Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441569
E. Huber, B. Anders, P. Huggenberger
In straight gravel-bed river reaches, riverbank erosion can be induced by alternate bars and their associated scours. The maximum scour depth is therefore a key information to design reliable flood protections. However, scour depth cannot be correctly assessed by bathymetric riverbed surveys if scours are filled with sediments at low discharge. In this work, scour depths in a straightened, gravel-bed river with alternate bars is quantified with ground-penetrating radar (GPR) and the riverbed morphology is linked to the subsurface structure. A 4.5 m deep buried scour with an extent of 30 × 100 m is partially imaged by GPR at the front end of the gravel bar next to the riverbank. The non-imaged part of the scour is expected to be much larger and therefore deeper. Additional research is needed to assess how scour location and depth relate with discharge magnitude and gravel bar dynamics.
{"title":"Quantifying scour depth in a straightened gravel-bed river with ground-penetrating radar","authors":"E. Huber, B. Anders, P. Huggenberger","doi":"10.1109/ICGPR.2018.8441569","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441569","url":null,"abstract":"In straight gravel-bed river reaches, riverbank erosion can be induced by alternate bars and their associated scours. The maximum scour depth is therefore a key information to design reliable flood protections. However, scour depth cannot be correctly assessed by bathymetric riverbed surveys if scours are filled with sediments at low discharge. In this work, scour depths in a straightened, gravel-bed river with alternate bars is quantified with ground-penetrating radar (GPR) and the riverbed morphology is linked to the subsurface structure. A 4.5 m deep buried scour with an extent of 30 × 100 m is partially imaged by GPR at the front end of the gravel bar next to the riverbank. The non-imaged part of the scour is expected to be much larger and therefore deeper. Additional research is needed to assess how scour location and depth relate with discharge magnitude and gravel bar dynamics.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122309627","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441563
J. Hugenschmidt, Andreas Mäder
Remains of pile dwellings are present in many lakes around the Alps, particularly north of the Alps in Germany, Austria and Switzerland. Those remains originating from 5000–1000 B.C. are listed as UNESCO World Heritage because of their historical and cultural importance and thus, deserve protection. On the known pile dwelling site of Freienbach-Hurden/Seefeld in Lake Zurich near Rapperswil, Switzerland several investigations were carried out to map and characterize the cultural layers. Amongst other inspections a GPR survey was carried out. Data were acquired in shallow water with a boat, processed and interpreted with the help of drilling information. The final results was a 3-D model of cultural layers which can now be used for the planning of protective measures.
{"title":"GPR investigation of remains of pile dwellings in Lake Zurich","authors":"J. Hugenschmidt, Andreas Mäder","doi":"10.1109/ICGPR.2018.8441563","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441563","url":null,"abstract":"Remains of pile dwellings are present in many lakes around the Alps, particularly north of the Alps in Germany, Austria and Switzerland. Those remains originating from 5000–1000 B.C. are listed as UNESCO World Heritage because of their historical and cultural importance and thus, deserve protection. On the known pile dwelling site of Freienbach-Hurden/Seefeld in Lake Zurich near Rapperswil, Switzerland several investigations were carried out to map and characterize the cultural layers. Amongst other inspections a GPR survey was carried out. Data were acquired in shallow water with a boat, processed and interpreted with the help of drilling information. The final results was a 3-D model of cultural layers which can now be used for the planning of protective measures.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121815347","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441671
D. Nobes, Kim A. Hammond, K. Bassett
Ground penetrating radar (GPR) has proven to be useful for mapping river bedforms, but can also be used to monitor river levels and changing bedforms when in flood and manual measurement may be dangerous. However, there is some uncertainty and lack of clarity on the effects of suspended sediments on the GPR velocity. We present here the results of an experiment to measure the cross-section of the Rakaia River bed during different stages of flow during and after a significant hydrological event. We were able to determine the best fit velocity and scale the GPR travel times to obtain the bedform cross-section remotely. The velocity was about 15 % higher during the highest flow rates, when suspended sediment content was also high. The results are limited but, nonetheless, there is a clear relationship between increasing GPR velocity and increasing suspended sediment concentrations.
{"title":"Effect of suspended sediments on ground penetrating radar imaging of riverbeds","authors":"D. Nobes, Kim A. Hammond, K. Bassett","doi":"10.1109/ICGPR.2018.8441671","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441671","url":null,"abstract":"Ground penetrating radar (GPR) has proven to be useful for mapping river bedforms, but can also be used to monitor river levels and changing bedforms when in flood and manual measurement may be dangerous. However, there is some uncertainty and lack of clarity on the effects of suspended sediments on the GPR velocity. We present here the results of an experiment to measure the cross-section of the Rakaia River bed during different stages of flow during and after a significant hydrological event. We were able to determine the best fit velocity and scale the GPR travel times to obtain the bedform cross-section remotely. The velocity was about 15 % higher during the highest flow rates, when suspended sediment content was also high. The results are limited but, nonetheless, there is a clear relationship between increasing GPR velocity and increasing suspended sediment concentrations.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131446019","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441603
Zejun Dong, Xuan Feng, Cai Liu, Yan Zhang, E. Nilot, Minghe Zhang, Haoqiu Zhou
Polarimetric technology has attracted huge attention in the Ground Penetrating Radar (GPR) community during recent decades. Polarization signal analysis has been applied to identify subsurface fractures, pipes, and unexploded ordnance. But there are many factors that can cause distortion of the polarization information, such as the ground surface and the soil. In order to obtain more accurate scattering information of the subsurface targets and reduce or eliminate these effects, we discuss the reason why the direction of polarization of the electromagnetic wave is rotated when it propagate through the media interface. When the plane electromagnetic wave is propagating through Gaussian rough surface, the transmission coefficient can be presented using the Kirchhoff scalar approximation. In this paper, The polarization rotation characteristics of transmission coefficient was obtained and some significant results were analyzed in detail.
{"title":"Study on Polarization Rotation of Electromagnetic Plane Wave from Rough Surface","authors":"Zejun Dong, Xuan Feng, Cai Liu, Yan Zhang, E. Nilot, Minghe Zhang, Haoqiu Zhou","doi":"10.1109/ICGPR.2018.8441603","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441603","url":null,"abstract":"Polarimetric technology has attracted huge attention in the Ground Penetrating Radar (GPR) community during recent decades. Polarization signal analysis has been applied to identify subsurface fractures, pipes, and unexploded ordnance. But there are many factors that can cause distortion of the polarization information, such as the ground surface and the soil. In order to obtain more accurate scattering information of the subsurface targets and reduce or eliminate these effects, we discuss the reason why the direction of polarization of the electromagnetic wave is rotated when it propagate through the media interface. When the plane electromagnetic wave is propagating through Gaussian rough surface, the transmission coefficient can be presented using the Kirchhoff scalar approximation. In this paper, The polarization rotation characteristics of transmission coefficient was obtained and some significant results were analyzed in detail.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131574129","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441669
N. Diamanti, J. Redman, A. P. Annan
Density is one of the most important parameters in construction of asphalt mixtures and pavement engineering. When a mixture is properly designed and compacted, it will contain enough air voids to prevent plastic deformation but will have low enough air voids to prevent water ingress and moisture damage. The ability to map asphalt pavement density has been identified as a key variable that predicts the future life and performance of asphalt pavement. We describe a new instrument, the Pavement Density Profiler (PDP) that has evolved from many years of making measurements of road properties. This instrument measures the electromagnetic (EM) wave impedance to infer the asphalt pavement density (or degree of compaction), locally and over profiles.
{"title":"A GPR-based Sensor to Measure Asphalt Pavement Density","authors":"N. Diamanti, J. Redman, A. P. Annan","doi":"10.1109/ICGPR.2018.8441669","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441669","url":null,"abstract":"Density is one of the most important parameters in construction of asphalt mixtures and pavement engineering. When a mixture is properly designed and compacted, it will contain enough air voids to prevent plastic deformation but will have low enough air voids to prevent water ingress and moisture damage. The ability to map asphalt pavement density has been identified as a key variable that predicts the future life and performance of asphalt pavement. We describe a new instrument, the Pavement Density Profiler (PDP) that has evolved from many years of making measurements of road properties. This instrument measures the electromagnetic (EM) wave impedance to infer the asphalt pavement density (or degree of compaction), locally and over profiles.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134369710","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441694
R. Persico, S. D’Amico, L. Matera, E. Colica, Cynthia De Giorgio, Adriana Alescio, C. Sammut, P. Galea
In this contribution the results of a Ground Penetrating Radar (GPR) prospecting survey in the chapel of Aragon, within the Co-cathedral of St. John in Valletta, Malta, are presented. These results are part of a wider campaign carried out with the final goal of prospecting the subsurface in order to identify voids and/or graves beneath the tomb slabs composing the complex flooring of the entire Co-Cathedral. In particular, in the chapel of Aragon results were compared with historical documents in order to identify possible burial sites. In addition, a 3D digital model of the Chapel has been obtained through the use of photogrammetric techniques with the ultimate goal of integrating the GPR results within the digital model.
{"title":"GPR prospecting in the chapel of Aragon within the Co-Cathedral of St. John (Valletta, Malta)","authors":"R. Persico, S. D’Amico, L. Matera, E. Colica, Cynthia De Giorgio, Adriana Alescio, C. Sammut, P. Galea","doi":"10.1109/ICGPR.2018.8441694","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441694","url":null,"abstract":"In this contribution the results of a Ground Penetrating Radar (GPR) prospecting survey in the chapel of Aragon, within the Co-cathedral of St. John in Valletta, Malta, are presented. These results are part of a wider campaign carried out with the final goal of prospecting the subsurface in order to identify voids and/or graves beneath the tomb slabs composing the complex flooring of the entire Co-Cathedral. In particular, in the chapel of Aragon results were compared with historical documents in order to identify possible burial sites. In addition, a 3D digital model of the Chapel has been obtained through the use of photogrammetric techniques with the ultimate goal of integrating the GPR results within the digital model.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114644142","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441533
L. Fedorova, G. Kulyandin, D. Savvin
Possibilities of estimating rock moisture based on ground penetrating radar data were considered. A methodology for estimating moisture of dispersed rocks has been proposed which uses an empirical formula based on the relative change of delay time $(mathbf{N}_{mathrm{t}})$ of GPR signals reflected from the medium interface in the frozen ($(mathbf{t}_{mathbf{M}}$., ns) and thawed ($(mathbf{t}_{mathbf{T}}$, ns) states. It was approbated in the natural environment., on two sites in Central Yakutia. GPR data within the active layer during the period of complete freezing and thawing of rocks was examined. On the first testing site., data values were selected from a section segment in the vicinity of the check hole. The average value of the signal delay time from the reference boundary at a depth of 1.7 m was calculated based on three adjoining sounding locations. The relative change of the signal delay time $mathbf{N}_{mathbf{t}}$ was evaluated. The average gravimetric water content was calculated according to the proposed formula. Moisture distribution along the GPR section on the second approbation site was also determined in accordance with the methodology. The proposed methodology enables remote evaluation of dispersed rock moisture and its changes under the influence of various natural and anthropogenic factors within the active layer of the cryolithozone rock massif.
{"title":"Estimating Rock Moisture Based on Ground Penetration Radar Survey in Frozen and Thawed States","authors":"L. Fedorova, G. Kulyandin, D. Savvin","doi":"10.1109/ICGPR.2018.8441533","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441533","url":null,"abstract":"Possibilities of estimating rock moisture based on ground penetrating radar data were considered. A methodology for estimating moisture of dispersed rocks has been proposed which uses an empirical formula based on the relative change of delay time $(mathbf{N}_{mathrm{t}})$ of GPR signals reflected from the medium interface in the frozen ($(mathbf{t}_{mathbf{M}}$., ns) and thawed ($(mathbf{t}_{mathbf{T}}$, ns) states. It was approbated in the natural environment., on two sites in Central Yakutia. GPR data within the active layer during the period of complete freezing and thawing of rocks was examined. On the first testing site., data values were selected from a section segment in the vicinity of the check hole. The average value of the signal delay time from the reference boundary at a depth of 1.7 m was calculated based on three adjoining sounding locations. The relative change of the signal delay time $mathbf{N}_{mathbf{t}}$ was evaluated. The average gravimetric water content was calculated according to the proposed formula. Moisture distribution along the GPR section on the second approbation site was also determined in accordance with the methodology. The proposed methodology enables remote evaluation of dispersed rock moisture and its changes under the influence of various natural and anthropogenic factors within the active layer of the cryolithozone rock massif.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114587316","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441572
P. Koyan, J. Tronicke, N. Allroggen, A. Kathage, M. Willmes
Chloride-induced corrosion of steel is a key problem for reinforced concrete buildings such as bridges. Here, the moisture conditions are of major interest because they are closely related to chloridization and its tempo-spatial variability. Ground-penetrating radar (GPR) is commonly used for extensive non-destructive imaging of small-scale structural defects in concrete. To identify the potential and the limitations of GPR for practical investigation of reinforced concrete buildings, a longterm GPR monitoring experiment on a well-defined reinforced concrete specimen characterized by a typical rebar geometry has been performed under laboratory-like conditions. The GPR data analyzed in this study have been acquired before and after a three-week immersion of the specimen in water using a geometric setup and antenna system as commonly applied in concrete inspection. Before analyzing the data in detail, we apply a typical imaging processing flow and demonstrate the potential of our GPR data to image the spatial location of the rebar structures. To assess the moisture content of the specimen and its tempo-spatial variability, our study focuses on developing and performing an automatic migration-based velocity analysis, which also allows to estimate uncertainties in the derived velocities. Although analyzing single diffraction hyperbolas is not sufficient to resolve moisture changes in the range of a few percent, we are able to identify a mean temporal trend of increasing moisture content related to the immersion in water at two depth levels of the specimen. The observed trends and the estimated change of concrete moisture content are in good agreement with independent reference measurements. Our results demonstrate the resolvable limit of identifying moisture changes in typical reinforced concrete using GPR diffraction velocity analysis.
{"title":"Estimating moisture changes in concrete using GPR velocity analysis: potential and limitations","authors":"P. Koyan, J. Tronicke, N. Allroggen, A. Kathage, M. Willmes","doi":"10.1109/ICGPR.2018.8441572","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441572","url":null,"abstract":"Chloride-induced corrosion of steel is a key problem for reinforced concrete buildings such as bridges. Here, the moisture conditions are of major interest because they are closely related to chloridization and its tempo-spatial variability. Ground-penetrating radar (GPR) is commonly used for extensive non-destructive imaging of small-scale structural defects in concrete. To identify the potential and the limitations of GPR for practical investigation of reinforced concrete buildings, a longterm GPR monitoring experiment on a well-defined reinforced concrete specimen characterized by a typical rebar geometry has been performed under laboratory-like conditions. The GPR data analyzed in this study have been acquired before and after a three-week immersion of the specimen in water using a geometric setup and antenna system as commonly applied in concrete inspection. Before analyzing the data in detail, we apply a typical imaging processing flow and demonstrate the potential of our GPR data to image the spatial location of the rebar structures. To assess the moisture content of the specimen and its tempo-spatial variability, our study focuses on developing and performing an automatic migration-based velocity analysis, which also allows to estimate uncertainties in the derived velocities. Although analyzing single diffraction hyperbolas is not sufficient to resolve moisture changes in the range of a few percent, we are able to identify a mean temporal trend of increasing moisture content related to the immersion in water at two depth levels of the specimen. The observed trends and the estimated change of concrete moisture content are in good agreement with independent reference measurements. Our results demonstrate the resolvable limit of identifying moisture changes in typical reinforced concrete using GPR diffraction velocity analysis.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116089892","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441655
Isabel M. Morris, Branko Glišió, Andre Gonciar
Archaeological sites commonly use ground penetrating radar (GPR) as a subsurface archaeological prospection method that can increase the efficiency of archaeological operations. GPR surveys are overwhelmingly sensitive to variations in water content, soil type, and site-specific interference sources. This sensitivity is often neglected in archaeological geophysics applications in favor of collecting all GPR data on a site in the same conditions. GPR scans of a partially excavated Roman villa consisting of different construction materials and phases (limestone, andesite) in central Romania were collected in both dry (pre-rain) and wet (post-rain) conditions with a 500 MHz GPR antenna. Especially in time/depth slices, some subtle limestone features are clearer in the wet scans than the dry scans. Comparison of wet and dry scans via both qualitative visual interpretations and quantitative attribute analysis offers valuable information about features that are nearly invisible in standard conditions. Wet scans enhance the dielectric contrast between some materials, revealing features and unique insights about the site that are not available with scans collected in a single set of soil moisture conditions.
{"title":"Archaeological Ground Penetrating Radar Surveys Under Variable Soil Moisture: Visual and Numerical Results","authors":"Isabel M. Morris, Branko Glišió, Andre Gonciar","doi":"10.1109/ICGPR.2018.8441655","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441655","url":null,"abstract":"Archaeological sites commonly use ground penetrating radar (GPR) as a subsurface archaeological prospection method that can increase the efficiency of archaeological operations. GPR surveys are overwhelmingly sensitive to variations in water content, soil type, and site-specific interference sources. This sensitivity is often neglected in archaeological geophysics applications in favor of collecting all GPR data on a site in the same conditions. GPR scans of a partially excavated Roman villa consisting of different construction materials and phases (limestone, andesite) in central Romania were collected in both dry (pre-rain) and wet (post-rain) conditions with a 500 MHz GPR antenna. Especially in time/depth slices, some subtle limestone features are clearer in the wet scans than the dry scans. Comparison of wet and dry scans via both qualitative visual interpretations and quantitative attribute analysis offers valuable information about features that are nearly invisible in standard conditions. Wet scans enhance the dielectric contrast between some materials, revealing features and unique insights about the site that are not available with scans collected in a single set of soil moisture conditions.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123703778","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}
Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441529
D. Comite, F. Murgia, A. Galli, I. Catapano, F. Soldovieri
The imaging of buried targets by means of Ground Penetrating Radar (GPR) surveys is typically affected by nonideal and critical operational conditions. The targets are often located in the near-field region of the illuminating antennas, having size comparable to the probing wavelengths and, thus, to the resolution limits of the considered system. In this work, we investigate the improvements obtainable in the GPR performance when the post-processing of the signals collected at the receiving system accounts for the actual near-field distribution of a directional antenna used to activate the scattering phenomenon. In contrast with more conventional implementations., which are based on a two-dimensional (2-D) scalar representation of the scattering equation., we consider here a three-dimensional (3-D) vector formulation of the scattering problem, modeling the illuminating field with the actual 3-D near-field distribution impressed by the considered antennas. Preliminary 3-D numerical reconstructions of the target are reported and discussed, paving the way for a complete performance assessment of a fully vector near-field microwave imaging with respect to the usual simplified implementations.
{"title":"Advanced Three-Dimensional Microwave Tomography for the Imaging of Buried Targets","authors":"D. Comite, F. Murgia, A. Galli, I. Catapano, F. Soldovieri","doi":"10.1109/ICGPR.2018.8441529","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441529","url":null,"abstract":"The imaging of buried targets by means of Ground Penetrating Radar (GPR) surveys is typically affected by nonideal and critical operational conditions. The targets are often located in the near-field region of the illuminating antennas, having size comparable to the probing wavelengths and, thus, to the resolution limits of the considered system. In this work, we investigate the improvements obtainable in the GPR performance when the post-processing of the signals collected at the receiving system accounts for the actual near-field distribution of a directional antenna used to activate the scattering phenomenon. In contrast with more conventional implementations., which are based on a two-dimensional (2-D) scalar representation of the scattering equation., we consider here a three-dimensional (3-D) vector formulation of the scattering problem, modeling the illuminating field with the actual 3-D near-field distribution impressed by the considered antennas. Preliminary 3-D numerical reconstructions of the target are reported and discussed, paving the way for a complete performance assessment of a fully vector near-field microwave imaging with respect to the usual simplified implementations.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123872863","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}
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