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2007 4th International Workshop on, Advanced Ground Penetrating Radar最新文献

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Influence of Mode Conversion at Borehole on Direction Finding with Dipole Array Antenna 钻孔模式转换对偶极子阵列天线测向的影响
2007 4th International Workshop on, Advanced Ground Penetrating Radar Pub Date : 2007-06-27 DOI: 10.1109/AGPR.2007.386521
S. Ebihara, Y. Inaida, R. Suzuki
{"title":"Influence of Mode Conversion at Borehole on Direction Finding with Dipole Array Antenna","authors":"S. Ebihara, Y. Inaida, R. Suzuki","doi":"10.1109/AGPR.2007.386521","DOIUrl":"https://doi.org/10.1109/AGPR.2007.386521","url":null,"abstract":"We investigate influence on DOA estimation with the circular dipole array antenna in a borehole (CAB), when the TE plane wave incident on the CAB. According to calculation of electromagnetic fields of the TE plane wave, vertical component of the electric field is excited by the cylindrical layers around the antenna, and these phenomena are called mode conversion in this paper. This increases error of DOA estimation, if we assume that the TM wave is incident on the CAB like in [4] during the array signal processing. We introduce the index ¿(t) in order to represent quantity of component excited by the mode conversion. According to the experiment in air and field experiments, we confirmed that the mode conversion occurs, and this would influence DOA estimation with the CAB.","PeriodicalId":411104,"journal":{"name":"2007 4th International Workshop on, Advanced Ground Penetrating Radar","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120939084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Evaluating GroundPenetrating Radar use for water infiltration monitoring 评价探地雷达在水入渗监测中的应用
2007 4th International Workshop on, Advanced Ground Penetrating Radar Pub Date : 2007-06-27 DOI: 10.2136/vzj2007.0132
A. Saintenoy, S. Schneider, P. Tucholka
{"title":"Evaluating GroundPenetrating Radar use for water infiltration monitoring","authors":"A. Saintenoy, S. Schneider, P. Tucholka","doi":"10.2136/vzj2007.0132","DOIUrl":"https://doi.org/10.2136/vzj2007.0132","url":null,"abstract":"Ground-Penetrating Radar (GPR) was used to monitor water infiltration in sand. Water was injected down an 81 cm long tubed hole with a piezometer recording the depth of water and a tap valve used to adjust it to 15 cm ± 2 cm above the bottom of the tube. During the 20 minutes of infiltration two GPR antennas (transmitter and receiver) were recording a trace every second from an offset position on the surface. The signal, enhanced by differential correction allows to trace the evolution of top and bottom limits of the water bulb in space and time. Comparison with hydrodynamic model of the infiltration process proves that the GPR reflections trace the wetting front and not the saturation bulb. An exact, quantified estimation of the evolution of the top border of the wetting zone is provided. For the bottom border, further work on the estimation of the velocity of radar wave in the infiltration bulb will be needed.","PeriodicalId":411104,"journal":{"name":"2007 4th International Workshop on, Advanced Ground Penetrating Radar","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123755133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 57
An innovative on-board processor for the real-time GPR monitoring of railway substructure conditions 一种创新的车载处理器，用于实时GPR监测铁路路基状况
2007 4th International Workshop on, Advanced Ground Penetrating Radar Pub Date : 2007-06-27 DOI: 10.1109/AGPR.2007.386568
S. Caorsi, G. Cevini, F. Burro, M. Sciotti, S. Sorge
{"title":"An innovative on-board processor for the real-time GPR monitoring of railway substructure conditions","authors":"S. Caorsi, G. Cevini, F. Burro, M. Sciotti, S. Sorge","doi":"10.1109/AGPR.2007.386568","DOIUrl":"https://doi.org/10.1109/AGPR.2007.386568","url":null,"abstract":"The SAFE-RAIL system and the relevant processing unit are hereafter described as a success case for the solution of an electromagnetic inverse problem in real-time applications. The SAFE-RAIL system on-board processing unit is conceived for providing functionalities for real-time exploitation of raw data deriving from microwave sensing action through innovative GPR equipment. In particular, the main objective, as per European STREP project SAFE-RAIL statements, is focused on automatic interpretation of microwave sensed data relevant to rail-track subsurface, aiming at characterizing the ballast and sub-ballast layer properties with consequent extraction in real-time of geophysical parameters. A neural network based approach has been exploited as an efficient way for solving the inverse problem through a \"learning-by-examples\" approach. The capability of the SAFE-RAIL system in matching real-time performance requirements has been investigated. System operability and cost-effective implementation issues have also been deeply addressed.","PeriodicalId":411104,"journal":{"name":"2007 4th International Workshop on, Advanced Ground Penetrating Radar","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126803502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
General representations of electromagnetic interferometry 电磁干涉测量的一般表示
2007 4th International Workshop on, Advanced Ground Penetrating Radar Pub Date : 2007-06-27 DOI: 10.1109/AGPR.2007.386515
E. Slob, K. Wapenaar
{"title":"General representations of electromagnetic interferometry","authors":"E. Slob, K. Wapenaar","doi":"10.1109/AGPR.2007.386515","DOIUrl":"https://doi.org/10.1109/AGPR.2007.386515","url":null,"abstract":"The theoretical and experimental developments in interferometry have advanced spectacularly over the last five years and are still expanding at a rapid pace. With interferometry we mean the retrieval of the Green's function by cross-correlating or cross-convolving two (wave) field recordings. Over the last year several contributions have included interferometric representations for media with losses, in absence of wave phenomena, like in thermal and electromagnetic diffusion or viscous flow, and for moving media. In this paper we use the reciprocity theorems of the time-correlation and time-convolution types to formulate general representations for electromagnetic fields and waves, and give explicit expressions for different possible GPR applications involving controlled or uncontrolled sources, which can be transient or noise sources.","PeriodicalId":411104,"journal":{"name":"2007 4th International Workshop on, Advanced Ground Penetrating Radar","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114777017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Determination of soil permittivity from GPR data and a microwave tomography approach: a preliminary study 利用探地雷达数据和微波层析成像方法测定土壤介电常数:初步研究
2007 4th International Workshop on, Advanced Ground Penetrating Radar Pub Date : 2007-06-27 DOI: 10.1109/AGPR.2007.386532
F. Soldovieri, G. Prisco, R. Persico
{"title":"Determination of soil permittivity from GPR data and a microwave tomography approach: a preliminary study","authors":"F. Soldovieri, G. Prisco, R. Persico","doi":"10.1109/AGPR.2007.386532","DOIUrl":"https://doi.org/10.1109/AGPR.2007.386532","url":null,"abstract":"In this paper we present a new strategy to retrieve the dielectric permittivity of the soil starting from B-Scan GPR data, gathered on a pipe buried on purpose and processed by means of a microwave tomography algorithm. The validation will be performed by making use of synthetic data, obtained from an FDTD code. The results of the proposed approach shall be compared with those achieved from the hyperbolas of the radar traces and from the Hough Transform based approach.","PeriodicalId":411104,"journal":{"name":"2007 4th International Workshop on, Advanced Ground Penetrating Radar","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122209331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Characterization of inhomogeneous cylinders from transient data 从瞬态数据表征非均匀圆柱体
2007 4th International Workshop on, Advanced Ground Penetrating Radar Pub Date : 2007-06-27 DOI: 10.1109/AGPR.2007.386540
K. Belkebir, I. Catapano, J. Geffrin
{"title":"Characterization of inhomogeneous cylinders from transient data","authors":"K. Belkebir, I. Catapano, J. Geffrin","doi":"10.1109/AGPR.2007.386540","DOIUrl":"https://doi.org/10.1109/AGPR.2007.386540","url":null,"abstract":"In this paper we propose a non linear inversion approach, which is able to characterize a scattering system from the knowledge of the transient scattered field measured when only one electromagnetic source is used to illuminate the objects. Such a source radiates a double-frequency Gaussian incident pulse, that is a pulse shape whose spectrum assumes its maximum value around two different frequencies. The inversion problem is formulated in the frequency domain rather than directly in the time domain and an iterative method is exploited to retrieve the unknown permittivity and conductivity profiles. The proposed strategy works in the canonical two-dimensional scalar case and its reconstruction capabilities are tested against experimental data concerning inhomogeneous targets.","PeriodicalId":411104,"journal":{"name":"2007 4th International Workshop on, Advanced Ground Penetrating Radar","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122225331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A Full Waveforminversion Algorithm for Interpreting Crosshole Radar Data 井间雷达数据全波形版本解释算法
2007 4th International Workshop on, Advanced Ground Penetrating Radar Pub Date : 2007-06-27 DOI: 10.1109/AGPR.2007.386546
S. Kuroda, M. Takeuchi, H. Kim
{"title":"A Full Waveforminversion Algorithm for Interpreting Crosshole Radar Data","authors":"S. Kuroda, M. Takeuchi, H. Kim","doi":"10.1109/AGPR.2007.386546","DOIUrl":"https://doi.org/10.1109/AGPR.2007.386546","url":null,"abstract":"Ground-penetrating radar (GPR) is a useful tool for civil and environmental engineering fields because of its high resolving power and non-destructive measurements. This paper presents a method of full-waveform inversion of borehole GPR data for imaging permittivity structures. The inversion algorithm is based on a conjugate gradient search for the minimum of an error functional relating to the difference between measured and predicted data. A small model perturbation in the functional can be efficiently calculated by propagating the data error back into the model in reverse time and correlating the field generated by the back-propagation with the corresponding incident field at each point. A finite difference time domain (FDTD) method is used for solving Maxwell's equations to obtain incident electromag-netic wavefields. Back-propagated wavefields satisfy adjoint Maxwell's equations, which are stable in reverse time and can be solved by the same FDTD scheme. The imaging scheme is applied to crosshole radar configuration, thereby demonstrating its capability to reconstruct permittivity structures. Tests on a two-dimensional synthetic model produce good images of target scatterers and show stable convergence.","PeriodicalId":411104,"journal":{"name":"2007 4th International Workshop on, Advanced Ground Penetrating Radar","volume":"26 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126566709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
EM characterization of bituminous concretes using a quadratic experimental design 使用二次实验设计的沥青混凝土的电磁表征
2007 4th International Workshop on, Advanced Ground Penetrating Radar Pub Date : 2007-06-27 DOI: 10.1109/AGPR.2007.386567
A. Chazelas, B. X. Derobert, C. M. Adous, D. Villain, E. V. Baltazart, F. Laguerre, G. Queffelec
{"title":"EM characterization of bituminous concretes using a quadratic experimental design","authors":"A. Chazelas, B. X. Derobert, C. M. Adous, D. Villain, E. V. Baltazart, F. Laguerre, G. Queffelec","doi":"10.1109/AGPR.2007.386567","DOIUrl":"https://doi.org/10.1109/AGPR.2007.386567","url":null,"abstract":"This paper describes the characterization of bitumen concretes by measurement cells, within the ground-penetrating radar frequency band, on mixtures defined by a specific experimental design. This one is from a fractional ¿ plan (41. 24) which limits the design to 32 mixtures. The parameters, classically used and chosen by road specialists for this specific study, are the nature of the aggregates, the binder richness modulus, the compaction, the maximum size of the aggregates and the continuity of the granulometry. The model, associated with the experimental design, tends to fit a multiple linear regression describing the relationship between measures and the chosen parameters. Two successive levels of calculation have been realized, independently for either the real part and the imaginary part of the relative permittivity. Globally, The first calculation, taking into account all the parameters and their interactions, shows, in the frequency band [100 - 1300 MHz], that the model explains about 84 % of the measured permittivity. When limiting to a reduced design, keeping only the significant parameters and interactions, results tend to about 85%.","PeriodicalId":411104,"journal":{"name":"2007 4th International Workshop on, Advanced Ground Penetrating Radar","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114697823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Investigation of Convenient Antenna Designs for Ultra-Wide Band GPR Systems 超宽带GPR系统便捷天线设计研究
2007 4th International Workshop on, Advanced Ground Penetrating Radar Pub Date : 2007-06-27 DOI: 10.1109/AGPR.2007.386550
A. S. Turk, D. Sahinkaya, Mehmet Sezgin, H. Nazlı
{"title":"Investigation of Convenient Antenna Designs for Ultra-Wide Band GPR Systems","authors":"A. S. Turk, D. Sahinkaya, Mehmet Sezgin, H. Nazlı","doi":"10.1109/AGPR.2007.386550","DOIUrl":"https://doi.org/10.1109/AGPR.2007.386550","url":null,"abstract":"This paper proposes the planar and 3-dimensional ultra-wide band (UWB) antenna types suitable for hand-held and vehicle mounted impulse GPR systems. On this scope, bow-tie, spiral, TEM horn, dielectric-loaded Vivaldi, multi-sensor adaptive and array model antenna configurations are designed, simulated and measured. The numerical and experimental results are presented with performance comparisons.","PeriodicalId":411104,"journal":{"name":"2007 4th International Workshop on, Advanced Ground Penetrating Radar","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115105136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 21
Characterizing Railroad Ballast Using GPR: Recent Experiences in the United States 用探地雷达描述铁路压载物:美国最近的经验
2007 4th International Workshop on, Advanced Ground Penetrating Radar Pub Date : 2007-06-27 DOI: 10.1109/AGPR.2007.386570
R. Roberts, A. Schutz, I. Al-Qadi, E. Tutumluer
{"title":"Characterizing Railroad Ballast Using GPR: Recent Experiences in the United States","authors":"R. Roberts, A. Schutz, I. Al-Qadi, E. Tutumluer","doi":"10.1109/AGPR.2007.386570","DOIUrl":"https://doi.org/10.1109/AGPR.2007.386570","url":null,"abstract":"Recent work has been conducted in the United States with 2 GHz horn antennas to characterize railroad ballast. There were a number observations made during the course of the project that derive from gaining a more thorough understanding of ballast and the interaction of GPR with the ballast matrix. The major observations from over 238 km of track data at four different geographical locations include: (1) it cannot be assumed that there will be a reflection from the bottom of clean ballast or that there will be a reflection from the ballast-subballast interface; (2) the presence of a strong reflection in the data generally, but not always, infers moderately-fouled to clean ballast above the reflecting boundary; and (3) no observable ballast-subballast interface reflections are generally, but not always, associated with gradational fouling or a fully-fouled ballast section.","PeriodicalId":411104,"journal":{"name":"2007 4th International Workshop on, Advanced Ground Penetrating Radar","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130131205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
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