2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR)最新文献_第9页

Development of multi-path linear array radar at 10–20GHz 10-20GHz多径线阵雷达的研制

2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR) Pub Date : 2015-07-07 DOI: 10.1109/IWAGPR.2015.7292654

Yasunari Mori, Yumi Asano, Takayoshi Yumii, K. Doi, Kazunori Takahashi, Motoyuki Sato

{"title":"Development of multi-path linear array radar at 10–20GHz","authors":"Yasunari Mori, Yumi Asano, Takayoshi Yumii, K. Doi, Kazunori Takahashi, Motoyuki Sato","doi":"10.1109/IWAGPR.2015.7292654","DOIUrl":"https://doi.org/10.1109/IWAGPR.2015.7292654","url":null,"abstract":"This paper presents a prototype of a 3D imaging radar system at 10-20GHz for the non-destructive inspection of wooden house walls. We called the radar system as a multi-path linear array radar (MPLAR) system. The prototype of MPLAR system is consisted mainly of a data processing unit and a radar unit. The data processing unit is composed of a laptop PC, an A/D converter and a battery. The radar unit is composed of one-dimensional array antenna (32 transmitting and 32 receiving antennas which are resistively loaded printed bowtie antennas), two high speed RF switch units (SP32T × 2), a broadband step frequency radar unit (10-20GHz), a digital switching control unit and a radar control unit. The system acquires the frequency domain data for all the transmitting and receiving antenna pairs, i.e. 32 × 32 = 1024 pairs, in 33 milliseconds at a position. The number of frequency step is 64. So the step frequency is (20GHz-10GHz) / 64 = 156.25MHz. In two experiments, we indicated that the prototype of MPLAR system can output the 3D image of a wooden brace behind a decorated gypsum board of a Japanese wooden house wall by using synthetic aperture radar (SAR) technique. The SAR processing time, the measurement speed and the weight of the radar unit resulted in 3.6sec at 512mm measurement, 6cm/sec and 8kg respectively.","PeriodicalId":167391,"journal":{"name":"2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR)","volume":"50 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131744173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

GPR measurement campaign in the hill town of San Gimignano (Italy) 山城圣吉米尼亚诺的探地雷达测量活动(意大利)

2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR) Pub Date : 2015-07-07 DOI: 10.1109/IWAGPR.2015.7292662

M. Pieraccini, F. Parrini, F. Papi, F. Soldovieri, I. Catapano

引用次数: 1

Crosshole GPR full-waveform inversion and waveguide amplitude analysis: Recent developments and new challenges 井间探地雷达全波形反演与波导振幅分析:最新进展与新挑战

2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR) Pub Date : 2015-07-07 DOI: 10.1109/IWAGPR.2015.7292647

A. Klotzsche, J. van der Kruk, A. Mozaffari, N. Gueting, H. Vereecken

{"title":"Crosshole GPR full-waveform inversion and waveguide amplitude analysis: Recent developments and new challenges","authors":"A. Klotzsche, J. van der Kruk, A. Mozaffari, N. Gueting, H. Vereecken","doi":"10.1109/IWAGPR.2015.7292647","DOIUrl":"https://doi.org/10.1109/IWAGPR.2015.7292647","url":null,"abstract":"Over the last years, crosshole GPR full-waveform inversion has proved to be a powerful tool to map and characterize aquifers with a decimeter-scale resolution. Especially the detection of small-scale high contrast layers that can be related to zones of high porosity and zones of preferential flow improved our understanding of the propagation of the electromagnetic waves related to these features. Here, we give an overview of the potential and challenges of applying the full-waveform inversion to experimental data and discuss the obtained results for crosshole GPR data acquired at different test sites. Thereby, we also demonstrate the theoretical developments and illustrate the necessary steps that are required to achieve reliable full-waveform inversion results, which are not only indicated by a good fit of the measured and modelled traces, but also by the absence of a remaining gradient for the final models. One requirement and important step is to obtain good starting models. Whereas ray-based approaches sometimes cannot provide sufficient good starting models, the waveguide amplitude analysis can help to improve these starting models.","PeriodicalId":167391,"journal":{"name":"2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124604942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Spectral enhancement of GPR data: Some practical considerations 探地雷达数据的频谱增强:一些实际考虑

2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR) Pub Date : 2015-07-07 DOI: 10.1109/IWAGPR.2015.7292692

J. Tronicke, S. Schennen, N. Allroggen

引用次数: 2

Fracture thickness from GPR measurements GPR测量的裂缝厚度

2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR) Pub Date : 2015-07-07 DOI: 10.1109/IWAGPR.2015.7292656

D. Arosio, L. Zanzi, L. Longoni, M. Papini

{"title":"Fracture thickness from GPR measurements","authors":"D. Arosio, L. Zanzi, L. Longoni, M. Papini","doi":"10.1109/IWAGPR.2015.7292656","DOIUrl":"https://doi.org/10.1109/IWAGPR.2015.7292656","url":null,"abstract":"Rock investigation is definitely not a recent application of Ground Penetrating Radar (GPR) technique, as first studies date back to the seventies. However, only in the last decade research activities have started to address GPR characterization of rock fracture parameters, namely aperture and filling material. Rock fractures can generally be considered as thin beds, i.e., two interfaces whose distance is smaller than radar range resolution. Most of the past studies analyzed thin-bed response in the time domain, addressing time resolution, the linear relationship between bed thickness and reflected amplitude, and the derivative effect upon the incident signal. Amplitude calibration might permit to estimate fracture features for arbitrarily thin beds, but it is difficult to achieve and could be applied only to favorable cases. In this paper we explore the possibility to estimate fracture thickness and filling in the frequency domain by means of GPR. After reviewing the theoretical aspects of thin-bed response, we processed GPR data collected on ornamental marble blocks, where fractures of known aperture were simulated. We also performed numerical modelling tests to support the analysis of real datasets. Our approach consists of a 4-step procedure in which deterministic deconvolution is used to retrieve magnitude and phase thin-bed response in the selected frequency band. The procedure provided satisfactory outcomes when applied to real as well as to modelled thin-bed reflections. Results are encouraging and suggest that, under favorable circumstances, GPR could be a fast and effective tool to determine fracture parameters in non-destructive manner. Further testing is needed in order to fine-tune the processing sequence and to extend the validity of our preliminary findings to more complex case studies.","PeriodicalId":167391,"journal":{"name":"2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123790682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Investigation of near field beam patterns for rotating arrays 旋转阵列近场波束方向图研究

2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR) Pub Date : 2015-07-07 DOI: 10.1109/IWAGPR.2015.7292674

H. Cetinkaya, J. Wang, A. Yarovoy

引用次数: 1

Optical method for the positioning of measurement points 测量点定位的光学方法

2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR) Pub Date : 2015-07-07 DOI: 10.1109/IWAGPR.2015.7317463

P. Falorni, L. Capineri

引用次数: 4

Numerical modelling and neural networks for landmine detection using ground penetrating radar 利用探地雷达探测地雷的数值模拟和神经网络

2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR) Pub Date : 2015-07-07 DOI: 10.1109/IWAGPR.2015.7292682

I. Giannakis, A. Giannopoulos, C. Warren, N. Davidson

{"title":"Numerical modelling and neural networks for landmine detection using ground penetrating radar","authors":"I. Giannakis, A. Giannopoulos, C. Warren, N. Davidson","doi":"10.1109/IWAGPR.2015.7292682","DOIUrl":"https://doi.org/10.1109/IWAGPR.2015.7292682","url":null,"abstract":"A numerical modelling case study is presented aiming to investigate aspects of the applicability of artificial neural networks (ANN) to the problem of landmine detection using ground penetrating radar (GPR). An essential requirement of ANN and machine learning in general, is an extensive training set. A good training set should include data from as many scenarios as possible. Therefore, a training set consisting of simulated data from a diverse range of models with varying: topography, soil inhomogeneity, landmines, false alarm targets, height of the antenna, depth of the landmines, has been produced and used. Previous approaches, have employed limited training sets and as a result they often have underestimated the capabilities of ANN. In this preliminary study, a 2D Finite-Difference Time-Domain (FDTD) model has been used as the training platform for ANN. Although a 2D approach is clearly a simplification that cannot directly translate to a practical application, it is a computationally efficient approach to examine the performance of ANN subject to an extensive training set. The results are promising and provide a good basis to further expand this approach in the future by employing even more realistic, but computationally expensive, 3D models and well-characterised, real data sets.","PeriodicalId":167391,"journal":{"name":"2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132554817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Determination of velocities with radar in road layers 用雷达测定道路层中的速度

2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR) Pub Date : 2015-07-07 DOI: 10.1109/IWAGPR.2015.7292653

C. Grégoire, A. Van der Wielen, C. Van Geem

{"title":"Determination of velocities with radar in road layers","authors":"C. Grégoire, A. Van der Wielen, C. Van Geem","doi":"10.1109/IWAGPR.2015.7292653","DOIUrl":"https://doi.org/10.1109/IWAGPR.2015.7292653","url":null,"abstract":"In order to calibrate the radar equipment and to perform measurements in well controlled conditions, a test site was constructed in the hall of BRRC. On this test site, 4 different road configurations are built (asphalt layer on concrete plates, asphalt layer on lean concrete, concrete layer on lean concrete separated by a thin layer asphalt and asphalt covering cobblestone). An unbound aggregate layer serves as a base layer. Pipes and cables were buried in the structure and other defaults. The site is instrumented with temperature and strain gauges. During the construction, geotechnical measurements and control of density were performed. Radar measurements were performed on the test site with the BRRC radar equipment (2 GHZ GSSI horn antenna, 1 GHz GSSI horn antenna and 400 MHz GSSI contact antenna). Three different approaches were used to estimate the velocity of radar waves in the first road layer. The first approach consists in calculating the velocity using the real layer thickness and the measured two-way times. The second approach consists in using the GSSI software calculating automatically the velocities. The third approach is based on the analysis of the reflection on the surface, which is compared to a calibration signal. This paper presents the three approaches.","PeriodicalId":167391,"journal":{"name":"2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128629557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Quasi TEM-Horn antenna array for rescue radar buried victims under rubble 用于救援雷达的准tem -喇叭天线阵被埋在废墟下

2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR) Pub Date : 2015-07-07 DOI: 10.1109/IWAGPR.2015.7292686

A. K. Keskin, M. Senturk, A. S. Turk, T. O. Topbas

{"title":"Quasi TEM-Horn antenna array for rescue radar buried victims under rubble","authors":"A. K. Keskin, M. Senturk, A. S. Turk, T. O. Topbas","doi":"10.1109/IWAGPR.2015.7292686","DOIUrl":"https://doi.org/10.1109/IWAGPR.2015.7292686","url":null,"abstract":"In this paper, it is presented that quasi TEM-Horn antenna array to rescue buried victims under rubble. Designed antenna array, which consists of 4 elements, is operated between 400 MHz and 2 GHz. In order to penetrate electromagnetic wave into rubble, lower frequencies like 400-500 MHz should be used, because of attenuation of the concrete. Besides, it is required that ultra-wide band operation for good resolution while searching a buried victim. As an element of the array, quasi TEM-Horn antenna is utilized. Total dimensions of the array antenna are 14 cm × 27 cm × 57 cm. Distance between each element is 14 cm and also there is a reflector behind the antennas. Antenna gain is started from 8 dBi at 400 MHz and is increased till 14 dBi at 2 GHz. Furthermore, VSWR of the antenna is mostly fewer than 2 at the operation band, but at some frequencies it reaches 3. Reflector, which is placed 6 cm behind the array, is not only providing gain enhancement, but also reducing back lobe radiation at lower frequencies and shielding. Moreover array elements could be employed to understand which way the target is using A-scan data.","PeriodicalId":167391,"journal":{"name":"2015 8th International Workshop on Advanced Ground Penetrating Radar (IWAGPR)","volume":"59 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120869040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2