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

共 52 条记录，以下是11-20 订阅

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Emulation of Forward-Looking radar technology for Threat Detection in Rough Terrain Environments: A Scattering and Imaging Study

Emulation of Forward-Looking Radar Technology for Threat Det...

引用

conference on radar sensor technology xvii

作者： Liao, DaHan Dogaru, Traian US Army Res Lab Adelphi MD USA

ISBN: (纸本)9780819495051

Large-scale, full-wave modeling of multistatic target imaging in a rough ground environment is described. The emulation methodology employs a parallelized three-dimensional "near-field" finite-difference time-domain algorithm in characterizing the electromagnetic scattering from the ground surface and buried and on-surface targets in the form of landmines and unexploded ordnances;subsequent focusing of the scattered fields into an image is obtained with the time-reversal technique. The emphasis of this study is on investigating the detectability of discrete ground targets in the presence of distributed variable ground clutter as relevant to performance prediction for ultra-wideband forward-looking radar applications.

关键词： Computational electromagnetics finite-difference time-domain method forward-looking radar ground surface electromagnetic scattering landmine detection multistatic radar imaging time-reversal imaging

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Three-Dimensional radar Imaging of Buildings Based on Computer Models

Three-Dimensional Radar Imaging of Buildings Based on Comput...

引用

conference on radar sensor technology xvii

作者： Dogaru, Traian Liao, DaHan Le, Calvin US Army Res Lab Adelphi MD 20783 USA

ISBN: (纸本)9780819495051

This paper describes the study of a through-the-wall radar system for three-dimensional (3-D) building imaging, based on computer simulations. Two possible configurations are considered, corresponding to an airborne spotlight and a ground-based strip-map geometry. The paper details all the steps involved in this analysis: creating the computational meshes, calculating the radar signals scattered by the target, forming the radar images, and processing the images for visualization and interpretation. Particular attention is given to the scattering phenomenology and its dependence on the system geometry. The images are created via the backprojection algorithm and further processed using a constant false-alarm rate (CFAR) detector. We discuss methods of 3-D image visualization and interpretation of the results.

关键词： Sensing through-the-wall radar synthetic aperture radar computational electromagnetics

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Tomographic imaging with ultra-wideband noise radar using time-domain data

Tomographic imaging with ultra-wideband noise radar using ti...

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conference on radar sensor technology xvii

作者： Shin, Hee Jung Narayanan, Ram M. Rangaswamy, Muralidhar Penn State Univ University Pk PA 16802 USA Air Force Res Lab Wright Patterson AFB OH 45433 USA

ISBN: (纸本)9780819495051

This paper investigates the feasibility of using a noise waveform in an ultra-wideband (UWB) radar system for two-dimensional tomographic imaging of a stationary object with a multistatic tomographic geometry. Multiple UWB transmitters and receivers are positioned along each side of the imaging area. We perform several numerical simulations in time-domain, and the successful imaging of the target is achieved by visual inspection of the formed images.

关键词： Tomographic imaging back projection imaging ultra-wideband noise radar system

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Robust adaptive beamforming for MIMO monopulse radar

Robust adaptive beamforming for MIMO monopulse radar

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conference on radar sensor technology xvii

作者： Rowe, William Strom, Marie Li, Jian Stoica, Petre Univ Florida Dept Elect & Comp Engn Gainesville FL 32611 USA Chalmers Univ Technol Gothenburg Sweden Uppsala Univ Uppsala Sweden

ISBN: (纸本)9780819495051

Researchers have recently proposed a widely separated multiple-input multiple-output (MIMO) radar using monopulse angle estimation techniques for target tracking. The widely separated antennas provide improved tracking performance by mitigating complex target radar cross-section fades and angle scintillation. An adaptive array is necessary in this paradigm because the direct path from any transmitter could act as a jammer at a receiver. When the target-free covariance matrix is not available, it is critical to include robustness into the adaptive beamformer weights. This work explores methods of robust adaptive monopulse beamforming techniques for MIMO tracking radar.

关键词： Phased arrays radar Receivers Transmitters Antennas Error analysis Monte Carlo methods Neodymium Scintillation Signal to noise ratio

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Micro-Range Micro-Doppler for Dismount Classification

Micro-Range Micro-Doppler for Dismount Classification

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conference on radar sensor technology xvii

作者： Tahmoush, Dave US Army Res Lab Adelphi MD USA

ISBN: (纸本)9780819495051

This paper presents a processing technique that can be used to detect and classify pedestrians group based on the micro-Doppler signature gathered with a millimeter wave radar. The evaluation of the number of pedestrians moving in a group can be a difficult task using a traditional micro-Doppler spectrogram because of a tendency for people to partially synchronize their steps when walking together. The new approach, based on multi-range variation as well as the micro-Doppler variations, provides promising results. The range-spectrogram processing technique was developed and tested using a database composed of hundreds of pedestrian and vehicle signatures gathered in an urban test site over a two year period in a variety of weather conditions. We associate image detections with radar detections through motion extracted from both radar and imagery. We also explain how radar and video together can produce an inexpensive alternative to 3-D imaging.

关键词： Classification micro-Doppler surveillance radar

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Platform for Research and Education on Ground Penetrating radar

Platform for Research and Education on Ground Penetrating Ra...

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conference on radar sensor technology xvii

作者： Salvador, M. J. Jimenez, V. Lopez, R. G. von Borries, R. Univ Texas El Paso El Paso TX 79968 USA

ISBN: (纸本)9780819495051

Current commercial Ground Penetrating radar (GPR) systems are found at a high cost and allow little interaction between the user and the system. This paper presents a low cost and flexible GPR platform attractive for use in education and research based on the Universal Software Radio Peripheral (USRP) developed by Ettus Research. A software application developed in Labview enables users to select and modify fundamental parameters of the transmission and reception stages of a GPR system. Users are able to modify parameters such as sampling and carrier frequencies, waveform shape, amplitude, and bandwidth. The programmability of the USRP in conjunction with the developed software tools provides a user-friendly GPR platform.

关键词： Ground penetrating radar software radio Vivaldi antenna

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Initial experimental results using the noise correlation radar

Initial experimental results using the noise correlation rad...

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conference on radar sensor technology xvii

作者： Govoni, Mark A. Silvious, Jerry Clark, John Overman, Charles US Army CERDEC Div Radar Aberdeen Proving Ground MD 21005 USA U S Army Res Lab Adelphi MD 20783 USA Univ Florida Gainesville FL 32611 USA

ISBN: (纸本)9780819495051

Experimental results from recent field testing with the noise correlation radar (NCR) are presented as a proof of concept. In order to understand the effectiveness of the NCR, a pre-determined set of measures is established. We discuss the three experimental configurations used in evaluating the system's range resolution/error, robustness to interference, and secure radio frequency (RF) emission. We show that the advanced pulse compression noise (APCN) radar waveform has low range measurement error, is robust to interference, and is spectrally non-deterministic. In addition, we determine that an improvement in range resolution due to phase modulation is achieved as a function of the random code length rather than the compressed pulse length.

关键词： noise correlation radar advanced pulse compression noise spectrum interference

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Micro-Doppler and vibrometry at millimeter and sub-millimeter wavelengths

Micro-Doppler and vibrometry at millimeter and sub-millimete...

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conference on radar sensor technology xvii

作者： Robertson, Duncan A. Cassidy, Scott L. Univ St Andrews SUPA Sch Phys & Astron St Andrews KY16 9SS Fife Scotland

ISBN: (纸本)9780819495051

Micro-Doppler is an emerging technique for the measurement and analysis of target modulation characteristics, rooted in the analysis of X-band radar measurements of people. Despite the advantage of higher Doppler sensitivity, there appears to be little such work reported at (sub-) millimeter wave frequencies. We have developed fully coherent, solid state, FMCW radar systems operating at 94 and 340 GHz, suitable for micro-Doppler and vibrometry studies (as well as SAR/ISAR), which make use of DDS chirp generation combined with upconversion and MMIC or Schottky diode frequency multiplication. Due to the low phase noise architecture, the phase (i.e. displacement) sensitivity can be below 1 micron in distance.

关键词： radar micro-Doppler vibrometry millimeter wave sub-millimeter phase noise

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Buried target radar imaging with an ultra-wideband, vehicle-mounted antenna array

Buried target radar imaging with an ultra-wideband, vehicle-...

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conference on radar sensor technology xvii

作者： Ranney, Kenneth Liao, DaHan Dogaru, Traian Tran, Chi Lam Nguyen US Army Res Lab Adelphi MD 20783 USA

ISBN: (纸本)9780819495051

The problem of detecting buried objects has engaged radar system developers for quite some time. Many systems-both experimental and commercial-have been developed, including vehicle-mounted systems that look beneath road surfaces. Most of these downward-looking systems exploit multiple transmit and receive channels to enhance resolution in the final radar imagery used for target detection. In such a system, the configuration and operation of the various transmit and receive elements play a critical role in the quality of the output imagery. In what follows, we leverage high-fidelity electromagnetic model data to examine a multistatic downward-looking radar system. We evaluate the signatures produced by various targets of interest and describe, both qualitatively and quantitatively, the variations in target signatures produced by different system configurations. Finally, we analyze the underlying physics of the problem to explain certain characteristics in the observed target signatures.

关键词： Multi-static imaging forward looking radar ground penetrating radar downward-looking radar

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Riemannian Mean and Space-Time Adaptive Processing Using Projection and Inversion Algorithms

Riemannian Mean and Space-Time Adaptive Processing Using Pro...

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conference on radar sensor technology xvii

作者： Balaji, Bhashyam Barbaresco, Frederic Def Res & Dev Canada Ottawa Radar Sensing & Exploitat Sect 3701 Carling Ave Ottawa ON K1A 0Z4 Canada Thales Air Syst F-91470 Limours France

ISBN: (纸本)9780819495051

The estimation of the covariance matrix from real data is required in the application of space-time adaptive processing (STAP) to an airborne ground moving target indication (GMTI) radar. A natural approach to estimation of the covariance matrix that is based on the information geometry has been proposed. In this paper, the output of the Riemannian mean is used in inversion and projection algorithms. It is found that the projection class of algorithms can yield very significant gains, even when the gains due to inversion-based algorithms are marginal over standard algorithms. The performance of the projection class of algorithms does not appear to be overly sensitive to the projected subspace dimension.

关键词： R iemannian geometry Karcher barycenter STAP

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