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探地雷达在隧道检测中的应用 被引量:3
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作者 梅本荣 蒋宣艳 《黑龙江交通科技》 2014年第5期86-86,共1页
随着科技的进步,探地雷达由于具有低成本、高精度、高效等特点,已成为隧道基础工程设施无损检测技术的重要组成部分。结合工程实例分析了探地雷达在隧道检测中的应用情况。
关键词 探地雷 达隧道检测 应用
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探地雷达-电法-化探技术在地下排污管网探测工程中的应用 被引量:1
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作者 李玉道 王基成 《石油化工环境保护》 2002年第1期48-51,共4页
介绍探地雷达
关键词 地下排污管网 测工程 探地雷达-电法-化技术 排污管网 废水处理 炼油厂
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某市地下管线探测 被引量:1
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作者 韩语言 陈小刚 +5 位作者 胡善庭 张俊杰 赵清先 谢一锋 严钦渝 胡中瑜 《价值工程》 2015年第8期305-306,共2页
本文将从国内外城市对地下管线管理现状的分析入手,结合某市地下管线探测工程,全面论述了地下管线探测的原理、方法和技术。重点论述了电磁波法、地质雷达探测法。以某市燃气输气管检测和供水管网的检测为背景,论述管线探测方法在燃气... 本文将从国内外城市对地下管线管理现状的分析入手,结合某市地下管线探测工程,全面论述了地下管线探测的原理、方法和技术。重点论述了电磁波法、地质雷达探测法。以某市燃气输气管检测和供水管网的检测为背景,论述管线探测方法在燃气管道检测方法、技术、要求和内容。 展开更多
关键词 地下管线 电磁波法 探地雷打法
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高速公路试验检测技术的应用分析
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作者 申海 王俊锋 《中国科技期刊数据库 工业A》 2024年第6期0024-0027,共4页
近年来,高速公路建设取得了显著的成就,总里程数位居世界前列,而打造更高品质的高速公路工程,是目前重要的工程建设目标。通过合理运用高速公路试验检测技术,严格检测工程建设期的原材料和关键工程部分,确保工程如期保质交付极为重要。... 近年来,高速公路建设取得了显著的成就,总里程数位居世界前列,而打造更高品质的高速公路工程,是目前重要的工程建设目标。通过合理运用高速公路试验检测技术,严格检测工程建设期的原材料和关键工程部分,确保工程如期保质交付极为重要。但高速公路建设周期长且规模较大,存在诸多的试验检测类目,其实施工单位充分把握关键试验检测内容,合理运用相应的检测技术,保证检测结果的精准度,为公路工程建设提供有效助力。本文将重点剖析试验检测技术的应用情况,以供参考。 展开更多
关键词 高速公路 试验检测技术 压实度 路面弯沉 探地雷法检测
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基于支持向量机和竞争学习的图像配准方法
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作者 张菁 郭茂祖 刘群 《哈尔滨工业大学学报》 EI CAS CSCD 北大核心 2007年第7期1114-1116,共3页
为了使探测到的各种地雷图像更清晰,要求将金属地雷探测器和雷达渗透地面探测器的图像用图像精确配准的方法将二者的图像融合.提出了基于竞争学习和支持向量机的图像配准方法.该方法是用竞争学习的权值标明地雷边缘点,以获得图像中地雷... 为了使探测到的各种地雷图像更清晰,要求将金属地雷探测器和雷达渗透地面探测器的图像用图像精确配准的方法将二者的图像融合.提出了基于竞争学习和支持向量机的图像配准方法.该方法是用竞争学习的权值标明地雷边缘点,以获得图像中地雷的特征值;然后用支持向量机反复匹配两个待配准图像的支持向量.融合图像信息熵的测定结果表明,基于竞争学习和支持向量机的图像配准方法融合图像携带的信息量大,融合图像质量高,图像配准精确. 展开更多
关键词 图像配准 竞争学习 支持向量机 金属地雷测器 探地雷地雷测器
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Recursive impedance inversion of ground-penetrating radar data in stochastic media 被引量:6
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作者 曾昭发 陈雄 +3 位作者 李静 陈玲娜 鹿琪 刘凤山 《Applied Geophysics》 SCIE CSCD 2015年第4期615-625,630,共12页
The travel time and amplitude of ground-penetrating radar (GPR) waves are closely related to medium parameters such as water content, porosity, and dielectric permittivity. However, conventional estimation methods, ... The travel time and amplitude of ground-penetrating radar (GPR) waves are closely related to medium parameters such as water content, porosity, and dielectric permittivity. However, conventional estimation methods, which are mostly based on wave velocity, are not suitable for real complex media because of limited resolution. Impedance inversion uses the reflection coefficient of radar waves to directly calculate GPR impedance and other parameters of subsurface media. We construct a 3D multiscale stochastic medium model and use the mixed Gaussian and exponential autocorrelation function to describe the distribution of parameters in real subsurface media. We introduce an elliptical Gaussian function to describe local random anomalies. The tapering function is also introduced to reduce calculation errors caused by the numerical simulation of discrete grids. We derive the impedance inversion workflow and test the calculation precision in complex media. Finally, we use impedance inversion to process GPR field data in a polluted site in Mongolia. The inversion results were constrained using borehole data and validated by resistivity data. 展开更多
关键词 Ground-penetrating radar impedance inversion tapering function stochasticmedium
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Application of 3D GPR attribute technology in archaeological investigations 被引量:5
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作者 赵文轲 田钢 +3 位作者 王帮兵 石战结 林金鑫 《Applied Geophysics》 SCIE CSCD 2012年第3期261-269,359,360,共11页
Ground penetrating radar (GPR) attribute technology has been applied to many aspects in recent years but there are very few examples in the field of archaeology. Especially how can we extract effective attributes fr... Ground penetrating radar (GPR) attribute technology has been applied to many aspects in recent years but there are very few examples in the field of archaeology. Especially how can we extract effective attributes from the two- or three-dimensional radar data so that we can map and describe numerous archaeological targets in a large cultural site? In this paper, we applied GPR attribute technology to investigate the ancient Nanzhao castle-site in Tengchong, Yunnan Province. In order to get better archaeological target (the ancient wall, the ancient kiln site, and the ancient tomb) analysis and description, we collated the GPR data by collected standardization and then put them to the seismic data processing and interpretation workstation. The data was processed, including a variety of GPR attribute extraction, analysis, and optimization and combined with the archaeological drilling data. We choose the RMS Amplitude, Average Peak Amplitude, Instantaneous Phase, and Maximum Peak Time to interpret three archaeological targets. By comparative analysis, we have clarified that we should use different attributes to interpret different archaeological targets and the results of attribute analysis after horizon tracking is much better than the results based on a time slice. 展开更多
关键词 GPR ATTRIBUTE archaeological investigation
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High resolution GPR and its experimental study 被引量:2
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作者 黄玲 曾昭发 +1 位作者 王牧男 王者江 《Applied Geophysics》 SCIE CSCD 2007年第4期301-307,共7页
We develop a high resolution ground penetrating radar system (LANRCS-GPR) based on the E5071B Vector Network Analyzer (VNA). This system takes advantage of a wideband and adjustable frequency domain ground penetra... We develop a high resolution ground penetrating radar system (LANRCS-GPR) based on the E5071B Vector Network Analyzer (VNA). This system takes advantage of a wideband and adjustable frequency domain ground penetrating radar system and adds the characteristics of a network analyzer with ultra-wideband and high precision measurement. It adopts the LAN mode to concatenate system control that reduces construction cost and makes the system easy to expand. The high resolution ground penetrating radar system carries out real time imaging using F-K migration with high calculation efficiency. The experiment results of the system indicate that the LANRCS-GPR system provides high resolution and precision, high signal-to-noise ratio, and great dynamic range. Furthermore, the LANRCS-GPR system is flexible and reliable to operate with easy to expand system functions. The research and development of the LANRCS-GPR provide the theoretical and experimental foundation for future frequency domain ground penetrating radar production and also can serve as an experimental platform with high data gathering precision, enormous information capability, wide application, and convenient operation for electromagnetic wave research and electromagnetic exploration. 展开更多
关键词 high resolution ground penetrating radar vector network analyzer and frequency domain
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新型试验检测技术在道路桥梁检测中的应用研究
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作者 李申赫 《中国科技期刊数据库 工业A》 2023年第4期146-149,共4页
随着我国经济建设的快速发展,交通基础设施也得到了长足进步。作为交通运输体系重要组成部分的公路、城市道路和桥梁等工程项目,其质量问题越来越受到人们关注。因此,对于这些工程项目进行科学合理的检测显得尤为必要。传统的道路桥梁... 随着我国经济建设的快速发展,交通基础设施也得到了长足进步。作为交通运输体系重要组成部分的公路、城市道路和桥梁等工程项目,其质量问题越来越受到人们关注。因此,对于这些工程项目进行科学合理的检测显得尤为必要。传统的道路桥梁检测方法已经不能满足现代化建设需要,而新材料、新工艺以及新技术的不断涌现使得新型试验检测技术应运而生并逐渐成为研究热点。本文主要介绍几种常见的新型试验检测技术及其优缺点分析。希望能够给相关领域的工作人员提供一定参考价值。 展开更多
关键词 道路桥梁 试验检测技术 无损检测 超声波检测 地质雷达检测 探地雷检测仪器
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he adaptive chirplet transform and its application in GPR target detection 被引量:8
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作者 Zeng Zhaofa Wu Fengshou +2 位作者 Huang Ling Liu Fengshan Sun Jiguang 《Applied Geophysics》 SCIE CSCD 2009年第2期192-200,共9页
GPR has become an important geophysical method in UXO and landmine detection, for it can detect both metal and non-metallic targets. However, it is difficult to remove the strong clutters from surface-layer reflection... GPR has become an important geophysical method in UXO and landmine detection, for it can detect both metal and non-metallic targets. However, it is difficult to remove the strong clutters from surface-layer reflection and soil due to the low signal to noise ratio of GPR data. In this paper, we use the adaptive chirplet transform to reject these clutters based on their character and then pick up the signal from the UXO by the transform based on the Radon-Wigner distribution. The results from the processing show that the clutter can be rejected effectively and the target response can be measured with high SNR. 展开更多
关键词 GPR target detection clutter rejection chirplet transform
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Geomorphological Evolution Revealed by Aeolian Sedimentary Structure in Badain Jaran Desert on Alxa Plateau, Northwest China 被引量:7
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作者 BAI Yang WANG Nai'ang +1 位作者 LIAO Kongtai Patrick KLENK 《Chinese Geographical Science》 SCIE CSCD 2011年第3期267-278,共12页
The Badain Jaran Desert,located in the Alxa Plateau,Northwest China,features mega-dunes and a unique dune-lake alternation landscape.This paper presented the aeolian sediment structures of three representative dunes i... The Badain Jaran Desert,located in the Alxa Plateau,Northwest China,features mega-dunes and a unique dune-lake alternation landscape.This paper presented the aeolian sediment structures of three representative dunes in the Badain Jaran Desert using ground-penetrating radar (GPR).We processed and analyzed the GPR data and investigated the feasibility of using integrated GPR and sedimentological data to reconstruct dunes structure,sedimentary environment and geomorphological evolution.The results show that the internal structures of star dune and transverse dune represent various stages of mega-dune evolution: the main deposition processes of mega-dune are similar to those of transverse dunes but have a more complicated mechanism of sand transport and deposition because of the superimposition of dunes;the upper section of the mega-dune has a structure similar to that of star dune,with vertical aggradations on top.Diffraction hyperbolae in the GPR profile indicates that the presence of ancient dunes characterized by calcareous cementation layers is involved in the maintenance of mega-dunes,and water levels,shown by continuous,sub-horizontal GPR reflections,are supposed to be closely related to mega-dunes and the interdune lakes.Outcrop of wet sand and horizontal stratifications on the GPR image indicate moisture potentials with different levels inside mega-dunes.The multiplex geomorphology in the Badain Jaran Desert is the result of global climatic undulation,the unique geographical location,the geological structural features,etc. 展开更多
关键词 Badain Jaran Desert Ground-Penetrating Radar (GPR) mega-dunes sedimentary structure geomor- phological evolution
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Modified Method for Estimating Organic Carbon Density in Discontinuous Karst Soil Using Ground-Penetrating Radar and Geostatistics 被引量:4
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作者 LI Lei XIA Yin-hang +6 位作者 LIU Shu-juan ZHANG Wei CHEN Xiang-bi ZHENG Hua QIU Hu-sen HE Xun-yang SU Yi-rong 《Journal of Mountain Science》 SCIE CSCD 2015年第5期1229-1240,共12页
The conventional method which assumes the soil distribution is continuous was unsuitable for estimating soil organic carbon density(SOCD) in Karst areas because of its discontinuous soil distribution. The accurate est... The conventional method which assumes the soil distribution is continuous was unsuitable for estimating soil organic carbon density(SOCD) in Karst areas because of its discontinuous soil distribution. The accurate estimation of SOCD in Karst areas is essential for carbon sequestration assessment in China. In this study, a modified method,which considers the vertical proportion of soil area in the profile when calculating the SOCD, was developed to estimate the SOCD in a typical Karst peak-cluster depression area in southwest China. In the modified method, ground-penetrating radar(GPR) technology was used to detect the distribution and thickness of soil. The accuracy of the method was confirmed through comparison with the data obtained using a validation method, in which the soil thickness was measured by excavation. In comparison with the conventional method and average-soil-depth method,the SOCD estimated using the GPR method showed the minimum relative error with respect to that obtained using the validation method. At a regional scale, the average SOCDs at depths of 0-20 cm and 0-100 cm, which were interpolated by ordinary kriging,were 1.49(ranging from 0.03-5.65) and 2.26(0.09-11.60) kgm-2based on GPR method in our study area(covering 393.6 hm2), respectively. Therefore, the modified method can be applied on the accurate estimation of SOCD in discontinuous soil areas such as Karst regions. 展开更多
关键词 Discontinuous soil Organic carbondensity Soil distribution Estimation method Ground penetrating radar KARST Peak clusterdepression
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GPR based RTM imaging technology for estimating rhizome diameters and application in the western China mining area 被引量:2
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作者 Cui Fan Li Shuai +3 位作者 Yuan Jiong-Xuan Bai Jie-Bin Zhao Yu-Xuan Zhou Ying-Ging 《Applied Geophysics》 SCIE CSCD 2020年第1期154-166,170,共14页
The rhizome functions are of great significance to the ecological protection of the western China mining area,whose ecological management can be provided with technical support via accurate calculations of the rhizome... The rhizome functions are of great significance to the ecological protection of the western China mining area,whose ecological management can be provided with technical support via accurate calculations of the rhizome biomass.The rhizome diameter is an important index parameter of rhizome biomass.In this study,we propose an estimation of rhizome diameters based on ground penetrating radar(GPR)-based reverse time migration(RTM)imaging technology.First,the spatial distribution of shallow rhizomes is simulated using the finite difference time domain method.The simulation data are examined via RTM imaging and single-channel rhizome analysis to obtain the rhizome index parameters:Δh,the width of the maximum positive peak amplitude measured at an amplitude of zero,andΔH,the distance between the zero-amplitude position above the largest positive peak in the shallow region and the zero-amplitude position below the largest positive peak in the deeper region.The experiments of physical models verify the effectiveness of the two parameters(Δh andΔH).and indicate that the values ofΔh andΔH are independent of the rhizome burial depth;instead,they are only related to the diameter of the rhizome.For both the numerical simulations and the physical model experiment,the estimation errors ofΔh andΔH for the rhizome diameters can be constrained to less than 6%and 5%,respectively,which shows that the estimation of the rhizome diameters using GPR based RTM imaging technology is reasonable and effective and its high estimation accuracy meets the technical requirements. 展开更多
关键词 Ground penetrating radar western China mining area RTM imaging rhizome diameter estimation
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Identifying soil structure along headwater hillslopes using ground penetrating radar based technique 被引量:7
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作者 HAN Xiao-le LIU Jin-tao +1 位作者 ZHANG Jun ZHANG Zhi-cai 《Journal of Mountain Science》 SCIE CSCD 2016年第3期405-415,共11页
Soil structure plays an important role in understanding soil attributes as well as hydrological processes. Effective method to obtain high quality soil map is therefore important for both soil science research and soi... Soil structure plays an important role in understanding soil attributes as well as hydrological processes. Effective method to obtain high quality soil map is therefore important for both soil science research and soil work ability improvement. However,traditional method such as digging soil pits is destructive and time-consuming. In this study, the structure of headwater hillslopes from Hemuqiao catchment(Taihu Basin, China) have been analyzed both by indirect(ground penetrating radar, GPR) and direct(excavation or soil auger) methods. Four transects at different locations of hillslopes in the catchment were selected for GPR survey. Three of them(#1, #2, and #3) were excavated to obtain fullscale soil information for interpreting radar images.We found that the most distinct boundary that can be detected by GPR is the boundary between soil and underlain bedrock. In some cases(e.g., 8-17 m in transect #2), in which the in situ soil was scarcely affected by colluvial process, different soil layers can be identified. This identification process utilized the sensitive of GPR to capture abrupt changes of soil characteristics in layer boundaries, e.g., surface organic layer(layer #1) and bamboo roots layer(layer#2, contain stone fragments), illuvial deposits layer(layer #3) and regolith layer(layer #4). However, in areas where stone fragments were irregularly distributed in the soil profile(highly affected bycolluvial and/or fluvial process), it was possible to distinguish which part contains more stone fragments in soil profile on the basis of reflection density(transect #3). Transect #4(unexcavated) was used to justify the GPR method for soil survey based on experiences from former transects. After that, O horizon thickness was compared by a hand auger.This work has demonstrated that GPR images can be of a potential data source for hydrological predictions. 展开更多
关键词 Ground Penetrating Radar(GPR) Hillslope Soil structure
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CLUTTER SUPPRESSION METHOD IN GPR USING PARTICLE CLUSTERING 被引量:3
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作者 Lu Cewu Liu Xiaojun Zhao Bo Fang Guangyou 《Journal of Electronics(China)》 2009年第5期584-587,共4页
In this paper, a novel clutter suppression method in Ground Penetrating Radar (GPR) is proposed. Time segments of hill are represented by their corresponding particle in B-scan. Those particles in B-scan are clustered... In this paper, a novel clutter suppression method in Ground Penetrating Radar (GPR) is proposed. Time segments of hill are represented by their corresponding particle in B-scan. Those particles in B-scan are clustered to represent reflectors (such as buried targets, air-soil interface). The clusters of buried target have a particle sequence with single peak. Therefore, if the particles donot belong to the cluster of buried target, time segment they represent will be suppressed. Experimental results and simulation are provided to demonstrate that the new algorithm outperforms existing approaches. 展开更多
关键词 Ground Penetrating Radar (GPR) Clutter suppression CLUSTERING
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Automatic prediction of time to failure of open pit mine slopes based on radar monitoring and inverse velocity method 被引量:10
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作者 Osasan K.S. Stacey T.R. 《International Journal of Mining Science and Technology》 SCIE EI 2014年第2期275-280,共6页
Radar slope monitoring is now widely used across the world, for example, the slope stability radar(SSR)and the movement and surveying radar(MSR) are currently in use in many mines around the world.However, to fully re... Radar slope monitoring is now widely used across the world, for example, the slope stability radar(SSR)and the movement and surveying radar(MSR) are currently in use in many mines around the world.However, to fully realize the effectiveness of this radar in notifying mine personnel of an impending slope failure, a method that can confidently predict the time of failure is necessary. The model developed in this study is based on the inverse velocity method pioneered by Fukuzono in 1985. The model named the slope failure prediction model(SFPM) was validated with the displacement data from two slope failures monitored with the MSR. The model was found to be very effective in predicting the time to failure while providing adequate evacuation time once the progressive displacement stage is reached. 展开更多
关键词 Slope monitoring radar Displacement Rate of displacement Slope failure Slope monitoring Time to failure
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Second-generation wavelet finite element based on the lifting scheme for GPR simulation 被引量:1
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作者 Feng De-Shan Zhang Hua Wang Xun 《Applied Geophysics》 SCIE CSCD 2020年第1期143-153,170,共12页
Ground-penetrating radar(GPR)is a highly efficient,fast and non-destructive exploration method for shallow surfaces.High-precision numerical simulation method is employed to improve the interpretation precision of det... Ground-penetrating radar(GPR)is a highly efficient,fast and non-destructive exploration method for shallow surfaces.High-precision numerical simulation method is employed to improve the interpretation precision of detection.Second-generation wavelet finite element is introduced into the forward modeling of the GPR.As the finite element basis function,the second-generation wavelet scaling function constructed by the scheme is characterized as having multiple scales and resolutions.The function can change the analytical scale arbitrarily according to actual needs.We can adopt a small analysis scale at a large gradient to improve the precision of analysis while adopting a large analytical scale at a small gradient to improve the efficiency of analysis.This approach is beneficial to capture the local mutation characteristics of the solution and improve the resolution without changing mesh subdivision to realize the efficient solution of the forward GPR problem.The algorithm is applied to the numerical simulation of line current radiation source and tunnel non-dense lining model with analytical solutions.Result show that the solution results of the secondgeneration wavelet finite element are in agreement with the analytical solutions and the conventional finite element solutions,thereby verifying the accuracy of the second-generation wavelet finite element algorithm.Furthermore,the second-generation wavelet finite element algorithm can change the analysis scale arbitrarily according to the actual problem without subdividing grids again.The adaptive algorithm is superior to traditional scheme in grid refinement and basis function order increase,which makes this algorithm suitable for solving complex GPR forward-modeling problems with large gradient and singularity. 展开更多
关键词 Ground penetrating radar wave equation second-generation wavelet finite element method lifting scheme forward modeling
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Evaluating some factors that affect feasility of using ground penetrating radar for landmine detection 被引量:2
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作者 Mohamed Metwaly Ahmed Ismail Jun Matsushima 《Applied Geophysics》 SCIE CSCD 2007年第3期221-230,共10页
Ground penetrating radar (GPR) is one of the promising technologies that can be used to detect landmines. Many factors may affect the ability of GPR to detect landmines. Among those factors are: 1) the type of lan... Ground penetrating radar (GPR) is one of the promising technologies that can be used to detect landmines. Many factors may affect the ability of GPR to detect landmines. Among those factors are: 1) the type of landmine material (metallic or plastic), 2) conditions of the host soil (soil texture and soil moisture), and 3) the radar frequency utilized. The impact of these factors on the ability of GPR to detect landmines is investigated by studying their effect on the dielectric permittivity contrast between the landmine and the host soil, as well as on the attenuation of the radar waves. The impact of each factor was theoretically reviewed and modeled using the Matlab and Mathcad software packages. Results of the computer modeling were correlated with GPR data acquired for metallic and plastic landmine types. It was found that the ability of GPR to detect landmines depends to a great extent on the landmine type, water content of the host soil, utilized radar frequency, and soil texture. The landmines are much easier to detect than plastic landmines for any soil conditions and any radar frequency. Increasing the soil's moisture content, regardless of soil texture, eases the detection of the plastic landmine and worsens the detection of the metallic mines. Increasing the percentage of clay in the soil causes the same effect as the moisture content. However, higher radar frequency delivers better results for landmine detection as long as the percentage of clay and the moisture content in the soil remains low. The results of this study are expected to help in selecting optimum radar antennae and data acquisition parameters depending on the landmine type and environmental conditions. 展开更多
关键词 LANDMINE dielectric permittivity GPR
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Application of GPR reverse time migration in tunnel lining cavity imaging 被引量:1
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作者 Lv Yu-zeng Wang Hong-hua Gong Jun-bo 《Applied Geophysics》 SCIE CSCD 2020年第2期277-284,316,共9页
Correctly locating the tunnel lining cavity is extremely important tunnel quality inspection.High-accuracy imaging results are hard to obtain because conventional one-way wave migration is greatly aff ected by lateral... Correctly locating the tunnel lining cavity is extremely important tunnel quality inspection.High-accuracy imaging results are hard to obtain because conventional one-way wave migration is greatly aff ected by lateral velocity change and inclination limitation and because the diff racted wave cannot be accurately returned to the real spatial position of the lining cavity.This paper presents a tunnel lining cavity imaging method based on the groundpenetrating radar(GPR)reverse-time migration(RTM)algorithm.The principle of GPR RTM is described in detail using the electromagnetic wave equation.The finite-difference timedomain method is employed to calculate the backward extrapolation electromagnetic fi elds,and the zero-time imaging condition based on the exploding-reflector concept is used to obtain the RTM results.On this basis,the GPR RTM program is compiled and applied to the simulated and observed GPR data of a typical tunnel lining cavity GPR model and a physical lining cavity model.Comparison of RTM and Kirchhoff migration results reveals that the RTM can better converge the diff racted waves of steel bar and cavity to their true position and have higher resolution and better suppress the eff ect of multiple interference and clutter scattering waves.In addition,comparison of RTM results of diff erent degrees of noise shows that RTM has strong anti-interference ability and can be used for the accurate interpretation of radar profi le in a strong interference environment. 展开更多
关键词 Tunnel lining cavity ground-penetrating radar(GPR) reverse-time migration(RTM) zero-time imaging condition
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An element-free Galerkin method for ground penetrating radar numerical simulation 被引量:2
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作者 冯德山 郭荣文 王洪华 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第1期261-269,共9页
An element-free Galerkin method(EFGM) is used to solve the two-dimensional(2D) ground penetrating radar(GPR)modelling problems, due to its simple pre-processing, the absence of elements and high accuracy. Different fr... An element-free Galerkin method(EFGM) is used to solve the two-dimensional(2D) ground penetrating radar(GPR)modelling problems, due to its simple pre-processing, the absence of elements and high accuracy. Different from element-based numerical methods, this approach makes nodes free from the elemental restraint and avoids the explicit mesh discretization. First, we derived the boundary value problem for the 2D GPR simulation problems. Second, a penalty function approach and a boundary condition truncated method were used to enforce the essential and the absorbing boundary conditions, respectively. A three-layered GPR model was used to verify our element-free approach. The numerical solutions show that our solutions have an excellent agreement with solutions of a finite element method(FEM). Then, we used the EFGM to simulate one more complex model to show its capability and limitations. Simulation results show that one obvious advantage of EFGM is the absence of element mesh, which makes the method very flexible. Due to the use of MLS fitting, a key feature of EFM, is that both the dependent variable and its gradient are continuous and have high precision. 展开更多
关键词 element-free Galerkin method moving least-squares method ground penetrating radar forward simulation
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