2016 16th International Conference on Ground Penetrating Radar (GPR)最新文献_第3页

A multiband-pass filtering method to suppress sleeper noise in railway subgrade vehicle-mounted GPR data 铁道路基车载探地雷达数据中轨枕噪声的多带通滤波方法

2016 16th International Conference on Ground Penetrating Radar (GPR) Pub Date : 2016-06-13 DOI: 10.1109/ICGPR.2016.7572683

J. Xiao, Y. Q. Wang, L. Liu

{"title":"A multiband-pass filtering method to suppress sleeper noise in railway subgrade vehicle-mounted GPR data","authors":"J. Xiao, Y. Q. Wang, L. Liu","doi":"10.1109/ICGPR.2016.7572683","DOIUrl":"https://doi.org/10.1109/ICGPR.2016.7572683","url":null,"abstract":"Vehicle-mounted ground penetrating radar (GPR) is an effective and rapid tool to detect railway subgrade defects. However, the signal to noise ratio (SNR) of the raw GPR data on railway subgrade is much lower than that of other detection sites. The primary noises are caused by radar wave reflections from the rails and steel-concrete sleepers. However, the rail noise is always invariant since the rails are longitudinal relative to the GPR scanning direction. On the contrary, the sleeper noise is regularly variable since the sleepers are transverse to the GPR scanning position. Therefore, it is essential to suppress the sleeper noise. First, we simulate the GPR signal based on the railway subgrade model and get the synthetic GPR data. There are many “honeycomb” banded distributions in the synthetic GPR image. It is the reflection signal from the sleepers. According to the spectral characteristics of the synthetic GPR data, the sleeper noise is easy to be identified. Next, we design a multiband-pass filter (MPF) to process the synthetic GPR data, and the sleeper noise dramatically weakens. Finally, the real GPR data are filtered by the multiband filter; the “honeycomb” band strips are substantially suppressed. With further image processing the subgrade defects can be more accurately identified.","PeriodicalId":187048,"journal":{"name":"2016 16th International Conference on Ground Penetrating Radar (GPR)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126504162","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

Studying of influence of temperature of rocks with varying humidity on GPR data 不同湿度下岩石温度对探地雷达数据的影响研究

2016 16th International Conference on Ground Penetrating Radar (GPR) Pub Date : 2016-06-13 DOI: 10.1109/ICGPR.2016.7572637

L. Fedorova, K. Sokolov, D. Savvin, A. P. Ammosov

引用次数: 0

Random noise de-noising and direct wave eliminating in ground penetrating radar signal using SVD method 利用奇异值分解方法对探地雷达信号进行随机噪声去噪和直接波去噪

2016 16th International Conference on Ground Penetrating Radar (GPR) Pub Date : 2016-06-13 DOI: 10.1109/ICGPR.2016.7572636

C. Song, Q. Lu, Cai Liu, Y. Gao

引用次数: 9

Correction of GPR wave velocity with distorted hyperbolic reflection in underground utility's GPR survey 地下公用事业探地雷达测量中畸变双曲反射的探地雷达波速校正

2016 16th International Conference on Ground Penetrating Radar (GPR) Pub Date : 2016-06-13 DOI: 10.1109/ICGPR.2016.7572629

W. Lai, J. Sham, F. Xie

引用次数: 1

Design of RF tags attaching to buried pipes for enhanced detection by GPR 埋管射频标签设计，增强探地雷达探测能力

2016 16th International Conference on Ground Penetrating Radar (GPR) Pub Date : 2016-06-13 DOI: 10.1109/ICGPR.2016.7572622

W. Y. Zhang, Y. Chang, T. Hao

{"title":"Design of RF tags attaching to buried pipes for enhanced detection by GPR","authors":"W. Y. Zhang, Y. Chang, T. Hao","doi":"10.1109/ICGPR.2016.7572622","DOIUrl":"https://doi.org/10.1109/ICGPR.2016.7572622","url":null,"abstract":"Ground Penetrating Radar (GPR) is a well-received non-destructive technique for the detection of underground utilities, such as water/gas pipes, sewers, power cables, and telecommunication ducts. However, radar signatures of non-metallic pipes are generally weak in certain conditions, for instance when the surrounding soils are attenuative and/or the pipe-soils interface is non-distinguishable from the electromagnetic standpoint. In order to increase the radar visibility of these pipes, attaching Radio-Frequency (RF) tags to them is a useful method. This paper will discuss Bowtie-Omega shaped RF tags. Finite Element Method is used in our modeling, where the electromagnetic characteristics of each tag candidate are computed. Then the tags are buried in a 4.5 m × 3.5 m × 1.5 m tank partly filled with dry sand. A pulsed GPR system is used to conduct B-scans on one side of the tank, and stronger radar signatures are observed when RF tags are buried. Furthermore, the corresponding enhanced frequency domain response of each trace is clearly seen at the designed resonant frequencies, which are not there when tags are not inserted. The resulting enhanced detection due to the existence of the tags is evident.","PeriodicalId":187048,"journal":{"name":"2016 16th International Conference on Ground Penetrating Radar (GPR)","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114882267","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

Electromagnetic environment comprehension for radar detection of vital signs at China National Training Center for earthquake search & rescue 中国地震搜救训练中心雷达探测生命体征的电磁环境综合

2016 16th International Conference on Ground Penetrating Radar (GPR) Pub Date : 2016-06-13 DOI: 10.1109/ICGPR.2016.7572667

L. Liu, M. Liu, J. Q. Wang

{"title":"Electromagnetic environment comprehension for radar detection of vital signs at China National Training Center for earthquake search & rescue","authors":"L. Liu, M. Liu, J. Q. Wang","doi":"10.1109/ICGPR.2016.7572667","DOIUrl":"https://doi.org/10.1109/ICGPR.2016.7572667","url":null,"abstract":"Previous studies have demonstrated that the radar technique is one of the most effective ways to detect human vital signs in certain circumstances. However, the problem of the complex electromagnetic environment at an earthquake disaster site has not been fully explored in the literature to date. To characterize and comprehend the electromagnetic environment in radio frequencies in a typical field site for the task of search and rescue by using radar technology to search for human vital signs originated from buried living victims we conducted a field test to collect data by using the 400-MHz ground penetrating radar on a one-to-one scale collapsed building model at China National Training Center for Earthquake Search & Rescue (CNTCESR) operated by China Earthquake Administration (CEA) in Beijing. The physical model is a collapsed 3-storey reinforced concrete building. Both constant-offset and multi-offset reflection profiles are collected on the relatively intact roof of the building with a size of 17 × 12 m. The constant offset (monostatic) reflection profiles are collected at 10-cm spacing in-line and 20-cm spacing off-line to cover a 15 × 10 m area. Multi-offset profiles are collected at a few given locations. The time window for all radar profiles is 100 nanoseconds. We used the digital point-cloud technique to construct the 3D digital model of the collapsed building. This 3D model is the basis for conducting radar wave propagation forward modeling and inversion imaging. The awareness and comprehension of the ambient electromagnetic condition will be incorporated in the algorithm for radar detection of human vital signs for earthquake victim search and rescue in real world field practice.","PeriodicalId":187048,"journal":{"name":"2016 16th International Conference on Ground Penetrating Radar (GPR)","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117095865","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

Noise suppressing and direct wave removal in GPR data based on shearlet transform 基于剪切波变换的探地雷达数据噪声抑制与直接去波

2016 16th International Conference on Ground Penetrating Radar (GPR) Pub Date : 2016-06-13 DOI: 10.1109/ICGPR.2016.7572615

X. Wang, S. Liu

引用次数: 2

High resolution MW holographic system for NDT of dielectric materials and details 用于介质材料及细部无损检测的高分辨率毫瓦全息系统

2016 16th International Conference on Ground Penetrating Radar (GPR) Pub Date : 2016-06-13 DOI: 10.1109/ICGPR.2016.7572595

S. Ivashov, A. Zhuravlev, M. Chizh, V. Razevig

{"title":"High resolution MW holographic system for NDT of dielectric materials and details","authors":"S. Ivashov, A. Zhuravlev, M. Chizh, V. Razevig","doi":"10.1109/ICGPR.2016.7572595","DOIUrl":"https://doi.org/10.1109/ICGPR.2016.7572595","url":null,"abstract":"In recent years, there has been a surge of new applications of composite materials and structures in aerospace industry. The composites have many advantages over traditional metal alloys. They have, as a rule, better strength/weight ratio, withstand to unfavorable weather conditions and aggressive environments. Corrosion also doesn't affect them. Traditional methods of ultrasonic diagnostics are ineffective for porous composites such as polyurethane foam insulation, silicate fiber tiles as well as for honeycomb construction details due to high levels of acoustic wave attenuation in them. In some cases, microwave holographic subsurface radars can be a reasonable alternative to ultrasonic testing. A specially designed test setup, which uses a vector network analyzer for generating and receiving signals, was created. Operational frequency band of the test setup gives opportunity to carry out experiments in a broad range of 10MHz-24 GHz. The setup records complex multi-frequency holograms, for the reconstruction of which the software was developed. A sample of polyurethane foam insulation, which is used for shielding of rocket cryogenic fuel tanks, was tested in the setup. The sample had preliminary produced defects. Comparison of the samples testing results and the defects maps showed that they are in a good coincidence.","PeriodicalId":187048,"journal":{"name":"2016 16th International Conference on Ground Penetrating Radar (GPR)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122119124","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: 9

Efficient back projection imaging approach for airborne GPR using NUFFT technique 基于NUFFT技术的机载探地雷达高效反投影成像方法

2016 16th International Conference on Ground Penetrating Radar (GPR) Pub Date : 2016-06-13 DOI: 10.1109/ICGPR.2016.7572626

L. Qu, Y. Yin, Y. Sun, L. Zhang

引用次数: 2

Experiments with a dipole array and loop antenna in a cylindrical water layer 偶极子阵列和环形天线在圆柱形水层中的实验

2016 16th International Conference on Ground Penetrating Radar (GPR) Pub Date : 2016-06-13 DOI: 10.1109/ICGPR.2016.7572659

S. Ebihara, Y. Shimomura, K. Hotta, K. Hosokawa, G. Hoshii

{"title":"Experiments with a dipole array and loop antenna in a cylindrical water layer","authors":"S. Ebihara, Y. Shimomura, K. Hotta, K. Hosokawa, G. Hoshii","doi":"10.1109/ICGPR.2016.7572659","DOIUrl":"https://doi.org/10.1109/ICGPR.2016.7572659","url":null,"abstract":"This paper describes subsurface measurements using a singlehole directional borehole radar system that revealed the presence of a kind of guided wave propagating along the borehole. The radar system used dipole arrays for both the transmitter and receiver. In this case, all the antenna elements were located off the center axis of the borehole. Computer simulations confirmed that the off-center dipole would excite the HE11 mode above about 200 MHz. The characteristics of the mode are that there is much phase difference among the array signals, and waveforms in the time domain are shaped like a damped oscillatory wave. To test these predictions, a borehole radar system was designed and built with a dipole array and a loop antenna for both the transmitter and receiver; the system was used for field experiments in soil. We observed the HE11 mode waves at frequencies above 200 MHz, as predicted in the simulation. When the center frequency was 100 MHz, there was no damped oscillatory wave in the time domain in the experimental data, and we confirmed that there was no guided wave, as expected from the computer simulation.","PeriodicalId":187048,"journal":{"name":"2016 16th International Conference on Ground Penetrating Radar (GPR)","volume":"170 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126285180","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