Pub Date : 2018-06-01DOI: 10.1109/ICGPR.2018.8441576
L. Li, F. Long, T. Sun, Z. Han, X. Tang, W.Z. Ren
This paper combines the borehole ground penetrating radar imaging and digital optical borehole imaging, presents an efficient method to recognize and extract the structural planes parameters of rock mass. In this method, it's necessary to transform the digital optical image in color modeling. Processing such as segmentation and edge refinement are essential steps. Afterwards, matching algorithm is employed by using a transform of sinusoidal curve to extract the fitting parameters. Finally, the image feature data acquired by the borehole GPR image is integrated for verification. With this method, the physical and geometrical characteristics of the rock mass at and around the borehole can be revealed. It can effectively exert the respective characteristics of the two exploration technologies to identify the structural planes in a continuous and rapid way. It has proven highly reliable and efficient.
{"title":"Structural Planes Parameters Extraction Method Based on Borehole Digital Optical Image and GPR","authors":"L. Li, F. Long, T. Sun, Z. Han, X. Tang, W.Z. Ren","doi":"10.1109/ICGPR.2018.8441576","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441576","url":null,"abstract":"This paper combines the borehole ground penetrating radar imaging and digital optical borehole imaging, presents an efficient method to recognize and extract the structural planes parameters of rock mass. In this method, it's necessary to transform the digital optical image in color modeling. Processing such as segmentation and edge refinement are essential steps. Afterwards, matching algorithm is employed by using a transform of sinusoidal curve to extract the fitting parameters. Finally, the image feature data acquired by the borehole GPR image is integrated for verification. With this method, the physical and geometrical characteristics of the rock mass at and around the borehole can be revealed. It can effectively exert the respective characteristics of the two exploration technologies to identify the structural planes in a continuous and rapid way. It has proven highly reliable and efficient.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"27 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":"121520825","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.2018.8441586
Kazunori Takahashi, M. Loewer, J. Igel, C. Konishi
The coaxial transmission line measurement is the most common technique to measure the permittivity of granular materials in wideband. The technique measures S-parameters of a coaxial line filled with a material by vector network analyser. An analysis is required for determining the complex permittivity of the material from the measured S-parameters. The paper proposes a new analysis method, which uses finite difference time domain (FDTD) simulations as the forward modelling. The response of a coaxial line filled with a sample material is calculated by the FDTD method with exciting sine waves at different frequencies, and the frequency dependencies of permittivity and conductivity are determined by iteratively minimising the error between the measurement and modelling at each frequency. The paper demonstrates the method with some dielectric materials and discusses considerations for further developments.
{"title":"Determination of Complex Permittivity by Inverting Coaxial Transmission Line Data Using FDTD","authors":"Kazunori Takahashi, M. Loewer, J. Igel, C. Konishi","doi":"10.1109/ICGPR.2018.8441586","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441586","url":null,"abstract":"The coaxial transmission line measurement is the most common technique to measure the permittivity of granular materials in wideband. The technique measures S-parameters of a coaxial line filled with a material by vector network analyser. An analysis is required for determining the complex permittivity of the material from the measured S-parameters. The paper proposes a new analysis method, which uses finite difference time domain (FDTD) simulations as the forward modelling. The response of a coaxial line filled with a sample material is calculated by the FDTD method with exciting sine waves at different frequencies, and the frequency dependencies of permittivity and conductivity are determined by iteratively minimising the error between the measurement and modelling at each frequency. The paper demonstrates the method with some dielectric materials and discusses considerations for further developments.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"1 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":"129082713","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.2018.8441579
M. Dossi, E. Forte, M. Pipan
We study sampling-related amplitude distortions within aliasing-free GPR data sets, and compare them with other factors which can affect the recorded signal. In particular, we analyze how much the sampled peak amplitudes can change with different sampling rates., and recommend a minimum threshold for the sampling rate in order to contain the maximum peak amplitude error within acceptable limits. The selection of the sampling rate during data acquisition is commonly based on the Nyquist-Shannon theorem., which offers practical lower limits in order to avoid aliasing effects and to accurately preserve the spectral content of the original analog signal. However., we show that the Nyquist-Shannon theorem does not prevent possible amplitude distortions., and that significant and unrecoverable data loss can occur even in aliasing-free data sets. We also show that interpolation and re-sampling offer only limited solutions., since the accuracy of the reconstructed signal depends on the implemented interpolation method., while its subsequent resampling simply reintroduces the initial problem. Based on our analysis., we recommend using during data acquisition a sampling rate equal to at least 12 times the signal central frequency., which is higher than the commonly adopted standards., in order to limit the maximum peak amplitude error within 5%.
{"title":"Minimum threshold for the sampling rate to prevent amplitude distortions in aliasing-free GPR surveys","authors":"M. Dossi, E. Forte, M. Pipan","doi":"10.1109/ICGPR.2018.8441579","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441579","url":null,"abstract":"We study sampling-related amplitude distortions within aliasing-free GPR data sets, and compare them with other factors which can affect the recorded signal. In particular, we analyze how much the sampled peak amplitudes can change with different sampling rates., and recommend a minimum threshold for the sampling rate in order to contain the maximum peak amplitude error within acceptable limits. The selection of the sampling rate during data acquisition is commonly based on the Nyquist-Shannon theorem., which offers practical lower limits in order to avoid aliasing effects and to accurately preserve the spectral content of the original analog signal. However., we show that the Nyquist-Shannon theorem does not prevent possible amplitude distortions., and that significant and unrecoverable data loss can occur even in aliasing-free data sets. We also show that interpolation and re-sampling offer only limited solutions., since the accuracy of the reconstructed signal depends on the implemented interpolation method., while its subsequent resampling simply reintroduces the initial problem. Based on our analysis., we recommend using during data acquisition a sampling rate equal to at least 12 times the signal central frequency., which is higher than the commonly adopted standards., in order to limit the maximum peak amplitude error within 5%.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"106 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":"127571401","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.2018.8441541
Mezgeen A. Rasol, V. Pérez-Gracia, Sonia Santos Assunçño
Ground-Penetrating Radar (GPR) is a non-destructive geophysical method applied in many civil engineering applications. The knowledge of the GPR antennas behavior is crucial to obtain accurate results and comprehensive data interpretations. However, the age of the antennas and the use can modify the values provided by manufacturers. Consequently, calibration of antennas is recommended. Calibration involves determining several parameters. In this paper, the evaluation of two parameters (stability of the signal and zero-time position) and the analysis of the effects of stacking are presented. Three antennas characterized by nominal center frequencies of 500 MHz, 800 MHz and 1.6 GHz are analyzed. The direct wave was used for the stability analysis in two propagation media: air and concrete. The results of the stability evaluation seems to indicate that the emitted signal and the reconstruction of A-scans are quite stable and noise as consequence of electronic noise is low. Zero time position was measured in air, calculating the propagation time for the reflection on a metallic surface.
{"title":"Analysis and Calibration of Ground Penetrating Radar Shielded Antennas","authors":"Mezgeen A. Rasol, V. Pérez-Gracia, Sonia Santos Assunçño","doi":"10.1109/ICGPR.2018.8441541","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441541","url":null,"abstract":"Ground-Penetrating Radar (GPR) is a non-destructive geophysical method applied in many civil engineering applications. The knowledge of the GPR antennas behavior is crucial to obtain accurate results and comprehensive data interpretations. However, the age of the antennas and the use can modify the values provided by manufacturers. Consequently, calibration of antennas is recommended. Calibration involves determining several parameters. In this paper, the evaluation of two parameters (stability of the signal and zero-time position) and the analysis of the effects of stacking are presented. Three antennas characterized by nominal center frequencies of 500 MHz, 800 MHz and 1.6 GHz are analyzed. The direct wave was used for the stability analysis in two propagation media: air and concrete. The results of the stability evaluation seems to indicate that the emitted signal and the reconstruction of A-scans are quite stable and noise as consequence of electronic noise is low. Zero time position was measured in air, calculating the propagation time for the reflection on a metallic surface.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"9 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":"127660149","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.2018.8441668
Bella Wei-Yat Cheung, W. Lai
GPR has great potential in investigating water leak and water seepage because of its sensitivity to water. Given water as a dominant factor affecting reflection strength, wave propagation velocity of radar and absorption of high frequency part in spectral content for the non-metallic substance, thus this feature can be used to characterize water leak and seepage. This paper studies the phenomenon of subsurface water leak and demonstrates the experimental effort of pinpointing the water leaks of a buried water mains via a field-scale water leakage experiment in a designated site area (20m long × 10m wide) by analyzing change in GPR's wave propagation velocity. In the site, a ductile iron (D.I.) pipe with four displaced joints were buried and overlaid by concrete and paving blocks. Results obtained by IDS antenna with nominal center frequency of 600MHz were used to study and validate the effects of water leakage by velocity analysis based on [1]. The GPR wave propagation velocity analysis and imaging are based on the GPR data acquired before and after the water injection to map the location of leak points. With the reliable result attained from the velocity analysis, it is validated that the leak points of the pipe could be identified and verified by comparing the velocity profile and providing an accurate method for engineers to locate pipe leak.
{"title":"Field Validation of Water Pipe Leak by Spatial and Time-lapsed Measurement of GPR Wave Velocity","authors":"Bella Wei-Yat Cheung, W. Lai","doi":"10.1109/ICGPR.2018.8441668","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441668","url":null,"abstract":"GPR has great potential in investigating water leak and water seepage because of its sensitivity to water. Given water as a dominant factor affecting reflection strength, wave propagation velocity of radar and absorption of high frequency part in spectral content for the non-metallic substance, thus this feature can be used to characterize water leak and seepage. This paper studies the phenomenon of subsurface water leak and demonstrates the experimental effort of pinpointing the water leaks of a buried water mains via a field-scale water leakage experiment in a designated site area (20m long × 10m wide) by analyzing change in GPR's wave propagation velocity. In the site, a ductile iron (D.I.) pipe with four displaced joints were buried and overlaid by concrete and paving blocks. Results obtained by IDS antenna with nominal center frequency of 600MHz were used to study and validate the effects of water leakage by velocity analysis based on [1]. The GPR wave propagation velocity analysis and imaging are based on the GPR data acquired before and after the water injection to map the location of leak points. With the reliable result attained from the velocity analysis, it is validated that the leak points of the pipe could be identified and verified by comparing the velocity profile and providing an accurate method for engineers to locate pipe leak.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"43 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":"127679110","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.2018.8441562
Okci Mardoli, Ivan Ade Sofiyan, W. Parnadi
A GPR case study has been conducted in the Lodan Dam Area, Rembang, Indonesia. This area is located in a vulnerable area of land movement. The aim of this research is to reconstruct subsurface models which will be related to the distribution of fracture zones and landslides. The data acquisition is performed using a 3D GPR approach. The Lodan Dam area is divided into three segments, the upstream segment, the top of the dam segment, and the downstream segment. The profile results of the three segments use the amplitude response of the rocks. The response to amplitude values indicates the presence of a water-saturated zone. In addition, the GPR data profile of the subsurface model parameters is represented by a pseudo-3D representation. So that can be seen zone saturated water in each profile identify the existence of fracture zones or landslides in the subsurface. The water saturation zone affects the soil load from the crags on the hill. Thus, this existence triggers a crack in the drainage concrete.
{"title":"A GPR Case Study in The Lodan Dam Area, Rembang of Central Java","authors":"Okci Mardoli, Ivan Ade Sofiyan, W. Parnadi","doi":"10.1109/ICGPR.2018.8441562","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441562","url":null,"abstract":"A GPR case study has been conducted in the Lodan Dam Area, Rembang, Indonesia. This area is located in a vulnerable area of land movement. The aim of this research is to reconstruct subsurface models which will be related to the distribution of fracture zones and landslides. The data acquisition is performed using a 3D GPR approach. The Lodan Dam area is divided into three segments, the upstream segment, the top of the dam segment, and the downstream segment. The profile results of the three segments use the amplitude response of the rocks. The response to amplitude values indicates the presence of a water-saturated zone. In addition, the GPR data profile of the subsurface model parameters is represented by a pseudo-3D representation. So that can be seen zone saturated water in each profile identify the existence of fracture zones or landslides in the subsurface. The water saturation zone affects the soil load from the crags on the hill. Thus, this existence triggers a crack in the drainage concrete.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"1 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":"129936550","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.2018.8441556
T. Bechtel, G. Pochanin, S. Truskavetsky, M. Dimitri, V. Ruban, O. Orlenko, T. Byndych, A. Sherstyuk, K. Viatkin, F. Crawford, P. Falorni, A. Bulletti, L. Capineri
We are designing and building a multi-sensor semi-autonomous vehicle to assist in humanitarian demining in the Donbass conflict zone, Ukraine. The vehicle will carry impulse GPR for fast target detection, and holographic GPR for discrimination of mines from clutter. The design includes the possibility to add additional sensor. To ensure that the vehicle is compatible with actual Donbass conditions, the COTS dimensions of the selected vehicle (Clearpath Robotics “Jackal”), and relief profiles from two transects collected on the edge of the conflict zone, were compared using morphological filtering terrain analysis. The analysis shows that the vehicle can traverse the recorded transects with no threat of nose-in failure, and minimal threat of hang-up failure. Preliminary testing of the holographic radar mounted on the vehicle show that it can effectively image the footprint of mine-like targets, with resolution of a little more than one centimeter.
{"title":"Terrain Analysis in Eastern Ukraine and the Design of a Robotic Platform Carrying GPR Sensors for Landmine Detection","authors":"T. Bechtel, G. Pochanin, S. Truskavetsky, M. Dimitri, V. Ruban, O. Orlenko, T. Byndych, A. Sherstyuk, K. Viatkin, F. Crawford, P. Falorni, A. Bulletti, L. Capineri","doi":"10.1109/ICGPR.2018.8441556","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441556","url":null,"abstract":"We are designing and building a multi-sensor semi-autonomous vehicle to assist in humanitarian demining in the Donbass conflict zone, Ukraine. The vehicle will carry impulse GPR for fast target detection, and holographic GPR for discrimination of mines from clutter. The design includes the possibility to add additional sensor. To ensure that the vehicle is compatible with actual Donbass conditions, the COTS dimensions of the selected vehicle (Clearpath Robotics “Jackal”), and relief profiles from two transects collected on the edge of the conflict zone, were compared using morphological filtering terrain analysis. The analysis shows that the vehicle can traverse the recorded transects with no threat of nose-in failure, and minimal threat of hang-up failure. Preliminary testing of the holographic radar mounted on the vehicle show that it can effectively image the footprint of mine-like targets, with resolution of a little more than one centimeter.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"14 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":"122781200","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.2018.8441614
S. Shen, X.L. Hua, B. Zhou, Y.X. Li, W. Lu, Q. Liu, Y. C. Ji, G. Fang, L. Wang
Lunar Regolith Penetrating Radar (LRPR) is one payload of Lander for Chang'E-5. LRPR's scientific missions are: (1) providing information support for drill and sampling device; (2) sounding lunar regolith thickness and structure below the Lander area, which is covered by radar's antenna. In order to obtain detection data effectively, it is necessary to overcome the problem that the Lander cannot move. The LRPR uses an electric scanning method to traverse 12 antennas instead of the traditional detection mode. With the method, LRPR requires only one receiver and transmitter, thereby can effectively reduce weight and power consumption. LRPR is a time domain carrier-free pulse radar, which is compose of antenna array, electronic box and RF cable. It is shown that task requirements are met by confirmatory test of simulation Lunar Regolith on the round.
{"title":"Lunar Regolith Penetrating Radar on the Lander for Chang'E-5 Mission","authors":"S. Shen, X.L. Hua, B. Zhou, Y.X. Li, W. Lu, Q. Liu, Y. C. Ji, G. Fang, L. Wang","doi":"10.1109/ICGPR.2018.8441614","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441614","url":null,"abstract":"Lunar Regolith Penetrating Radar (LRPR) is one payload of Lander for Chang'E-5. LRPR's scientific missions are: (1) providing information support for drill and sampling device; (2) sounding lunar regolith thickness and structure below the Lander area, which is covered by radar's antenna. In order to obtain detection data effectively, it is necessary to overcome the problem that the Lander cannot move. The LRPR uses an electric scanning method to traverse 12 antennas instead of the traditional detection mode. With the method, LRPR requires only one receiver and transmitter, thereby can effectively reduce weight and power consumption. LRPR is a time domain carrier-free pulse radar, which is compose of antenna array, electronic box and RF cable. It is shown that task requirements are met by confirmatory test of simulation Lunar Regolith on the round.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"141 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":"116151057","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.2018.8441600
Y. Nomura, Takumi Narita, T. Sugiura, Yoshikazu Sudo
A synthetic aperture method for multi-static GPR was proposed: it enables a nonparametric reconstruction of upper surface periphery in the vertical section of buried objects by migrating line-elements. The line-elements are estimated by the following reflection principle. Let's assume two TX/RX antennas with different TX/RX distances: in this paper, one pair was assumed to be a monostatic antenna system, and the other, a bistatic antenna system. Then, the RX antenna of the two TX/RX antenna pairs can receive EM waves having reflected at “identical” object surface segments because each of the two TX/RX antenna pairs geometrically satisfy a mirror reflection condition at the object surface segments. Then, the surface segments shall be on a circle and an ellipse that satisfy a time-of-flight to primary wavefronts in two B-scan reflection images by monostatic and bi-static. Therefore, by exploring the minimal distance point between a circle and an ellipse, object surface segments can be estimated. The potential for practical use was confirmed through a field test using a flat plate, a roof-shaped plate and a pipe.
{"title":"Ellipse-inscribed line-element migration, ELM: a nonparametric object-periphery reconstruction method with multi-static GPR","authors":"Y. Nomura, Takumi Narita, T. Sugiura, Yoshikazu Sudo","doi":"10.1109/ICGPR.2018.8441600","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441600","url":null,"abstract":"A synthetic aperture method for multi-static GPR was proposed: it enables a nonparametric reconstruction of upper surface periphery in the vertical section of buried objects by migrating line-elements. The line-elements are estimated by the following reflection principle. Let's assume two TX/RX antennas with different TX/RX distances: in this paper, one pair was assumed to be a monostatic antenna system, and the other, a bistatic antenna system. Then, the RX antenna of the two TX/RX antenna pairs can receive EM waves having reflected at “identical” object surface segments because each of the two TX/RX antenna pairs geometrically satisfy a mirror reflection condition at the object surface segments. Then, the surface segments shall be on a circle and an ellipse that satisfy a time-of-flight to primary wavefronts in two B-scan reflection images by monostatic and bi-static. Therefore, by exploring the minimal distance point between a circle and an ellipse, object surface segments can be estimated. The potential for practical use was confirmed through a field test using a flat plate, a roof-shaped plate and a pipe.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"60 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":"126139872","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.2018.8441632
M. Manataki, A. Sarris, D. Oikonomou, K. Simirdanis, G. Strapazzon, P. Fernández
Under the framework suggested by STORM project for the conservation and protection of Cultural Heritage monuments, a GPR system equipped with 250MHz and 500MHz antennas was used at the pilot site of Fortezza, in the old town of Rethymno, to examine the capability of the method to detect both cracks and changes in wall thickness. The data presented here were collected in four different phases. The results suggest that both frequencies are capable to monitor changes in wall thickness, with the 250MHz antenna performing better than the 500MHz antenna. For the case of cracks, the 500MHz antenna produced more detailed results but due to high noise levels further processing is required. Overall, GPR seems to be a promising method in monitoring the conservation state of the walls.
{"title":"Contribution of GPR method in monitoring and evaluating the conservation state of Fortezza, Rethymno, Greece","authors":"M. Manataki, A. Sarris, D. Oikonomou, K. Simirdanis, G. Strapazzon, P. Fernández","doi":"10.1109/ICGPR.2018.8441632","DOIUrl":"https://doi.org/10.1109/ICGPR.2018.8441632","url":null,"abstract":"Under the framework suggested by STORM project for the conservation and protection of Cultural Heritage monuments, a GPR system equipped with 250MHz and 500MHz antennas was used at the pilot site of Fortezza, in the old town of Rethymno, to examine the capability of the method to detect both cracks and changes in wall thickness. The data presented here were collected in four different phases. The results suggest that both frequencies are capable to monitor changes in wall thickness, with the 250MHz antenna performing better than the 500MHz antenna. For the case of cracks, the 500MHz antenna produced more detailed results but due to high noise levels further processing is required. Overall, GPR seems to be a promising method in monitoring the conservation state of the walls.","PeriodicalId":269482,"journal":{"name":"2018 17th International Conference on Ground Penetrating Radar (GPR)","volume":"78 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":"126988229","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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