搜索结果: 1-15 共查到“GPR”相关记录20条 . 查询时间(0.136 秒)
基于归一化互相关成像条件的GPR逆时偏移成像
探地雷达 逆时偏移 归一化互相关成像条件 零时刻成像条件
2019/3/7
针对基于零时刻成像条件的探地雷达(GPR)逆时偏移精度低、难以对复杂结构进行高精度成像的缺点，将归一化互相关成像条件应用于GPR叠前逆时偏移成像。从二维GPR电磁波方程出发，采用基于完全匹配层(PML)边界条件的时域有限单元法(FETD)模拟电磁波正向和逆向传播，采用归一化互相关成像条件获取叠前逆时偏移的偏移结果，将空间高通滤波用于压制互相关过程中产生的低频噪声，然后编制相应的GPR叠前逆时偏移程...
ASSESSING THE CONDITION OF BURIED PIPE USING GROUND PENETRATING RADAR (GPR)
Ground Penetrating Radar (GPR) Pipe deterioration Buried utilities
2018/11/8
The invention of Ground Penetrating Radar (GPR) technology has facilitated the possibility of detecting buried utilities and has been used primarily in civil engineering for detecting structural defec...
An experiment on a sand-dune environment in Southern Venetian coast based on GPR, VES and documentary evidence
GPR-coastal dunes groundwater salt-water intrusion littoral evolution
2015/9/28
The internal structures of some surviving sand dunes and the ancient shore-lines along the coast south of Venice have been investigated integrating Ground Probing Radar (GPR) profiles, Vertical Electr...
Digital photogrammetry, GPR and finite elements in heritage documentation: geometry and structural damages
Close Range Digital Photogrammetry GPR Structural analysis Structural Damages Surveying Cultural Heritage
2015/8/24
This paper shows a multidisciplinary approach to heritage documentation involving Close Range Photogrammetry and Ground Penetrating Radar techniques, as well as the development of finite elements base...
基于GPR模型的自适应平方根容积卡尔曼滤波算法
非线性滤波 平方根容积卡尔曼滤波 高斯过程回归 状态估计 状态转移模型 量测模型 模型增强
2013/11/12
与传统算法一样,动态系统的参数化模型(含噪声统计特性)未知或不够准确易导致容积卡尔曼滤波(CKF)效果严重下降,甚至滤波结果发散。为此,利用高斯过程回归(GPR)方法对训练数据进行学习,得到动态系统的状态转移GPR模型和量测GPR模型以及噪声统计特性,用以替代或增强原有动态系统模型,并将其融入到平方根容积卡尔曼滤波(SRCKF)中,分别提出了无模型高斯过程SRCKF(MFGP-SRCKF)和模型增...
Interpretation of Dune Genesis from Sedimentogical Data and Ground Penetrating Radar (GPR) Signatures: A Case Study from Ashirmata Dune Field, Mandvi Beach, Gujarat, India
Coastal Dune Ashirmata Region Sedimentogical Analysis
2013/3/11
The coastal dunes located near the Ashirmata region, south of Mandvi beach lies near the straight coast have been stud-ied by making use of sedimentological information and Ground Penetrating Radar (G...
从Maxwell方程组出发,推导了探地雷达(GPR)有限元波动方程.阐述了透射边界条件和Sarma边界条件的原理,推导了这两种边界条件的理论公式;通过在衰减层内加入过渡带优化了Sarma边界条件的加载方法,压制了介质区和衰减层交界面处的人为反射.考虑到透射边界条件与Sarma边界条件不同的理论机制,提出了一种结合透射边界条件和Sarma边界条件的混合边界条件,它利用Sarma边界条件对到达边界区域...
基于GPR的机场跑道中钢筋回波检测与抑制
Hyp-curvelet变换 双曲线Radon变换 钢筋回波抑制 目标检测
2013/8/18
钢筋强反射回波及其多次波严重影响探地雷达在机场跑道灾害目标检测与识别的应用。本文研究机场跑道钢筋回波检测及抑制的方法。首先利用Hyp-curvelet变换将GPR时空二维回波信号投影到尺度空间，目标回波的能量将聚集且与其他目标分离，进而基于尺度空间中的局部峰值进行目标检测。然后结合目标回波的初始相位及时频特征，在尺度空间中消除钢筋回波分量。最后将数据反变换回时空域，得到只含有灾害目标回波的数据。仿...
基于压缩感知的GPR成像算法
压缩感知 Nyquist采样定理 反向投影算法
2013/5/24
传统的探地雷达(ground penetrating radar, GPR)数据采集需要满足Nyquist采样定理,严重影响了GPR成像效率。基于压缩感知理论,稀疏信号可以在远低于Nyquist采样率的情况下通过求解l1范数约束下的凸最优化问题得到精确恢复,克服了传统算法中数据采集的局限。将压缩感知理论应用于GPR成像,利用仿真数据系统分析了测量矩阵维度、信噪比、数据损失程度和目标密集度等因素对成...
交替方向隐式差分(ADI-FDTD)法突破了Courand-Friedrich-Levy(CFL)条件的约束,具有无条件稳定的特点;而单轴各向异性完全匹配层(UPML)边界条件具有宽频带吸收特性,不需要对电场和磁场进行分裂,迭代公式简单,便于编程的特点.综合两者优势,本文提出了基于UPML边界条件的ADI-FDTD探地雷达数值模拟算法,通过对3个二维Maxwell方程进行离散化,推导了GPR波的A...
基于压缩感知的GPR成像算法
探地雷达成像 压缩感知 Nyquist采样定理 反向投影算法
2013/8/19
传统的探地雷达(ground penetrating radar, GPR)数据采集需要满足Nyquist采样定理,严重影响了GPR成像效率。基于压缩感知理论,稀疏信号可以在远低于Nyquist采样率的情况下通过求解l1范数约束下的凸最优化问题得到精确恢复,克服了传统算法中数据采集的局限。将压缩感知理论应用于GPR成像,利用仿真数据系统分析了测量矩阵维度、信噪比、数据损失程度和目标密集度等因素对成...
Building damage caused by tree roots: laboratory experiments of GPR and ERT surveys
Building damage caused by tree roots laboratory experiments GPR ERT surveys
2010/9/13
The root growth of trees close to buildings can cause directly or indirectly structural damages and the necessity arises of diagnostic tools to follow their time-spatial behaviour. In this framework, ...
Mapping soil fractal dimension in agricultural fields with GPR
soil fractal dimension agricultural fields GPR
2009/11/2
We documented that the mapping of the fractal dimension of the backscattered Ground Penetrating Radar traces (Fractal Dimension Mapping, FDM) accomplished over heterogeneous agricultural fields gives ...
Integrating GPR and CCRI techniques：Implications for the identification and mapping of ground ice on Mars
ground ice identification and mapping Mars
2009/6/1
Our results show that GPR and CCRI techniques effectively complement each other by resolving different characteristics of the subsurface. While GPR clearly showed the subsurface structures and interfa...
Evaluation of soil and ground water contamination by GPR
GPR ground water contamination soil contamination
2009/3/5
Detection and evaluation of contaminated soil and ground water by GPR method was discussed. The electric properties of soil and contaminant and their mixed material are significant for GPR. Some model...