Pub Date : 2014-12-04DOI: 10.1109/ICGPR.2014.6970515
R. Solimene, A. Dell’Aversano, G. Leone
Rebar detection can be cast as a the problem of localizing point-like scatterers sparsely enclosed within a prescribed investigation domain. Both TR-MUSIC and Compressed Sensing approaches can deal with it and are compared in this paper. The role of noise on data, data sparseness and mutual coupling are examined by numerical examples.
{"title":"Rebar detection: Comparing MUSIC and COMPRESSED approaches","authors":"R. Solimene, A. Dell’Aversano, G. Leone","doi":"10.1109/ICGPR.2014.6970515","DOIUrl":"https://doi.org/10.1109/ICGPR.2014.6970515","url":null,"abstract":"Rebar detection can be cast as a the problem of localizing point-like scatterers sparsely enclosed within a prescribed investigation domain. Both TR-MUSIC and Compressed Sensing approaches can deal with it and are compared in this paper. The role of noise on data, data sparseness and mutual coupling are examined by numerical examples.","PeriodicalId":212710,"journal":{"name":"Proceedings of the 15th International Conference on Ground Penetrating Radar","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122720864","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 : 2014-12-04DOI: 10.1109/ICGPR.2014.6970476
V. Yavna, A. Hopersky, A. Nadolinsky, Z. Khakiev
The solution of the GPR inverse problem is considered in application to the context of linearly continuous quasi-homogeneous layers. A new implementation of the solution of Fredholm equation is proposed, allowing to extend the scope of the GPR method for evaluating the complex dielectric permittivity of a medium. The analytical and numerical methods based on Tikhonov regularization theory are developed for solving the Fredholm integral equation of the first kind (convolution) with respect to the required amplitude reflection coefficient. An algorithm is proposed to allocate the boundaries between linearly continuous quasi homogeneous ground layers. Theoretical calculations were performed in the approximation of non-polarized electromagnetic radiation. The quality of developed algorithm was tested by solving the inverse GPR problem for the model of three consecutive transparent non-absorbing layers and its solution is in good agreement with pre-known results.
{"title":"Solving the inverse problem of GPR for linearly continuous quasi-homogeneous layers","authors":"V. Yavna, A. Hopersky, A. Nadolinsky, Z. Khakiev","doi":"10.1109/ICGPR.2014.6970476","DOIUrl":"https://doi.org/10.1109/ICGPR.2014.6970476","url":null,"abstract":"The solution of the GPR inverse problem is considered in application to the context of linearly continuous quasi-homogeneous layers. A new implementation of the solution of Fredholm equation is proposed, allowing to extend the scope of the GPR method for evaluating the complex dielectric permittivity of a medium. The analytical and numerical methods based on Tikhonov regularization theory are developed for solving the Fredholm integral equation of the first kind (convolution) with respect to the required amplitude reflection coefficient. An algorithm is proposed to allocate the boundaries between linearly continuous quasi homogeneous ground layers. Theoretical calculations were performed in the approximation of non-polarized electromagnetic radiation. The quality of developed algorithm was tested by solving the inverse GPR problem for the model of three consecutive transparent non-absorbing layers and its solution is in good agreement with pre-known results.","PeriodicalId":212710,"journal":{"name":"Proceedings of the 15th International Conference on Ground Penetrating Radar","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128083308","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 : 2014-12-04DOI: 10.1109/ICGPR.2014.6970583
S. Ivashov, V. Razevig, I. Vasiliev, V. Shitikov, T. Bechtel, L. Capineri
Analysis of critical conditions on the spacecrafts Columbia (USA), and the Buran (Russia) related to defects in insulation and heat-protection coatings have been performed. It is shown that the existing methods of non-destructive testing, including ultrasound, failed to prevent the disaster of the Space Shuttle Columbia and serious incidents involving spacecraft Buran during its only flight. A new method for using the holographic subsurface radar RASCAN-5/15000 which reveals the internal defects of the coating was proposed and experiments on models of thermal insulation coatings were performed. The experimental results were displayed in the form of radar images on which defects in the heat insulation provided a good contrast.
{"title":"Diagnostics of thermal insulation and heat protection coating of space ships and rockets by holographic subsurface radar","authors":"S. Ivashov, V. Razevig, I. Vasiliev, V. Shitikov, T. Bechtel, L. Capineri","doi":"10.1109/ICGPR.2014.6970583","DOIUrl":"https://doi.org/10.1109/ICGPR.2014.6970583","url":null,"abstract":"Analysis of critical conditions on the spacecrafts Columbia (USA), and the Buran (Russia) related to defects in insulation and heat-protection coatings have been performed. It is shown that the existing methods of non-destructive testing, including ultrasound, failed to prevent the disaster of the Space Shuttle Columbia and serious incidents involving spacecraft Buran during its only flight. A new method for using the holographic subsurface radar RASCAN-5/15000 which reveals the internal defects of the coating was proposed and experiments on models of thermal insulation coatings were performed. The experimental results were displayed in the form of radar images on which defects in the heat insulation provided a good contrast.","PeriodicalId":212710,"journal":{"name":"Proceedings of the 15th International Conference on Ground Penetrating Radar","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133490859","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 : 2014-12-04DOI: 10.1109/ICGPR.2014.6970494
Fei Wang, Sixin Liu, Xinxin Qu
We presented a ray-based iteratively traveltime tomography algorithm for crosshole radar direct-arrival data using the multistencils fast marching method (MSFM). The proposed scheme used MSFM to compute the traveltime solution at each grid point by solving the traveltime eikonal equation along several stencils and picked the solution that satisfies the upwind condition. Curved raypaths, which were needed for the construction of the Jacobi matrix during inversion, were generated using the steepest descent technique. The solutions were achieved by an iteratively linearized inversion approach. We tested the suggested method on three synthetic data sets and a field data set. The reconstruction results indicated that the MSFM algorithm is very suitable for crosshole radar traveltime tomography and the proposed scheme is considered to be an efficient crosshole radar traveltime tomography technique.
{"title":"Ray-based crosshole radar traveltime tomography using MSFM method","authors":"Fei Wang, Sixin Liu, Xinxin Qu","doi":"10.1109/ICGPR.2014.6970494","DOIUrl":"https://doi.org/10.1109/ICGPR.2014.6970494","url":null,"abstract":"We presented a ray-based iteratively traveltime tomography algorithm for crosshole radar direct-arrival data using the multistencils fast marching method (MSFM). The proposed scheme used MSFM to compute the traveltime solution at each grid point by solving the traveltime eikonal equation along several stencils and picked the solution that satisfies the upwind condition. Curved raypaths, which were needed for the construction of the Jacobi matrix during inversion, were generated using the steepest descent technique. The solutions were achieved by an iteratively linearized inversion approach. We tested the suggested method on three synthetic data sets and a field data set. The reconstruction results indicated that the MSFM algorithm is very suitable for crosshole radar traveltime tomography and the proposed scheme is considered to be an efficient crosshole radar traveltime tomography technique.","PeriodicalId":212710,"journal":{"name":"Proceedings of the 15th International Conference on Ground Penetrating Radar","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133947316","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 : 2014-12-04DOI: 10.1109/ICGPR.2014.6970413
F. André, M. Jonard, S. Lambot
Forest soil organic horizons constitute a major component of forest ecosystems and their accurate characterization is of prime importance for ecological studies as well as for carbon cycle and global change related studies. In other respects, the presence of forest litter is known to influence remote sensing radar data over forested areas and precise determination of litter radiative properties is necessary for proper processing of these data. In the present study, ultra wideband (0.8-4.0 GHz) ground-penetrating radar (GPR) data were collected above the forest floor of a beech forest with different litter layer thicknesses so as to examine the effect of litter on the backscattered radar signal and to investigate the potentialities of GPR for reconstructing litter constitutive properties. Full-wave inversion was used to process the radar data. Attenuation of the radar signal was found to increase as both operating frequency and litter thickness increase, as a result of the occurrence of dielectric and scattering losses within litter. Frequency dependence of the apparent electrical conductivity of litter was considered in the radar model to account for these phenomena. Close correspondence was observed between estimated and measured litter thicknesses and signal inversions provided reliable estimates of litter electromagnetic properties. These results show promising potentialities of the GPR technique for providing accurate and non-invasive characterization of forest litter.
{"title":"Full-wave inversion of ground-penetrating radar data for forest litter characterization","authors":"F. André, M. Jonard, S. Lambot","doi":"10.1109/ICGPR.2014.6970413","DOIUrl":"https://doi.org/10.1109/ICGPR.2014.6970413","url":null,"abstract":"Forest soil organic horizons constitute a major component of forest ecosystems and their accurate characterization is of prime importance for ecological studies as well as for carbon cycle and global change related studies. In other respects, the presence of forest litter is known to influence remote sensing radar data over forested areas and precise determination of litter radiative properties is necessary for proper processing of these data. In the present study, ultra wideband (0.8-4.0 GHz) ground-penetrating radar (GPR) data were collected above the forest floor of a beech forest with different litter layer thicknesses so as to examine the effect of litter on the backscattered radar signal and to investigate the potentialities of GPR for reconstructing litter constitutive properties. Full-wave inversion was used to process the radar data. Attenuation of the radar signal was found to increase as both operating frequency and litter thickness increase, as a result of the occurrence of dielectric and scattering losses within litter. Frequency dependence of the apparent electrical conductivity of litter was considered in the radar model to account for these phenomena. Close correspondence was observed between estimated and measured litter thicknesses and signal inversions provided reliable estimates of litter electromagnetic properties. These results show promising potentialities of the GPR technique for providing accurate and non-invasive characterization of forest litter.","PeriodicalId":212710,"journal":{"name":"Proceedings of the 15th International Conference on Ground Penetrating Radar","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132286724","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 : 2014-12-04DOI: 10.1109/ICGPR.2014.6970503
Haewon Jung, Kangwook Kim, Dong Kyoo Kim, Jin-Myung Kim
In the pavement inspection ground-penetrating radar system, the antenna array is mounted on a vehicle, which moves at a high speed. To image the pavement, the data in the frequency domain need to be processed rapidly on a digital signal processor (DSP). The DSP can be made to operate at a higher speed when the processing is based on a fixed-point data type. In this paper, the responses from far targets are shown to suffer from precision loss when they are processed on a fixed-point data type. A compensation filter to prevent the precision loss is presented. The filter is applied in the frequency domain before the time-domain transformation. The filter is applied to the measured data using ultra-wideband radar and shown to generate clear images of both near and far targets.
{"title":"DSP implementation of rapid imaging of data obtained from UWB radar for use in a pavement inspection GPR system","authors":"Haewon Jung, Kangwook Kim, Dong Kyoo Kim, Jin-Myung Kim","doi":"10.1109/ICGPR.2014.6970503","DOIUrl":"https://doi.org/10.1109/ICGPR.2014.6970503","url":null,"abstract":"In the pavement inspection ground-penetrating radar system, the antenna array is mounted on a vehicle, which moves at a high speed. To image the pavement, the data in the frequency domain need to be processed rapidly on a digital signal processor (DSP). The DSP can be made to operate at a higher speed when the processing is based on a fixed-point data type. In this paper, the responses from far targets are shown to suffer from precision loss when they are processed on a fixed-point data type. A compensation filter to prevent the precision loss is presented. The filter is applied in the frequency domain before the time-domain transformation. The filter is applied to the measured data using ultra-wideband radar and shown to generate clear images of both near and far targets.","PeriodicalId":212710,"journal":{"name":"Proceedings of the 15th International Conference on Ground Penetrating Radar","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132339938","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 : 2014-12-04DOI: 10.1109/ICGPR.2014.6970542
V. Paraforou, D. Caratelli, D. Tran
We report an advanced mathematical method featuring both antenna miniaturization and bandwidth enhancement for super wideband (SWB) antennas intended for advanced GPR applications. By implementing the supershape formula a wide range of practical antenna shapes can be described by just three design parameters, facilitating a lot the optimum antenna design. As a proof-of-concept, a PCB-based, balanced-fed antenna is presented and demonstrated. Our antenna design exhibits SWB characteristics since it operates in the frequency range 0.48 - 10.2GHz meeting the trade-off requirements for depth penetration and range resolution. Additionally, the employed floated ground plane yields a unidirectional broadside radiation pattern making the use of shielding and absorbing cavity unnecessary. Pattern stability is observed over the whole operating frequency range. In time-domain, a low pulse late-time ringing was achieved through the radiator shape optimization and the thin absorbing layer introduction as resistive loading method.
{"title":"A novel low-profile SWB unidirectional supershaped antenna for advanced ground penetrating radar applications","authors":"V. Paraforou, D. Caratelli, D. Tran","doi":"10.1109/ICGPR.2014.6970542","DOIUrl":"https://doi.org/10.1109/ICGPR.2014.6970542","url":null,"abstract":"We report an advanced mathematical method featuring both antenna miniaturization and bandwidth enhancement for super wideband (SWB) antennas intended for advanced GPR applications. By implementing the supershape formula a wide range of practical antenna shapes can be described by just three design parameters, facilitating a lot the optimum antenna design. As a proof-of-concept, a PCB-based, balanced-fed antenna is presented and demonstrated. Our antenna design exhibits SWB characteristics since it operates in the frequency range 0.48 - 10.2GHz meeting the trade-off requirements for depth penetration and range resolution. Additionally, the employed floated ground plane yields a unidirectional broadside radiation pattern making the use of shielding and absorbing cavity unnecessary. Pattern stability is observed over the whole operating frequency range. In time-domain, a low pulse late-time ringing was achieved through the radiator shape optimization and the thin absorbing layer introduction as resistive loading method.","PeriodicalId":212710,"journal":{"name":"Proceedings of the 15th International Conference on Ground Penetrating Radar","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134591221","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 : 2014-12-04DOI: 10.1109/ICGPR.2014.6970507
A. Popov, I. Prokopovich, V. Kopeikin, D. Edemskij
The capabilities of subsurface microwave holography are limited by mutually contradicting factors, such as penetration depth, surface reflection, and spatial resolution. As a result of the trade-off, the wavelength at the operating frequency is comparable to the typical target sizes and is not small compared with the antenna array dimensions and probing range. In order to comprehend microwave image formation by a planar holographic antenna array we apply Fresnel-Kirchhoff diffraction theory uniformly treating target illumination, incident wave scattering, holographic data acquisition, and object reconstruction by means of numerical wave front conversion. Within the framework of narrow-angle diffraction model we derive an integral operator directly transforming the planar test object into its diffraction-limited image. The action of this operator is readily revealed by applying Fourier transform with respect to the transversal coordinates: it cuts from the target spatial spectrum a rectangular segment centered according to the illumination angle. The theory shows that for a successful object reconstruction the acquired rectangle must cover the significant part of the target spatial spectrum. If the antenna aperture is too small to meet this condition, synthetic aperture approach can be successfully used. Such a multiview-multistatic measurement scheme realized by moving the radiator around the fixed receiver antenna array may considerably improve the radar imaging performance - cf. [1]. This conclusion was confirmed by numerical simulation and physical experiment.
{"title":"Spectral theory of microwave holographic image formation","authors":"A. Popov, I. Prokopovich, V. Kopeikin, D. Edemskij","doi":"10.1109/ICGPR.2014.6970507","DOIUrl":"https://doi.org/10.1109/ICGPR.2014.6970507","url":null,"abstract":"The capabilities of subsurface microwave holography are limited by mutually contradicting factors, such as penetration depth, surface reflection, and spatial resolution. As a result of the trade-off, the wavelength at the operating frequency is comparable to the typical target sizes and is not small compared with the antenna array dimensions and probing range. In order to comprehend microwave image formation by a planar holographic antenna array we apply Fresnel-Kirchhoff diffraction theory uniformly treating target illumination, incident wave scattering, holographic data acquisition, and object reconstruction by means of numerical wave front conversion. Within the framework of narrow-angle diffraction model we derive an integral operator directly transforming the planar test object into its diffraction-limited image. The action of this operator is readily revealed by applying Fourier transform with respect to the transversal coordinates: it cuts from the target spatial spectrum a rectangular segment centered according to the illumination angle. The theory shows that for a successful object reconstruction the acquired rectangle must cover the significant part of the target spatial spectrum. If the antenna aperture is too small to meet this condition, synthetic aperture approach can be successfully used. Such a multiview-multistatic measurement scheme realized by moving the radiator around the fixed receiver antenna array may considerably improve the radar imaging performance - cf. [1]. This conclusion was confirmed by numerical simulation and physical experiment.","PeriodicalId":212710,"journal":{"name":"Proceedings of the 15th International Conference on Ground Penetrating Radar","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115030026","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 : 2014-12-04DOI: 10.1109/ICGPR.2014.6970470
E. R. Almeida, J. Porsani, I. Catapano, G. Gennarelli, F. Soldovieri
GPR has been used worldwide to help the police enforcement to search for missing bodies. In this paper, microwave tomography is considered as an advanced data processing technique in order to enhance the visualization and thus improve the interpretation of GPR images for forensic purposes. In particular, we discuss on an experiment that was carried out by using a pig to simulate a human body buried in a tropical environment. A system equipped with 270 MHz and 900 MHz antennas was used to survey the area. The microwave tomography approach applied to the 270 MHz data allowed to get a good identification of the edges of the target, as well as to determine its position in the area of the experiment. The tomographic reconstruction of 900 MHz data allowed a better visualization of the grave itself.
{"title":"GPR data analysis enhanced by microwave tomography for forensic archaeology","authors":"E. R. Almeida, J. Porsani, I. Catapano, G. Gennarelli, F. Soldovieri","doi":"10.1109/ICGPR.2014.6970470","DOIUrl":"https://doi.org/10.1109/ICGPR.2014.6970470","url":null,"abstract":"GPR has been used worldwide to help the police enforcement to search for missing bodies. In this paper, microwave tomography is considered as an advanced data processing technique in order to enhance the visualization and thus improve the interpretation of GPR images for forensic purposes. In particular, we discuss on an experiment that was carried out by using a pig to simulate a human body buried in a tropical environment. A system equipped with 270 MHz and 900 MHz antennas was used to survey the area. The microwave tomography approach applied to the 270 MHz data allowed to get a good identification of the edges of the target, as well as to determine its position in the area of the experiment. The tomographic reconstruction of 900 MHz data allowed a better visualization of the grave itself.","PeriodicalId":212710,"journal":{"name":"Proceedings of the 15th International Conference on Ground Penetrating Radar","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117307709","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 : 2014-12-04DOI: 10.1109/ICGPR.2014.6970480
N. Diamanti, A. P. Annan, J. Redman
Detecting subsurface media interfaces is a common practice for most geophysical methods and more specifically ground penetrating radar (GPR). In the majority of GPR applications, the boundaries of these interfaces are assumed to be sharp. Quite often interfaces are gradational and are difficult to detect and consequently map. Previous work has mainly focused on more simplistic one-dimensional modelling. In this paper, we employ three-dimensional (3D) finite-difference time-domain (FDTD) numerical modelling to address this problem. We examine the impact of a gradational zone in electrical properties (conductivity and/or relative permittivity) between underlying layers on GPR signals. The thickness of this transition zone and the GPR operating frequency have a significant impact on the GPR reflected wavelet amplitude and character.
{"title":"Impact of gradational electrical properties on GPR detection of interfaces","authors":"N. Diamanti, A. P. Annan, J. Redman","doi":"10.1109/ICGPR.2014.6970480","DOIUrl":"https://doi.org/10.1109/ICGPR.2014.6970480","url":null,"abstract":"Detecting subsurface media interfaces is a common practice for most geophysical methods and more specifically ground penetrating radar (GPR). In the majority of GPR applications, the boundaries of these interfaces are assumed to be sharp. Quite often interfaces are gradational and are difficult to detect and consequently map. Previous work has mainly focused on more simplistic one-dimensional modelling. In this paper, we employ three-dimensional (3D) finite-difference time-domain (FDTD) numerical modelling to address this problem. We examine the impact of a gradational zone in electrical properties (conductivity and/or relative permittivity) between underlying layers on GPR signals. The thickness of this transition zone and the GPR operating frequency have a significant impact on the GPR reflected wavelet amplitude and character.","PeriodicalId":212710,"journal":{"name":"Proceedings of the 15th International Conference on Ground Penetrating Radar","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115007006","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：