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检索条件"机构=Science and Technology on Near-Surface Detection Laboratory"

共 1092 条记录，以下是131-140 订阅

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The formation of high-resolution FMCW SAR video

The formation of high-resolution FMCW SAR video

引用

Progress in Electromagnetic Research Symposium (PIERS)

作者： Chengfei Gu Wenge Chang Xiangyang Li Xinqun Luan College of Electronic Science and Engineering National University of Defense Technology Changsha Hunan China Science and Technology on Near-Surface Detection Laboratory Wuxi Jiangsu China

In this paper, the formation of high-resolution FMCW SAR video is introduced in detail. With the application of rational design and compact devices, a miniaturized FMCW SAR prototype is successfully realized. Based on this high-performance FMCW SAR system, the continuous real-time video is achieved after the preprocessing of raw data, the parallel realization of extended FSA and the reprocessing of imaged data. Moreover, the time consuming of each procedure is accurately tested on the processing board of FMCW SAR system. In the end, several airborne experiments have been performed, and beneficial FMCW SAR video results have been obtained.

关键词： Synthetic aperture radar Streaming media Digital signal processing Imaging Azimuth Real-time systems Electromagnetics

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A compact air-coupled SFCW ground penetrating radar and its application in the earthen sites 20

A compact air-coupled SFCW ground penetrating radar and its ...

引用

20th International Conference on Ground Penetrating Radar, GPR, 2024

作者： Ye, Shengbo Li, Xu Li, Xinhui Liu, Xiaojun Fang, Guangyou Jiang, Hejun Lyu, Rongqi Aerospace Information Research Institute Chinese Academy of Sciences Beijing100190 China Key Laboratory of Electromagnetic Radiation and Sensing Technology Chinese Academy of Sciences Beijing100190 China School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences Beijing100049 China Science and Technology on Near-surface Detection Laboratory Wuxi214035 China

As a non-destructive testing technology, ground-penetrating radar (GPR) has been widely used in archaeological investigations of the earthen sites. Traditionally, a GPR antenna is ground-couple. It is attached to the measured object and thus may cause damage to the earthen sites. This paper develops a lightweight and compact air-coupled stepped frequency continuous waveform (SFCW) GPR system with frequency range from 1GHz up to 6GHz. We suppress the nonlinear variables of the radar system by calibration. And we perform tests on different weathering samples from the earthen sites. Our system is verified that can discriminate layered structures in samples and the results of tests are consistent with the simulations of the gprMax model. In general, this radar system can assess the weathering degree and provide technical support for the preservation of the earthen sites. © Published under licence by IOP Publishing Ltd.

关键词： Antenna grounds

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Camouflaged target tracking based on a scaleadaptive correlation filter algorithm

Camouflaged target tracking based on a scaleadaptive correla...

引用

Chinese Automation Congress (CAC)

作者： Yang Liu Congqing Wang Yongjun Zhou College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China Science and Technology on Near-Surface Detection Laboratory Wuxi China

ISBN: (数字)9781665426473

ISBN: (纸本)9781665426480

Considering the continuous development of intelligent technology and the wide application prospects of unmanned aerial vehicles (UAVs), the target tracking technology will be applied in future combat. In order to deal with the complex battlefield environment and the scale change of the target during tracking, an improved scale-adaptive correlation filter algorithm based on fusion features is proposed to realize the tracking of military personnel. First, the fast histogram of oriented gradient (FHOG) features and the local binary pattern (LBP) features are adaptively weighted and fused to achieve the target location. Then the translation filter of kernelized correlation filters(KCF) and the scale filter of discriminative scale space tracking(DSST) are combined to comprehensively improve the calculation speed and scale adaptation performance of the algorithm and track the target in time. The experimental results prove the robustness and practicability of the proposed method, which can accurately track military targets in real time.

关键词： Histograms Target tracking Correlation Automation Filtering algorithms Autonomous aerial vehicles Robustness

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Wide-beam Vivaldi Antenna

Wide-beam Vivaldi Antenna

引用

Progress in Electromagnetic Research Symposium (PIERS)

作者： Jinjing Ren Zhongyuan Yu Qi Tang Research Center for Electromagnetic Environmental Effects Southeast University Nanjing China Science and Technology on Near-surface Detection Laboratory Wuxi China

ISBN: (纸本)9781665409889

Vivaldi antenna has superior radiation performance and simple process, which can be used for common radar ranging. However, as a transmitting antenna, the Vivaldi antenna beam width is insufficient. In this paper, the traditional radiation structure of Vivaldi antenna is improved. A wide beam Vivaldi antenna based on elliptical slot structure is proposed, and the size is 150 mm×150 mm×1.6 mm, and FR4 is selected as the dielectric layer material. In the 2.5GHz-4GHz frequency range, the half-power beam width of the antenna reaches 90°, and the maximum reaches 128.3°. The gain is greater than 3.26 dBi and the directivity consistency is good. In the direction finding and ranging experiment, the antenna was used as the transmitting source of the transceiver system to measure the distance of metal objects. The ranging results are in high agreement with the actual results, indicating that the performance of the antenna is good.

关键词： Antenna measurements Simulation Vivaldi antennas Transmitting antennas Metals Directive antennas Transformers

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Full-polarimetric GPR for detecting ice fractures 17

Full-polarimetric GPR for detecting ice fractures

引用

17th International Conference on Ground Penetrating Radar, GPR 2018

作者： Luo, Chaopeng Feng, Xuan Liu, Cai Zhang, Yan Nilot, Enhedelihai Zhang, Minghe Dong, Zejun Zhou, Haoqiu Science and Technology Near-Surface Detection Laboratory China Key Laboratory of Geophysical Exploration Equipment Ministry of Education Jilin University No.938 Xi MinZhu Street Changchun130026 China College of Geo-exploration Science and Technology Jilin University No.938 Xi Minzhu Street Changchun130026 China College of Earth Sciences Jilin University Changchun130061 China

ISBN: (纸本)9781538657775

The real-time monitoring of ice fracture width and direction is of great significance for the safety of Antarctic scientific expedition and the understanding of the process of ice fracture induced by avalanches. Using full-polarimetric ground penetrating radar (GPR) system to detect ice cracks, the scattering matrix is obtained and processed by polarization decomposition. Compared with the traditional pulse radar, more comprehensive and more intuitive information of ice cracks can be obtained. By using the Pauli decomposition method in polarization decomposition, the forward data obtained by the three-dimensional finite difference time domain (FDTD) method is processed, and the applicability of the proposed decomposition method is proved. For testing the feasibility, we performed numerical and laboratory experiments and applied the Pauli decomposition to the GPR data for ice fracture characterization. On this basis, the method is used to imaging small scale ice cracks on the lake surface, and good results are achieved, which paves the way for further practical application. © 2018 IEEE.

关键词： Polarization

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Numerical Simulation of Subsurface Penetrating Radar in Isidis Planitia on Mars for China's First Mission to Mars 9

Numerical Simulation of Subsurface Penetrating Radar in Isid...

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9th International Conference on Environmental and Engineering Geophysics, ICEEG 2020

作者： Wang, Ying Feng, Xuan Liang, Wenjing Zhou, Haoqiu Dong, Zejun Li, Xiaotian Xue, Cewen College of Geo-Exploration Science and Technology Jilin University No.938 Xi Min Zhu Street Changchun China Science and Technology on Near-Surface Detection Laboratory Wuxi China Institute of National Development and Security Studies Jilin University No.2699 Qianjin Street Changchun China No.938 XiMin Zhu Street Changchun China

The water ice exploration mission is an important scientific target of China's first Mission to Mars. The high frequency full polarimetric subsurface penetrating radar (SPR) system onboard the landing rover can carry out high-resolution imaging of the near-surface area of Mars, which is an important tool for detecting the presence of shallow water ice and soil structure. At present, most of the radar detection simulations are based on low-frequency antennas to analyze the geological structure of Mars down to several kilometers, with low resolution, which is difficult to detect the subsurface structure in the near-surface accurately. Considering topographic relief, interface roughness, subsurface rock, water ice, and permittivity changes at different layers, a three-dimensional near-surface model in the Isidis Planitia on Mars is established. The interpretation of the forward simulation results is of reference value for future Mars exploration missions. © Published under licence by IOP Publishing Ltd.

关键词： Rovers

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Kinetics of first order magnetostructural transition in single crystalline FeRh thin film

Kinetics of first order magnetostructural transition in sing...

引用

International Conference on Magnetics (INTERMAG)

作者： W. Lu Y. Xu X. Fang Y. Song X. Li School of Materials Science and Engineering Tongji University Shanghai National Key Laboratory of Science Technology Near-surface Detection and Sensing Technology Wuxi University of Shanghai for Science and Technology Shanghai

This study reports the temperature- and time-dependent magnetization of the ferromagnetic phase in epitaxial FeRh thin films across the antiferromagnetic-ferromagnetic transition on both heating and cooling process by vibrating sample magnetometry. The thin films are deposited on MgO (001) substrates by co-evaporation method and vacuum annealed at 700 K for 2 h. X-ray diffraction is employed for structural characterization. Results from the magnetization curves indicate that the nucleation and growth behaviors of the single crystalline thin film are similar to crystallization of solids.

关键词： Magnetic hysteresis Magnetization Frequency modulation Temperature measurement Magnetic films Amorphous magnetic materials Magnetic fields

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Calibration of Interface Induced Polarization for Full Polarimetric Ground Penetrating Radar 9

Calibration of Interface Induced Polarization for Full Polar...

引用

9th International Conference on Environmental and Engineering Geophysics, ICEEG 2020

作者： Dong, Zejun Feng, Xuan Liu, Cai Liang, Wenjing Zhou, Haoqiu College of Geo-Exploration Science and Technology Jilin University No.938 Xi MinZhu Street Changchun China Institute of National Development and Security Studies Jilin University No.2699 Qianjin Street Changchun China Science and Technology on Near-Surface Detection Laboratory Wuxi China No.938 Xi MinZhu Street Changchun China

The traditional ground penetrating radar (GPR) uses only one type of antenna for data acquisition, and only obtains single polarization data of targets. It can not fully describe the various properties of the target. Full polarimetric GPR is a new technology that uses four different polarization antennas to measure the target and can receive electromagnetic waves of different polarized directions to describe the polarization effect of targets. However, when the plane electromagnetic wave propagates through the ground surface, the polarized direction will rotate, namely interface induced polarization (IIP), which results in the complex interference embedded in the full polarimetric GPR data. In this research, firstly we discuss the generation of the IIP;subsequently how the IIP affect the full polarimetric GPR data is derived;finally the calibration formula is proposed and is applied to the GPR data processing. © Published under licence by IOP Publishing Ltd.

关键词： Ground penetrating radar systems

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UAV-Borne Landmine detection via Intelligent Multispectral Fusion

UAV-Borne Landmine Detection via Intelligent Multispectral F...

引用

International Conference on Applied Machine Learning (ICAML)

作者： Hangfu Guo Hejun Jiang Jun Hu Chaopeng Luo School of Electronics and Communication Engineering Sun Yat-Sen University Shenzhen China Science and Technology on Near-Surface Detection Laboratory Wuxi China

Compared with traditional landmine detection methods, the unmanned aerial vehicle borne measure is more suitable for rapidly detecting large-area minefields of scatterable landmines. We propose a multispectral fusion strategy based on a deep learning model to facilitate landmine detection. With a UAV-borne multispectral cruise platform, we set up a multispectral dataset of scatterable landmines, where varieties of minefields with different ground vegetation environments are considered. The proposed technique includes a structure with adjustable weights to fulfill the fusion and refinement, and maximize the utilization of multispectral information. Experimental comparisons of the predictions before and after fusion demonstrate that our proposed fusion strategy can improve the recall rate and achieve significant gains over single-spectrum detection, especially for the occluded mines, and confirm the feasibility of the multispectral data with reasonable processing for the landmine detection.

关键词： Deep learning Landmine detection Annotations Geology Vegetation mapping Detectors Autonomous aerial vehicles

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ICERS:Intelligent Collaborative Emergency Response System 23

ICERS:Intelligent Collaborative Emergency Response System

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23rd International Conference on New Trends in Intelligent Software Methodologies, Tools and Techniques, SoMeT 2024

作者： Yang, Guoyin Zhang, Haotian Yao, Junfeng Cai, Chengyou Song, Jun Xu, Yuelin Deng, Bin School of Computer Engineer and Science Shanghai University Shanghai China The 32nd Research Institute of China Electronics Technology Group Corporation China CSSC Seago System Technology Co. Ltd. Shanghai200010 China Department of Geography Hong Kong Baptist University Hong Kong Science and Technology on Near-Surface Detection Laboratory Wuxi China

ISBN: (纸本)9781643685380

Advances in computer science and technology, coupled with the growing societal demand for enhanced safety, have paved the way for innovative smart home environments. While current smart home systems can send alarms and notify emergency contacts during a crisis, they do not provide timely and convenient on-site emergency assistance, potentially delaying critical aid and compromising user safety. This paper introduces the Intelligent Collaborative Emergency System (ICERS), which addresses this gap through three integrated subsystems: Fall detection, Vital Signs Monitoring, and Central Dispatch. The Fall detection module leverages camera video data to classify human positions and estimate potential falls. The Vital Signs Monitoring module employs millimeter-wave radar technology to provide non-contact, real-time health monitoring. The Central Dispatch system receives alert signals from on-edge devices and relays them to medical facilities and volunteer organizations for a coordinated emergency response. By utilizing multimodal data for collaborative efforts, the ICERS ensures that individuals receive timely notifications and coordinated emergency assistance during unforeseen situations. © 2024 IOS Press. All rights reserved.

关键词： Fall detection

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