noise equivalent temperature difference (NETD) of an individual element was 450 K. Simulation results corresponded with observed device performance. An improved design was then implemented using a square spiral antenna. We discuss the fabrication of this type of array element, include some modeling results, and present the methods and results of our measurements.

关键词： Antennas Bolometers Nickel Silicon Chemical elements Resistance Staring arrays Etching Optical lithography Temperature metrology

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Active millimeter-wave video rate imaging with a staring 120-element microbolometer array

Active millimeter-wave video rate imaging with a staring 120...

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

作者： Luukanen, A Miller, AJ Grossman, EN Natl Inst Stand & Technol Quantum Elect Metrol Div Boulder CO 80305 USA

ISBN: (纸本)0819453331

passive indoors imaging of weapons concealed under clothing poses a formidable challenge for millimeter-wave imagers due to the sub-picowatt signal levels present in the scene. Moreover, video-rate imaging requires a large number of pixels, which leads to a very complex and expensive front end for the imager. To meet the concealed weapons detection challenge, our approach uses a low cost pulsed-noise source as an illuminator and an array of room-temperature antenna-coupled microbolometers as the detectors. The reflected millimeter-wave power is detected by the bolometers, gated, integrated and amplified by audio-frequency amplifiers, and after digitization, displayed in real time on a PC display. We present recently acquired videos obtained with the 120-element array, and comprehensively describe the performance characteristics of the array in terms of sensitivity, optical efficiency, uniformity and spatial resolution. Our results show that active imaging with antenna-coupled microbolometers can yield imagery comparable to that obtained with systems using MMIC amplifiers but with a cost per pixel that is orders of magnitude lower.

关键词： bolometer array millimeter-wave terahertz concealed weapons imaging

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