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

共 57 条记录，以下是11-20 订阅

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Concealed weapons detection with an improved passive millimeter-wave imager

Concealed weapons detection with an improved passive millime...

引用

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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Low-cost position-adaptive UAV radar design with state-of-the-art COTS technology

Low-cost position-adaptive UAV radar design with state-of-th...

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Conference on radar sensor technology viiI and passive Millimeter-wave imaging technology vii

作者： Mitra, AK Pasala, KM USAF Res Lab SNRR Wright Patterson AFB OH 45433 USA

ISBN: (纸本)0819453331

A COTS-based design for a monostatic position-adaptive radar concept is presented. The development and design effort is focused on a test experiment where a onboard radar-based instrumentation system allows a mini-UAV helicopter to hover back and forth in front of two large (side-by-side) "building-type" structures. Under this concept, the "smart" or "robotic" mini-UAV helicopter "position-adaptively" converges to a location between the two "building-type" structures in order to interrogate an object-of-interest that may be located between these "building-type" structures. Design issues with regard to major sub-systems and interfaces between these subsystems are discussed. Applications for this type of system include intelligence gathering from indoor and outdoor urban environments and underground facilities via deployment a tier of position-adaptive mini-UAV's.

关键词： position-adaptive radar mini-UAV helicopter ultra-wideband radar broadband antenna design robotics

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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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A methodology for characterizing phase noise in modulated radar waveforms: An alternative 'terrain' characterization method

A methodology for characterizing phase noise in modulated ra...

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Conference on radar sensor technology viiI and passive Millimeter-wave imaging technology vii

作者： Gray, JE Addison, SR USN Ctr Surface Warfare Dahlgren Div Dahlgren VA 22448 USA

ISBN: (纸本)0819453331

The problem of modulated noise first arose in Lord Rayleigh's investigations of acoustical backscatter off of rough sea surfaces. The same problem occurs in radar when the electromagnetic waveform takes an indirect return or transmit path to a scatterer (target) and then is received as a noise corrupted signal at the radar receiver. The effect is to produce modulated noise on the return signal. While most texts have a tendency to model the effect of noise as purely additive, it is more properly modeled as modulated noise. Recent work by the authors allow one to statistically characterize the effect of modulated noise on the received signal. This has some implications for phenomenology on being able to characterize radar backscatter from land, sea, weather as well as the implications for improved signal processing.

关键词： phase noise scattering modulated waveforms

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Inverse synthetic aperture radar imagery of man with a rocket propelled grenade launcher

Inverse synthetic aperture radar imagery of man with a rocke...

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Conference on radar sensor technology viiI and passive Millimeter-wave imaging technology vii

作者： Tran, C Innocenti, R Kirose, G USA Res Lab AMSRL SERU Adelphi MD 20783 USA

ISBN: (纸本)0819453331

As the Army moves toward more lightly armored Future Combat System (FCS) vehicles. enemy personnel will present an increasing threat to U.S. soldiers. In particular, they face a very real threat from adversaries using shoulder-launched, rocket propelled grenade (RPG). The Army Research Laboratory has utilized its Aberdeen Proving Ground (APG) turntable facility to collect very high resolution, fully polarimetric Ka band radar data at low depression angles of a man holding an RPG. In this paper, we examine the resulting low resolution and high resolution range profiles;and based on the observed radar cross section (RCS) value, we attempt to determine the utility of Ka band radar for detecting enemy personnel carrying RPG launchers.

关键词： ISAR man with RPG launcher RCS Ka band

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Spatial statistical characteristics of land and development of radar clutter maps

Spatial statistical characteristics of land and development ...

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Conference on radar sensor technology viiI and passive Millimeter-wave imaging technology vii

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

ISBN: (纸本)0819453331

Land spatial statistical characteristics obtained experimentally and from the topographical maps are analyzed. It is shown that the probability density function of backscattered. signal is determined by the temporal fluctuations and the spatial fluctuations because of scattered areas replacement. The experimental spatial statistical characteristics of micro-scale roughness (rms height, the slope distributions, and autocorrelation functions) are presented. It was shown that for mathematical description of surface for different fields it is better to use the fractal process. The spatial statistics of land backscattering for surfaces without vegetation is determined by the distributions of surface local slopes. The roughness height and slope distributions for different terrain types are presented that are obtained from electronic topographical maps. The method of clutter map development is analyzed, it is shown its great dependence on radar and target heights.

关键词： spatial statistical characteristics clutter map land statistics fractal model

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Constrained image restoration for use in passive mm-wave imaging

Constrained image restoration for use in passive mm-wave ima...

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Conference on radar sensor technology viiI and passive Millimeter-wave imaging technology vii

作者： Lettington, AH Alexander, NE Boukouvala, E Univ Reading Reading RG6 6AF Berks England

ISBN: (纸本)0819453331

passive millimeter-wave imaging has excellent all weather capability but requires large apertures to give adequate spatial resolution. Linear restoration can enhance the resolution by a factor of two, while under favorable conditions non-linear restoration can enhance it by a factor of four. The amount of enhancement possible is generally limited by the amount of noise present in the original observed image. Preprocessing can reduce the effect of this noise and the image may be selectively restored. The high spatial frequency content of an image exists largely at edges and sharp features and these may be restored using non-linear restoration techniques. The smoother background between these features contains fewer high frequencies and needs less restoration. Adaptive non-linear restoration techniques have been investigated whereby the amount of restoration applied to an image is a function of the first and second derivative of the image intensity. In many non-linear restoration techniques the amount of high spatial frequency content introduced into the restored image is uncontrolled. This problem has been overcome through the use of the Lorentzian algorithm. which imposes a statistical constraint on the distribution of gradients within the restored image. Recently attempts have been made to explain why the distribution of gradients within an image is Lorentzian in terms of randomly distributed gradients of random size. Images are presented to demonstrate the effectiveness of these methods.

关键词： image restoration superresolution constrained restoration mm-wave imaging

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passive position-adaptive radar modes for non-LOS interrogation of embedded targets

Passive position-adaptive radar modes for non-LOS interrogat...

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Conference on radar sensor technology viiI and passive Millimeter-wave imaging technology vii

作者： Mitra, AK USAF Res Lab SNRR Wright Patterson AFB OH 45433 USA

ISBN: (纸本)0819453331

A position-adaptive radar system concept is presented for purposes of interrogating difficult and obscured targets via the application of low-altitude smart or robotic-type UAV platforms. Under this concept, a high-altitude radiating platform is denoted as a HUAV and a low-altitude "position-adaptive" platform is denoted as a LUAV. The system concept is described by two modes. In Mode-1, real-time onboard LUAV computation of a phase parameter denoted as "signal differential path length" allows the LUAV to position-adaptively isolate a "signal leakage point", for example, between two buildings. After the LUAV position-adaptively converges to an optimum location, the system enters Mode-2. Under this Mode-2 concept, a technique denoted as "exploitation of leakage signals via path trajectory diversity" (E-LS-PTD) is developed. This technique is based on modulating scattering centers on embedded objects by implementing a fast trajectory on the HUAV while the LUAV is hovering in front of an obscuration channel." Analytical results include sample outputs from an initial set numerical electromagnetic simulations.

关键词： position-adaptive radar systems analysis electromagnetic modeling and simulation

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Design and development of a high performance passive mm-wave imager for aeronautical applications

Design and development of a high performance passive mm-wave...

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Conference on radar sensor technology viiI and passive Millimeter-wave imaging technology vii

作者： Lettington, AH Dunn, D Alexander, NE Wabby, A Lyons, BN Doyle, R Walshe, J Attia, M Blankson, I Univ Reading Reading RG6 6AF Berks England

ISBN: (纸本)0819453331

This paper describes a high performance opto-mechanically scanned mm-wave imager intended to monitor the ground movement of aircraft in adverse weather conditions. It employs two counter-rotating mirrors that are tilted about their axes of rotation. They simulate the linear scan of a single high speed, large aperture flapping mirror. When used with a linear receiver array they can produce a two-dimensional scan of the scene at TV rates. In the present application they were used with a single receiver and a large flapping mirror to produce a two-dimensional scan of the scene of +/-10degrees vertically and 60degrees horizontally. One of the rotating mirrors had a concave surface and acted as the focusing element in the imager. The two mirrors were driven from a single servo motor using timing belts and toothed pulleys. The flapping mirror was slaved to the motion of the rotating discs using an electronic cam. The single channel 94GHz receiver consisted of an InP LNA followed by a down-converter and a detector. The video output passed to an A/D converter and was displayed on a conventional PC. This system has virtually 100% transmission and can be used at any waveband.

关键词： passive millimeter-wave imaging PMMW scanning

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A portfolio of fine resolution SAR images

A portfolio of fine resolution SAR images

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Conference on radar sensor technology viiI and passive Millimeter-wave imaging technology vii

作者： Doerry, AW Gutierrez, VD Wells, L Sandia Natl Labs Livermore CA 94550 USA

ISBN: (纸本)0819453331

Sandia National Laboratories designs and builds Synthetic Aperture radar (SAR) systems capable of forming high-quality exceptionally fine resolution images. Resolutions as fine as 4 inches (10 cm) in both slant range and azimuth are routinely formed in real time on board Sandia's DeHavilland DHC-6 Twin Otter aircraft using a Ku-band SAR. Resolutions as fine as 6 inches (15 cm) in both slant range and azimuth are routinely formed using an X-band SAR. Careful system design allows high image quality as measured by nearly ideal Impulse Response (IPR) shapes, with typical Multiplicative Noise Ratios (MNR) of better than 20 dB, and a noise equivalent reflectivity usually better than -30 dB. Collection geometries routinely include squint angles 45 degrees both fore and aft of broadside, on either side of the aircraft. This paper offers a collection of high quality images representative of the output of Sandia's testbed radar. High-quality fine-resolution images of a variety of target scenes will be displayed, with annotation describing relevant image parameters.

关键词： SAP radar image

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