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检索条件"任意字段=Conference on Radar Sensor Technology II"

共 103 条记录，以下是11-20 订阅

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Airborne short-wave radar gauging of underground water level, snow layer depth and ice covering thickness

Airborne short-wave radar gauging of underground water level...

引用

conference on radar sensor technology ii

作者： Garnakeryan, AA Garmatiouk, DS Lobatch, VT Lobatch, YV Taganrog State Univ. of Radioengineering (Russia) Univ. of South Carolina (United States)

ISBN: (纸本)0819424811

radar sensing of multi-layer structures deserves particular attention in the respect of practical applications in agriculture, geophysics, etc. Subsurface radar means allow to increase the value of geologic surveillance. Transferring from sensing homogeneous layers with small losses to sensing structures with great attenuation of signal demands lowering of the frequency of emitted signal. The article considers a method of sensing underground waters, snow and ice layers with frequencies of 20..150 MHz. Coherent and incoherent components of backscattered RF signal's power and envelope variation ratio are regarded the sources of information about the thickness of a layer.

关键词： airborne remote sensing coherent and incoherent components of backscattered signal layer thickness

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Detection algorithms for ultra-wideband foliage penetration radar

Detection algorithms for ultra-wideband foliage penetration ...

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conference on radar sensor technology ii

作者： Nguyen, L Kapoor, R Sichina, J Army Research Lab. (United States)

ISBN: (纸本)0819424811

Army Research Laboratory (ARL), as part of its mission-funded exploratory development program, has been evaluating the use of a low-frequency, ultra-wideband (UWB) imaging radar to detect tactical vehicles concealed by foliage. An instrumentation-grade measurement system has been designed and implemented by ARL. Extensive testing of this radar over the preceding 18 months has led to the establishment of a significant and unique data base of radar imagery. We are currently using these data to develop target detection algorithms which can aid an operator in separating vehicles of interest from background. This paper provides early findings from the algorithm development effort. To date, our efforts have concentrated on identifying computationally simple strategies for canvassing large areas for likely target occurrences-i.e., prescreening of the imagery. Phenomenologically-sound features are being evaluated for discrimination capability. Performance assessments, in terms of receiver operating characteristics (ROC), detail detection capabilities at various false alarm rates.

关键词： ultra wideband radar SAR automatic target detection

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Correction of artifacts in turntable inverse synthetic aperture radar images

Correction of artifacts in turntable inverse synthetic apert...

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conference on radar sensor technology ii

作者： Showman, GA Sangston, KJ Richards, MA Georgia Tech Research Institute (United States)

ISBN: (纸本)0819424811

Inverse synthetic aperture radar (ISAR) imaging on a turntable-tower test range permits convenient generation of high resolution two- and three-dimensional images of radar targets under controlled conditions, typically for characterization of the radar cross section of targets or for testing SAR image processing and automatic target recognition algorithms. However, turntable ISAR images suffer geometric distortions and zero-Doppler clutter (ZDC) artifacts not found in airborne SAR images. In this paper, ISAR images formed at Georgia Tech's Electromagnetic Test Facility are used to demonstrate and compare selected members of one family of two-dimensional ISAR imaging algorithms, from a simple but distortion-prone 2D discrete Fourier transform (DFT) to a computationally-intensive matched filter solution. A simple algorithm for correcting range curvature using image domain resampling is described. We then demonstrate two signal processing techniques to suppress zero-Doppler clutter while minimizing effects on the target signature. The first removes ZDC components in the frequency domain, whereas the second performs cancellation in the image domain.

关键词： inverse synthetic aperture radar ISAR turntable radar cross section clutter suppression clutter filtering

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SAR target feature extraction using the 2-D continuous wavelet transform

SAR target feature extraction using the 2-D continuous wavel...

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conference on radar sensor technology ii

作者： Kaplan, LM Murenzi, R Clark Atlanta Univ. (United States)

ISBN: (纸本)0819424811

In this paper, we introduce the 2-D continuous wavelet transform (CWT) as a tool for the detection stages of an SAR ATR system. We demonstrate that the 2-D CWT tuned to reasonable target sixes can enhance the signal to clutter ratio (SCR) and improve detection performance in a focus of attention (FOA) algorithm as compared to the traditional CFAR algorithm. We also show that the 2-D CWT can be used to estimate the sire and pose of a target, which can provide important features for second level detection. The detection and feature extraction algorithms were tested on measured one foot resolution SAR data.

关键词： automatic target recognition synthetic aperture radar target detection wavelets

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ATR via coregistration of visual-thermal-range (VTR) augmented radar images

ATR via coregistration of visual-thermal-range (VTR) augment...

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conference on radar sensor technology ii

作者： PerezJacome, JE Madisetti, VK Georgia Institute of Technology (United States)

ISBN: (纸本)0819424811

A method to automatically detect targets from sets of pixel-registered visual. thermal, and range (VTR) images is outlined. It uses operations specifically designed to work on the different kinds of images to explote the information given by each of them. Five features are used to distinguish the targets from the clutter: texture, brightness, temperature, surface planarity, and height. We describe two different schemes. The first one involves logically combining the results of individual detectors with binary detection information as output. A morphological operation called ''erosion of strength n'' is introduced and utilized as a powerful tool for removal of spurious information. The second scheme utilizes the concept of ''images of interest'' to combine the information provided by the different images. A simple linear combination of these images yields excellent detection results. The success of this scheme supports its suitability for other ATR (Automatic Target Recognition) problems.

关键词： ATR multisensor thermal range visual detection coregistred image interest

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New law enforcement applications of millimeter wave radar

New law enforcement applications of millimeter wave radar

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conference on radar sensor technology ii

作者： Currie, NC Ferris, DD McMillan, RW Wicks, MC Georgia Tech Research Institute (United States) Rome Lab. (United States)

ISBN: (纸本)0819424811

Recent advances in millimeter-wave (MMW) radar technologies provide new applications for law enforcement use over-and-above the venerable speed timing radar. These applications include the potential to detect weapons under clothing and to conduct surveillance through walls. Concealed Weapon Detection (CWD) and covert surveillance are of high interest to both the Department of Defense in support of Small Unit Operations (SUO) and the Justice Department for civilian law enforcement applications. MMW sensors are under development which should provide the needed capabilities including radiometric sensors at 95 GHz, active 95 GHz real aperture radars, active focal plane array (FPA) radars, and holographic radars. Radiometric sensors include 2-D FPA systems, 1-D FPA, scanned systems, and single element scanned sensors. Active FPA radars include illuminated radiometric systems and coherent radar systems. Real aperture MMW radar systems include raster scanned and conical scanned sensors. Holographic systems ruse mechanical scanners to collect coherent data over a significant solid angular sector.

关键词： concealed weapon detection through-the-wall surveillance millimeter wave radar

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Bistatic VHF and UHFSAR for urban environments

Bistatic VHF and UHFSAR for urban environments

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conference on radar sensor technology XI

作者： Rasmusson, Johan R. Blom, Martin Flood, Bjorn Frolind, Per-Olov Gustavsson, Anders Jonsson, Tommy Larsson, Bjorn Stenstrom, Gunnar Ulander, Lars M. H. FOI Swedish Def Res Agcy Dept Radar Syst POB 1165 SE-58111 Linkoping Sweden

ISBN: (纸本)9780819466693

Bistatic synthetic aperture radar (SAR) enables new defense as well as environmental applications where the characteristics of the bistatic reflectivity can be exploited. Experimental results obtained with microwave systems have been reported but not much is published using lower frequencies (< IGHz). FOI has been active in this part of the electromagnetic spectrum for many years with the development and operation of two airborne SAR sensors, i.e. CARABAS-ii (20-90 MHz) and more recently LORA (200-800 MHz). During 2006 experimental work was initiated to investigate the challenges of implementing a bistatic low frequency SAR system. Various synchronization tests were made in the lab as a preparation for the first bistatic VHF SAR data registrations. An area in the vicinity of Linkoping city was illuminated using CARABAS-ii as the airborne transmitter and the LORA radar electronics as a stationary roof-top mounted receiver unit. The latter was reconfigured to be able to handle the frequency interval 20-90 MHz. The approximately 4.1 kin by 4.1 kin large common radar scene contains urban environments, open areas and forested parts. The CARABAS-ii sensor simultaneously registered monostatic SAR data to facilitate the image interpretation by comparisons although the incidence angle on receive differs considerably.

关键词： bistatic imaging mapping SAR synthetic aperture radar urban VHF UHF

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Synthetic aperture radar processing using a non-uniform pulse repetition interval

Synthetic aperture radar processing using a non-uniform puls...

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conference on radar sensor technology ii

作者： Mobley, SG Maier, MW U.S. Army Missile Command (United States) Univ. of Alabama in Huntsville (United States)

ISBN: (纸本)0819424811

Due to recent development of the theory related to non-uniform Pulse Repetition Intervals (PRI) for pulse doppler radars, it has become feasible to combine the multiple pulse integration of Synthetic Aperture radar (SAR) with the temporal agility of non-uniform PRI's. This combination can bring to the traditional SAR system the benefits of both strong resistance to countermeasures and interception, and high sensitivity. A significant problem which much be addressed in synthetic aperture radars is the possible smearing of the azimuth dimension of the image due to doppler sidelobes which are too high. This issue is even more serious with a non-uniform PRI waveform. In a traditional SAR the sidelobes are controlled with signal processing techniques such as amplitude weighting. However, these simpler techniques are not adequate for non-uniform PRI waveforms, One method for increasing the sidelobe rejection capability of these waveforms requires the use of a processor which consists of time varying linear digital filters. One way to design such a filter is through the use of interpolation based techniques.

关键词： synthetic aperture radar non-uniform pulse repetition interval interpolation

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Ultra-wideband signal radiation

Ultra-wideband signal radiation

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conference on radar sensor technology VI

作者： Immoreev, ii Sinyavin, AN Taylor, JD Moscow Inst Aviat Technol Moscow 125871 Russia

ISBN: (纸本)0819440698

A systematic theory for estimating ultra-wideband (UWB) antenna parameters and performance is not yet published. Because the radiation of short duration signals is significantly different from the long duration narrowband signals, we analyzed the processes in linear antennas and give a physical interpretation. We considered a series excited antenna modeled as one branch of a symmetrical radiator of length L, and having a large number of elementary radiators of size DeltaL. By examining the radiation from each element DeltaL, we can sum the results and provide a far field estimate at different angles from the antenna axis. The result shows the field is a function of time and angular position from the antenna, instead of position, as in the narrowband case. For a given radiator size L, the radiation becomes axial for small values of cr. As tau increases for a constant length, the pattern becomes normal to the antenna axis.

关键词： Antennas Electromagnetism Signal processing Chromium Gaussian pulse Radio propagation Estimation theory Free space Signal analyzers radar

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A portfolio of fine resolution Ku-band miniSAR Images: part ii

A portfolio of fine resolution Ku-band miniSAR Images: part ...

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conference on radar sensor technology X

作者： Sweet, A. D. Dubbert, D. F. Doerry, A. W. Sloan, G. R. Gutierrez, V. Dee Sandia Natl Labs POB 5800MS 0519 Albuquerque NM 87185 USA

ISBN: (纸本)0819462667

Sandia-developed SAR systems are well known for their real-time, high quality, high resolution imagery. Recently, a series of tests were completed with the sub-thirty pound, Ku-band miniSAR system. A large data set was collected including real-time images of a variety of target scenes with resolutions as fine as 4 inches. This paper offers a sampling of real-time, high quality, fine resolution images representative of the output of Sandia's miniSAR radar. Images will be annotated with descriptions of collection geometries and other relevant image parameters. The miniSAR system and Sandia DeHaviland DHC-6 Twin Otter test bed are also briefly discussed.

关键词： SAR miniaturized radar image fine resolution

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