检索结果-内蒙古大学图书馆

conference on radar sensor technology and data visualization

作者： Geisheimer, JL Greneker, EF Marshall, WS Georgia Tech Res Inst Radar Syst Div Sensors & Electromagnet Applicat Lab Smyrna GA 30080 USA

ISBN: (纸本)0819444944

A high resolution Doppler model of the walking human was developed for analyzing the continuous wave (CW) radar gait signature. data for twenty subjects were collected simultaneously using an infrared motion capture system along with a two channel 10.525 GHz CW radar. The motion capture system recorded three-dimensional coordinates of infrared markers placed on the body. These body marker coordinates were used as inputs to create the theoretical Doppler output using a model constructed in MATLAB. The outputs of the model are the simulated Doppler signals due to each of the major limbs and the thorax. An estimated radar cross section for each part of the body was assigned using the Lund & Browder chart of estimated body surface area. The resultant Doppler model was then compared with the actual recorded Doppler gait signature in the frequency domain using the spectrogram. Comparison of the two sets of data has revealed several identifiable bionrechanical features in the radar gait signature due to leg and body motion. The result of the research shows that a wealth of information can be unlocked from the radar gait signature, which may be useful in security and biometric applications.

关键词： radar human gait biometrics clinical gait analysis

来源：评论

学校读者我要写书评

暂无评论

Building the Visual Earth

Building the Visual Earth

引用

conference on radar sensor technology and data visualization

作者： Ribarsky, W Shaw, CD Wartell, Z Faust, N Georgia Inst Technol GVU Ctr Atlanta GA 30332 USA

ISBN: (纸本)0819444944

Over the past several years there has been a broad effort towards realizing the Digital Earth, which involves the digitization of all earth-related data and the organization of these data into common repositories for wide access. Recently the idea has been proposed to go beyond these first steps and produce a Visual Earth, where a main goal is a comprehensive visual query and data exploration system. Such a system could significantly widen access to Digital Earth data and improve its use. It could provide a common framework and a common picture for the disparate types of data available now and contemplated in the future. In particular much future data will stream in continuously from a variety of ubiquitous, online sensors, such as weather sensors, traffic sensors, pollution gauges, and many others. The Visual Earth will be especially suited to the organization and display of these dynamic data. This paper lays the foundation and discusses first efforts towards building the Visual Earth. It shows that the goal of interactive visualization requires consideration of the whole process including data organization, query, preparation for rendering, and display. Indeed, visual query offers a set of guiding principles for the integrated organization, retrieval, and presentation of all types of geospatial data. These include terrain elevation and imagery data, buildings and urban models, maps and geographic information, geologic features, land cover and vegetation, dynamic atmospheric phenomena, and other types of data.

关键词： real-time visualization NEXRAD data Doppler radar visualization global geospatial hierarchy VGIS

来源：评论

学校读者我要写书评

暂无评论

The use of passive radar for mapping lightning channels in a thunderstorm

The use of passive radar for mapping lightning channels in a...

引用

conference on radar sensor technology and data visualization

作者： Greneker, EF Geisheimer, JL Georgia Tech Res Inst Radar Syst Div Sensores & Electromagnet Applicat Lab Smyra GA 30080 USA

ISBN: (纸本)0819444944

Researchers at the Severe Storms Research Center (SSRC), Georgia Institute of technology are attempting to detect tornado formation within severe thunderstorms occurring within the vicinity of Atlanta, Georgia using Doppler radar and non-radar sensors that may provide early tornado warning. The goal of these studies is to increase the warning time of tornado formation within the parent thunderstorm. Currently, GTRI researchers use real time S-band Doppler weather radar data from three National Weather Service (NWS) WSR-88D NEXRAD radars displayed on a work station developed and optimized for tornado detection by the National Severe Storms Laboratory (NSSL). Three NWS radars provide severe weather surveillance coverage of the north Georgia area to determine if a thunderstorm contains the Doppler signature that indicates tornado formation. There is also the capability to display cloud to ground (CG) lightning strikes provided by a national monitoring network. The symbology indicating CG strike location is imposed on the radar reflectivity map. GTRI also uses a local lightning direction finder (DF) system that supplies azimuth and range to the lightning strike. This paper discusses the early lightning channel research and the passive parasitic radar system being operated by the SSRC. Lightning detection tests are also presented.

关键词： Severe storms weather radar lightning channel detection

来源：评论

学校读者我要写书评

暂无评论

Modeling targets in a forest at VHF and UHF frequencies

Modeling targets in a forest at VHF and UHF frequencies

引用

conference on radar sensor technology and data visualization

作者： Sullivan, A USA Res Lab Adelphi MD 20783 USA

ISBN: (纸本)0819444944

The utility of low frequency synthetic aperture radar (SAR) for detecting foliage-concealed targets is examined. A forest simulation has been created using a large set of randomly placed and oriented tree models over a lossy dielectric halfspace. Given the size of the targets and the wideband frequencies of interest, it is shown that the problem size quickly grows beyond the capabilities of even supercomputers. As a. result, an approximate linear superposition technique is developed to model the response from a large number of targets (T-72 tank plus forest model). Results in the SAR image domain show that the clutter response produced by the collection of trees is higher than the response from the T-72 in all cases except when the tank orientation is broadside to the radar aperture. Examination of the backscattered signature of the T-72 shows that there is a direct correlation between the target response and the physical layout of the vehicle. This connection between shape and response holds promise for future exploitation in ATR algorithm development.

关键词： radar ultra-wideband foliage penetration method of moments

来源：评论

学校读者我要写书评

暂无评论

Ground penetrating radar signal processing techniques for airfield evaluations

Ground penetrating radar signal processing techniques for ai...

引用

conference on radar sensor technology and data visualization

作者： Meloy, JH Overman, CH Kurtz, JL Porter, JR Greene, JH Univ Florida Elect Commun Lab Gainesville FL 32614 USA

ISBN: (纸本)0819444944

The University of Florida, Electronic Communications Laboratory (ECL), as part of a project with the Air Force Research Laboratory (AFRL), is investigating the utility of ground penetrating radar (GPR) for airfield evaluations. It is expected that the GPR and the results of current research will assist the Air Force in assessing airfields with less coring and allow more rapid and accurate airfield evaluations by providing continuous estimates of the pavement and subsurface conditions. AFRL has conducted airfield measurements using a high-resolution GPR mounted on a test van. Using time domain data from a pair of ground-coupled antennas, one in bistatic mode and the other in monostatic mode, the thickness of pavement and other subsurface layers can be estimated. In order for GPR to be useful for airfield evaluations, practical considerations such as automated data processing capability and efficient data analysis procedures have also been addressed. This paper will describe novel approaches and signal processing techniques developed for detecting layer interface boundaries and estimating the layer properties using GPR. In addition, the software tools developed to. facilitate airfield evaluations will be discussed. Finally, surface layer thickness estimates will be compared to measured cores from a recent airfield assessment.

关键词： ground penetrating radar radar signal processing radar detection

来源：评论

学校读者我要写书评

暂无评论

Hybrid 3D laser sensor based on a high-performance long-range widefield-of-view laser scanner and a calibrated high-resolution digital camera

Hybrid 3D laser sensor based on a high-performance long-rang...

引用

conference on Laser radar technology and Applications IX

作者： Ullrich, A Studnicka, N Riegl, J RIEGL Laser Measurement Systems GmbH (Austria)

ISBN: (纸本)0819453358

We present a hybrid sensor consisting of a high-performance 3D imaging laser sensor and a high-resolution digital camera. The laser sensor uses the time-of-flight principle based on near-infrared pulses. We demonstrate the performance capabilities of the system by presenting example data and we describe the software package used for data acquisition, data merging and visualization. The advantages of using both, near range photogrammetry and laser scanning, for data registration and data extraction are discussed.

关键词： laser scanning photogrammetry 3D data post-processing

来源：评论

学校读者我要写书评

暂无评论

Measurements of atmospheric turbulence with an X-band radar: correlation with angle-of-arrival results

Measurements of atmospheric turbulence with an X-band radar:...

引用

conference on radar sensor technology and data visualization

作者： Holder, EJ Kerce, JC Smith, RA Shipman, MA McMillan, RW Williams, J Georgia Inst Technol Georgia Tech Res Inst Atlanta GA 30332 USA

ISBN: (纸本)0819444944

We report on measurements of the index of refraction structure parameter C-n(2) using an X-band interferometric radar operating over a 3.5 kin path in Southern California. These measurements were made by observing signal fluctuations and relating them to the structure parameter. Simultaneous measurements of temperature, atmospheric pressure, and humidity were made at the end points of the range. Values of C-n(2) ranging from 1.4 X 10(-15) to 6.3 X 10(-15) m(-2/3) were observed over a propagation path that was up to 275 m above ground level. These values are generally much larger than those that would be observed at visible wavelengths under the same conditions because of the contributions of the humidity structure parameter and the cross correlation of the temperature and humidity structure parameters. We also address correlation of these measurements of C-n(2) with fluctuations in the radar angle-of-arrival.

关键词： radar Humidity X band Geometrical optics Atmospheric turbulence Interferometry Refraction Antennas Microwave radiation Transmitters

来源：评论

学校读者我要写书评

暂无评论

Real-time 3D visualization of Phased Array Weather radar data via Concurrent Processing in Science Cloud 7

Real-time 3D Visualization of Phased Array Weather Radar Dat...

引用

7th IEEE Annual Information technology, Electronics and Mobile Communication conference (IEEE IEMCON)

作者： Murata, Ken T. Muranaga, Kazuya Yamamoto, Kazunori Nagaya, Yoshiaki Pavarangkoon, Praphan Satoh, Shinsuke Mizuhara, Takamichi Kimura, Eizen Tatebe, Osamu Tanaka, Masahiro Kawahara, Shintaro Natl Inst Informat & Commun Technol Tokyo Japan Syst Engn Consultants Co Ltd Tokyo Japan CLEALINKTECHNOLOGY Co Ltd Kyoto Japan Ehime Univ Dept Med Informat Ehime Japan Univ Tsukuba Fac Engn Informat & Syst Tsukuba Ibaraki Japan Japan Agcy Marine Earth Sci & Technol Yokohama Kanagawa Japan

ISBN: (纸本)9781509009961

With the tremendous development of remote sensing technologies, a large amount of observation data are generated from sensors. Since each sensor generates data periodically, e.g., every minute, a concurrent data processing using a cloud system plays an important role in the modern design process. This paper focuses on concurrent data processing techniques for an X-band phased array weather radar ( PAWR) using high-speed network, parallel data processing system, and large-scale storage system. The PAWR at National Institute of Information and Communications technology (NICT), Japan rotates in 30 sec to capture a 3D structure of rainfalls within 60 km in radius and 15 km in altitude. In this paper, we develop a real-time 3D visualization system of the observation data of the PAWR. Our visualization is carried out from 54 sec to 69 sec ( depending on the weather conditions) after every observation period, which is in the same time scale with other conventional 2D visualization of X-band weather radars. In addition, we discuss a combination of cloud ecosystems for the concurrent processing at low cost. The methodology is considered as a pioneering case study to develop of a variety real-time data processing systems of big data via remote sensing.

关键词： X-band weather radar phased array weather radar science cloud real-time visualization 3D visualization concurrent processing ecosystem

来源：评论

学校读者我要写书评

暂无评论

A general-purpose electronic warfare system test configuration data model

A general-purpose electronic warfare system test configurati...

引用

conference on radar sensor technology and data visualization

作者： Viverito, VJ Georgia Tech Res Inst Elect Syst Lab Atlanta GA 30318 USA

ISBN: (纸本)0819444944

Electronic Warfare Systems tests, whether performed in the lab or on the range, require extensive configuration of the test equipment, all attributes of which must be stored for later data reduction and analysis. Many tests require similar configurations;it would therefore be useful if general-purpose configuration templates could be built once then reused whenever necessary. In this paper, a data model is developed which stores complex EW-system test configurations. Configurations may be reused at multiple levels. Should new kinds of data be required in the future, the model is extensible. Equally important, the model can be pared down in uncomplicated configuration situations. Finally, less frustration during data reduction and analysis would occur since the model facilitates straightforward data entry. Software that reduces data gleaned from EW-system tests may use this model both to develop databases for configuration storage and as part of the internal model of the reduction software itself.

关键词： UML data model database EW testing

来源：评论

学校读者我要写书评

暂无评论

Robotic Inspection and Subsurface Defect Mapping Using Impact-Echo and Ground Penetrating radar

引用

IEEE ROBOTICS AND AUTOMATION LETTERS 2023年第8期8卷 4943-4950页

作者： Hoxha, Ejup Feng, Jinglun Sanakov, Diar Xiao, Jizhong CUNY City Coll EE Dept New York NY 10031 USA NYU Mech Engn Dept New York NY 11201 USA

Concrete infrastructure often develops a variety of internal flaws that cannot be detected through visual inspection alone, and must be regularly inspected with other methods to maintain structural integrity. It has been demonstrated through previous studies that relying solely on a single non-destructive evaluation (NDE) method can be insufficient in providing a comprehensive evaluation of the structure's condition. In addition, manual NDE data collection can be labor-intensive for on-site engineers. This paper presents a robotic inspection system that uses vision-based positioning and tags NDE measurement with pose information to reveal and map subsurface defects. The system consists of three modules: 1) an Omni-directional robotic data collection platform equipped with a Realsense D435i camera for localization, an impact-echo (IE) sensor, and a ground penetrating radar (GPR), to perform automatic NDE data collection;2) an IE data processing module that utilizes both learning-based and classical methods to interpret the IE data and reveal subsurface objects;3) a GPR data processing module to reconstruct underground targets and create a 3D map for better visualization. Field testing demonstrates that the robotic system significantly increases the data collection speed, and the correlation of findings from both IE and GPR sensors give a comprehensive evaluation of concrete structures that will benefit the inspection and maintenance industry of civil infrastructure.

关键词： Robotics and automation in construction sensor-based control sensor fusion

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：