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钢筋混凝土GPR检测图像的目标体快速识别技术 总被引：2，自引：0，他引：2
HUANG Ling ZENG Zhao-fa YAO Jian ZHANG Dai-guo College of GeoExploration Science Technology Jilin University Changchun China 《吉林大学学报(地球科学版)》2006,(Z2)
在一般的城建工程结构体的探地雷达检测中,为减小检测工作周期,需要进行现场探测、处理及解释;或是检测工区数据量大,逐个剖面进行人工处理解释需要很大的工作量和工作时间。为解决这些问题,引入了基于F—K偏移及小波变换法图像分割的目标体快速识别技术,对钢筋混凝土探地雷达检测图像进行处理,达到了对钢筋混凝土结构探地雷达检测图像快速处理与解释的效果,也为能够把数据处理程序直接嵌入探地雷达系统中提供理论基础。 相似文献
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混凝土雷达是用于建筑结构无损检测的一门新技术,理论上满足麦克斯韦方程和波动方程,具有分辨率高,可单面采集,测深大,数据处理简单,结果直观等特点.随着雷达技术水平的发展,混凝土雷达逐渐从探地雷达系统中独立出来,形成了专门用于混凝土结构检测的一套系统.结合CX系列混凝土雷达阐述了其理论和方法的可行性. 相似文献
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YAO Jian ZENG Zhao-fa HUANG Ling ZHANG Dai-guo College of GeoExploration Science Technology Jilin University Changchun China 《吉林大学学报(地球科学版)》2006,(Z2)
系统地介绍了基于矢量网络分析仪的步进频率探地雷达系统的基本原理及组成,同时采用该系统进行了野外勘探实验.通过对实验结果进行分析表明,低频探地雷达系统适合野外应用并具有准确的探测结果。 相似文献
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由于探地雷达系统大多采用超宽带窄脉冲信号,因此要求天线具有极宽的工作带宽。利用矩量法对线性离散电阻加载蝶形天线进行分析,结果表明,线性离散电阻加载在使天线获得宽带特性的同时,并使辐射的脉冲信号拖尾变得平稳,因此能够满足探地雷达系统的需要。 相似文献
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多输入多输出极化步进频率探地雷达硬件系统开发 总被引：1，自引：0，他引：1
对基于矢量网络分析仪的单发单收探地雷达系统进行扩展,组建了可实现信号多通道发射和多通道接收的步进频率探地雷达系统。该系统主要由计算机、矢量网络分析仪、三维直角坐标仪、开关控制转换器、同轴开关以及多次覆盖极化天线阵列构成。系统信号发射通道和信号接收通道均可扩展至6个通道,可满足一般天线阵列测量需求。多次覆盖天线阵列采集共中心点（CMP）数据,每个测点可获取2个共极化模式数据和4个交叉极化模式数据,数据叠加后噪声可得到有效压制,系统信噪比可获得较大提升;同时应用Pauli分解方法获得伪彩色剖面图以对目标物体进行散射机制的分类。对该多输入多输出步进频率探地雷达系统进行系统测试和实验的结果,验证了其可靠性。 相似文献
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阵列式观测是探地雷达系统研制和新型探测方法的一个重要发展趋势,而同形多源并发地下目标响应特征分析成为系统研制和数据处理研究的基础和前提。阵列式天线的多源并发信号及目标反射信号存在复杂的极化特性,但同时也包含更多目标特征的响应信息。本文针对基于似平面波探地雷达系统,分析了目标体在极化平面波照射下的响应特征,从多极化信号角度分析典型地下目标体形态特征;并采用时域有限差分正演分析方法,通过对阵列天线接收到的数据沿时间轴进行积分来获得目标在地表投影的分布情况,分析了一维及二维分布的收发天线阵列对目标的检测。研究成果表明,多极化综合特征分析能够有效改善目标检测的稳定性,提高目标响应信号的信噪比,减弱天线方向图和目标散射截面闪烁对数据剖面的影响,降低数据处理和解释的难度。 相似文献
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Monitoring of extreme events requires accurate measurement of rainfall intensities and merging weather radar data with ground information is a very common technique used to obtain the required precision. In order to do this, several methods exist but very few open source implementations are available. CondMerg is the first open source software developed in R language implementing the conditional merging method and some other experimental variants based on it. It is a cross-platform software, easily adaptable to different needs, optimized for batch processing of multiple events but also usable in near real time applications. For its execution it requires two inputs: a CSV file with rain gauges measurements and a geo-referred TIF file with weather radar quantitative precipitation estimations; main outputs are TIF files with merged observations although the code also returns information about cross-validation, with scatter plots and indexes. All TIF files are ready to be managed by common GIS software for easy visualization and analysis. Use of the program is very simple: execution can be interactive or non-interactive and, in both cases, it just requires to set some parameters at the beginning of the program and run it. The code has been tested on different extreme rain events occurred in the Piedmont region (northwestern Italy) showing improved accuracy of reconstructed rainfall fields. 相似文献
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An unexpected major storm on July 14, 2006, resulted in great loss to the Dongjiang reservoir basin in Zixing City, Hunan Province, China, during the dominance of Typhoon Bilis (2006). The rainfall characteristics and temporal evolution of this major storm were studied with rain gauge data and high-resolution radar reflectivity data to investigate the connections between typhoon, reservoir and convective storm. Our investigations found that the intense convective storm, which was characterized by a banded structure, brought heavy rainfall concentrated in the Dongjiang reservoir basin while the center of Typhoon Bilis was nearly 450 km away from the basin. By applying geographical information system techniques, analyses of radar reflectivity demonstrated that the topography of the Dongjiang reservoir has big influence on the development of convective storm. Furthermore, intense convective cells with strong radar reflectivity (>50 dBZ) arose more frequently over the edges of the reservoir, especially over the southern mountain valley in the basin. More importantly, our investigations indicate that the occurrence of this convective storm is closely related to a strong atmospheric inversion by examining the Atmospheric Infrared Sounder data. 相似文献
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综合物探方法在确定矿山采空区中的应用 总被引：6，自引：0，他引：6
矿山地区地表起伏大,利用传统的勘探方法确定地下采空区将耗费大量的人力和物力,采用综合物探方法、手段会起到事半功倍的效果。本文介绍了在鞍山矿区利用地质雷达法、瞬变电磁法、浅震反射波法、瞬态瑞雷波法来确定地下采空区。以便减少它们造成的地质灾害。 相似文献
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使用车载RTK施测带状图可大幅度提高工作效率。先把带状图中线按道路中线模式建入电子手簿,用中线导航使测点不偏离测图区域。车按"之"字形路线前进,车速控制在20km/h以。手簿切换到手动测量或定距自动记录状态,按40m一点密度采集地形数据。为使移动站能接收到基准站足够强度信号,距离控制在5km以内,基准站般站距离控制在10km以内。当移动站卫星信号间歇性失锁,或移动站与基准站之间电台讯号不稳时,所测得数据不可信。此方法只有便于载体运行的环境下才能发挥作用。 相似文献
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浅议如何创新地勘单位档案服务工作 总被引：1，自引：0，他引：1
本文根据工作实际,从思想观念、档案服务对象、服务内容、服务方式、服务手段、服务机制等方面阐述了创新对于档案工作的重要性,同时要求档案工作人员要增强现代化意识,实现档案人员的现代化,从而创新档案服务工作。 相似文献
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Bruce R. Barkstrom 《Earth Science Informatics》2011,4(1):45-53
This paper considers the problem of comparing the read time for a file containing an array of one-half million one-byte data
values using a direct read time with the time required to read an equivalent XML file. The XML file uses a variable-length
string encoding of the identifiers associated with each of the byte values. The XML file is about 180 times larger than the
original file of byte values. Because the XML file is much larger and because the XML parsing requires substantially more
computational work, reading the XML file on a Windows-based PC takes about 3,700 times longer than the direct read. The experimental
study shows that the XML read time increases linearly with the size of the file. Given the increased read time and the increased
probability of programming errors for the XML encoding, it appears that in cases where data archives are providing simple
binary or text files of data that may be readily understood and read with short programs, then XML may not be an optimal choice
for serving users or for preserving data. 相似文献
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详细讨论了STRATAGEM(EH4)音频大地电磁测量系统资料处理过程中所隐含的重要步骤及其实现过程,特别是由时间序列资料经FFT变换后所产生的原始谱叠加后的频点与其相应的X文件(互功率谱文件)中的频点对应、归属与筛选问题,由X文件形成Z(阻抗)文件时X文件中频点与Z文件中频点的对应、归属与筛选问题。上述问题的解决,为相关研究人员利用该设备所采集资料而开发其他阻抗估算技术提供了基础。 相似文献
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