2012 14th International Conference on Ground Penetrating Radar (GPR)最新文献

{"title":"An automatic algorithm for multi-defect classification inside tunnel using SVM","authors":"L. Xiang, Huilin Zhou, Si-hao Tan","doi":"10.1109/ICGPR.2012.6254908","DOIUrl":"https://doi.org/10.1109/ICGPR.2012.6254908","url":null,"abstract":"An integrated framework is presented in this paper to automatically achieve rebar detection and defection classification inside tunnel. This framework is composed of GPR return preprocessing to perform clutter reduction, a Frequency-wavenumber migration algorithm to focus the hyperbola, an energy scanning method to extract the region of interest(ROI) and to achieve rebar detection, and a multi-class support vector machine(SVM)to classify various types of defection inside tunnel. The experimental results based on simulated data show that the presented framework can automatically and effectively perform rebar detection and defection classification.","PeriodicalId":443640,"journal":{"name":"2012 14th International Conference on Ground Penetrating Radar (GPR)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123564834","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}

{"title":"Accurate thickness estimation of a backfill grouting layer behind shield tunnel lining by CMP measurement using GPR","authors":"Hai Liu, Xiongyao Xie, Motoyuki Sato","doi":"10.1109/ICGPR.2012.6254848","DOIUrl":"https://doi.org/10.1109/ICGPR.2012.6254848","url":null,"abstract":"The distribution of a backfill grouting layer behind concrete lining of a shield tunnel is important for evaluation of its stability. In this paper, we proposed to use Common Mid-Point (CMP) method by Ground Penetrating Radar (GPR) to estimate the dielectric permittivity and thickness of the backfill grouting layer. We developed a CMP measurement system with two designed bowtie antennas. Field experiments were carried out in two shield tunnels in Shanghai, China in January 2012. One is the Yangzi River tunnel under operation and the other is the Changjiang Road tunnel under construction. Two datasets were acquired in each tunnel. Frequency wavenumber (FK) filter was applied to suppress the coherent clutter and enhance the hyperbolic reflection signal. A new algorithm of envelope velocity spectrum analysis was proposed for accurate estimation of dielectric permittivity and thickness of the grouting layer from processed CMP profiles. Both the grouting layers behind the tunnel under operation and that under construction can be clearly estimated. The thickness of grouting layer behind the investigated two segments in Yangzi River tunnel were respectively estimated to be 16 cm and 17 cm, a little less than the designed thickness of 20cm. In addition, air void was discovered inside the grouting layer behind one of the lining in Changjiang Road tunnel. This technique provides important information for evaluation of the safety of a tunnel, mitigation of the risk of ground settlement.","PeriodicalId":443640,"journal":{"name":"2012 14th International Conference on Ground Penetrating Radar (GPR)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123949900","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}

{"title":"Airborne GPR surveys via tomographic imaging: An analysis of the reconstruction capabilities","authors":"I. Catapano, L. Crocco, F. Soldovieri, R. Lanari, G. Alberti, D. Adirosi, C. Facchinetti, F. Longo, R. Formaro, R. Persico","doi":"10.1109/ICGPR.2012.6254880","DOIUrl":"https://doi.org/10.1109/ICGPR.2012.6254880","url":null,"abstract":"GPR systems installed on helicopters or spotter planes represent effective monitoring tools to cover surface and underground characterization of wide areas. In this respect, the paper discusses the on field reconstruction capabilities resulting from the joint exploitation of a novel sounder system and an advanced data processing approach. The sounder system was built by CORISTA in collaboration with the Italian Space Agency, which promoted and founded the project. It is a pulsed radar working at 163 MHz and transmits a 10 MHz linearly frequency modulated signal (chirp) by using DDS (Direct Digital Synthesizer) technique. The transmitted peak power is about 200W over a 3μsec pulse length. The system exploits a log periodic antenna with four elements, GPS and an INS are used for storing position and attitude information. The data processing is faced by means of a microwave tomographic reconstruction approach, which is based on a simplified scattering model. In particular the Born approximation is adopted to formulate the imaging as a linear inverse scattering problem. The effectiveness of the system is shown by means of the tomographic images corresponding to the first trial surveys made with the sounder installed on a helicopter of the Italian Air Force.","PeriodicalId":443640,"journal":{"name":"2012 14th International Conference on Ground Penetrating Radar (GPR)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124394891","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}

{"title":"Generalized Hough Transform and ANN for subsurface cylindrical object location and parameters inversion from GPR data","authors":"Wei Li, Huilin Zhou, X. Wan","doi":"10.1109/ICGPR.2012.6254874","DOIUrl":"https://doi.org/10.1109/ICGPR.2012.6254874","url":null,"abstract":"Targets location and parameter inversion are always active research field of Ground Penetrating Radar (GPR) and useful to address some challenges in civil and military applications. Since the amplitude and delay of receiving signal could correspondingly change due to varying of the dimension, and material of targets, permittivity of background. So, in this paper, we present a new framework integrated Generalized Hough Transform (GHT) with neural network to reconstruct their non-linear relationship and implement targets location and parameter inversion. The results based on simulated data demonstrate the high accuracy.","PeriodicalId":443640,"journal":{"name":"2012 14th International Conference on Ground Penetrating Radar (GPR)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121563715","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}

{"title":"GPR diagnosis of historical and cultural objects","authors":"E. Zverev, A. Urusova, Andrey Ivanov, Maxim Shiribokov","doi":"10.1109/ICGPR.2012.6254938","DOIUrl":"https://doi.org/10.1109/ICGPR.2012.6254938","url":null,"abstract":"In this article the authors propose to cover some issues related to methods of GPR survey and data processing and also to demonstrate some results obtained during survey of archeological, historical and cultural objects.","PeriodicalId":443640,"journal":{"name":"2012 14th International Conference on Ground Penetrating Radar (GPR)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125180073","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}

{"title":"Application of Ground Penetrating Radar to detect orientation of cavities and caverns developed due to tectonic implication in Baratang Island, Middle Andaman, India","authors":"N. Ramanujam, P. Prasad, A. Vignesh, S. Murti, Q. A. Rasool, K. B. Swapan, C. Ojha, A. J. Boopalan, P. Yuvaraj","doi":"10.1109/ICGPR.2012.6254977","DOIUrl":"https://doi.org/10.1109/ICGPR.2012.6254977","url":null,"abstract":"Ground Penetrating Radar (GPR) is an effective tool to detect small (<; 10m diameter) caves and fissures in karst terrain. 170 caves have been identified within 1 km2 area in uplifted carbonate rocks in Baratang Island of Middle Andaman. Due to oblique subduction of Indian plate with Burmese plate in NW part of Andaman induced NE- SW and NW- SE trending sutures. The Study aims to validate the orientation of the fault patterns in carbonate rocks through Ground Penetrating Radar. To conduct GPR surveys two cave sites 400 m apart are selected. GPR - SIR-3000 instrument with dipole antenna in bistatic arrangement in reflection mode with stationary point mode is employed. Four depth (time) slices computed from the transect data for 40 MHz antenna with 500 ns range reflected across the cave No. 1 to a length of 19 m reveal bright linear features and intense spots positioned at the depths of 3 m and below 11 m to 18 m and vertical shaft connecting discontinuities are traced to 25 m depth in all plots. Five depth slices at an interval of 4.0 m to a total distance of 28 m with 40 MHz antenna with 400 ns have reflected bright regions at the depths from 8.5 m to 12.5 m and scanning up to depth of 20 m in cave No.2. Seven depth slices by using the 80 MHz antenna with time window of 250 ns across the cave No.2 have reflected to 12.5 m depth, show bright regions with high resolutions at the depth range of 8.5 to 12.5 m. Increase of antenna frequencies with lowering of time range has resolved high resolution reflections of cavities, cracks and reduction of depth in the cave No. 2 than the in cave No. 1. Induction of cracks and fissures in carbonate rocks due to erstwhile tectonic repercussion were subsequently increased their sizes through rain water percolation and dissolution. Depth (time) slices of GPR in all transects across the cave orientations in two sites proved that continuation of caves are aligned in NW-SE and NE-SW directions.","PeriodicalId":443640,"journal":{"name":"2012 14th International Conference on Ground Penetrating Radar (GPR)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125268274","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}

{"title":"Propagation characteristics of joint physical simulation of both electromagnetic wave and ultrasonic wave in fractured media model","authors":"Qiao Wang, Xuan Feng, Q. Lu, Cai Liu, Wenjing Liang, Lilong Zou, Hong-Li Li, Yue Yu","doi":"10.1109/ICGPR.2012.6254996","DOIUrl":"https://doi.org/10.1109/ICGPR.2012.6254996","url":null,"abstract":"Fractured reservoir plays an important role in exploitation of the oil-gas recourses especially shale gas, at the same time the fractures have an important influence on the dams, bridges, highways and other builds. So fracture detection and its attribute evaluation is an important aim on study of exploration geophysics. Both electromagnetic wave and elastic wave have a good effect on fracture detection and its attribute evaluation. Joint exploration and inversion is an effective way to improve the accuracy of exploration. But we needs further study on the propagation response characteristics of electromagnetic wave and elastic wave. Physical simulation is an intuitionistic and effective method in study two kinds of wave-field propagation response characteristics in fractured media. So we carry out the combining electromagnetic wave and ultrasonic wave physical simulation experiment on fractured medium model. We have established a three-dimensional physical model with a series of tiny parallel fractures in the vertical. And we have explored this model using by ground penetrating radar, and collected electromagnetic sounding data of three-dimensional co-polarization and cross-polarization, and analysed polarization characteristics. At the same time we have explored this model using three-component transducer, and collected elastic wave data of three-dimensional, and analysed shear wave propagation characteristics. By making a study of the change of co-polarization and cross-polarization response amplitude values and the phenomenon of S-wave splitting in elastic wave, we can judge the direction and density of cracks and other properties in it. By study of the two kinds of wave-field physical simulation, we can lay a solid foundation for joint inversion of electromagnetic wave and ultrasonic wave in the future.","PeriodicalId":443640,"journal":{"name":"2012 14th International Conference on Ground Penetrating Radar (GPR)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128221520","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}

{"title":"Array processing for underground tunnel detection","authors":"P. Xie, S. Grant, N. Putnam, N. Anderson, A. Nasseri-Moghaddam","doi":"10.1109/ICGPR.2012.6254929","DOIUrl":"https://doi.org/10.1109/ICGPR.2012.6254929","url":null,"abstract":"This paper investigates challenges faced by many geophysical algorithms applied to real-world cases such as the Attenuation Analysis of Rayleigh Waves (AARW). AARW shows great promise in terms of detecting shallow underground tunnels. However, in-situ subsurface anomalies, including those due to anisotropy, and instrument sensitivity to natural conditions can significantly degrade the utility of this technique. The first applied measure estimates the confidence level of each detection result. The second processes the recorded data in sub-arrays, acting as a filter to remove false alarms. The third scans all detections and searches the cluster with the highest cumulative confidence level. A case study is presented to demonstrate the effectiveness of AARW along with post-processing quality control measures. This work provides engineering practitioners with a simple and efficient method to reliably determine tunnel locations.","PeriodicalId":443640,"journal":{"name":"2012 14th International Conference on Ground Penetrating Radar (GPR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128591151","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}

{"title":"The numerical simulation study on ground penetrating radar detection of the typical adverse geological structure","authors":"Rao Hu, Lixun Lu, Shuiqiang Wang","doi":"10.1109/ICGPR.2012.6254868","DOIUrl":"https://doi.org/10.1109/ICGPR.2012.6254868","url":null,"abstract":"According to the shape and electrical parameters of common karst and fractured zone, this paper established a number of karst cave model with different filler and fractured zone model with different degree of crushing. Numerical simulations of radar wave propagation in different models have been conducted, using the finite difference time domain (FDTD) simulation method with the perfectly matched layer (PML) absorbing boundary conditions for these attenuation models. The characteristics on simulated GPR profile of different models have been summarized. The numerical simulation results will be a good guide to GPR data processing and interpretation. Finally, a project example was introduced to further prove the reliability of simulation results.","PeriodicalId":443640,"journal":{"name":"2012 14th International Conference on Ground Penetrating Radar (GPR)","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128831802","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}

{"title":"An automatic framework using space-time processing and TR-MUSIC for subsurface imaging","authors":"Si-hao Tan, Huilin Zhou, L. Xiang","doi":"10.1109/ICGPR.2012.6254875","DOIUrl":"https://doi.org/10.1109/ICGPR.2012.6254875","url":null,"abstract":"In this paper, we present an automatic framework combined space-time signal processing with Time Reversal electromagnetic (EM) inversion for subsurface multi-target imaging using Ground Penetrating Radar (GPR). This framework is composed of a Frequency-Wavenumber (FK) filter to suppress direct wave and ground bounce, a FK migration algorithm to automatically estimate the number of targets and identify target regions, which can be used to reduce the computational complexity of the following imaging algorithm, and a EM inversion algorithm using Time Reversal Multiple Signal Classification (TR-MUSIC) to reconstruct subsurface target. The feasibility of the framework is demonstrated with simulated data generated by GPRMAX.","PeriodicalId":443640,"journal":{"name":"2012 14th International Conference on Ground Penetrating Radar (GPR)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130788752","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}