三分量地震检波器的转换公式及误差分析     

师先进  何仁汉 《上海国土资源》1992,(3):35-40

54.74°型三分量检波器在某种环境下按置常发生偏差,本文研究在偏差情况下的信号转换公式及误差分析。  相似文献   

3D高阶抛物Radon变换在不规则地震数据保幅重建中的应用          下载免费PDF全文

唐欢欢  毛伟建  詹毅 《地球物理学报》1954,63(9):3452-3464

3D地震数据不规则采样缺失重建是地震勘探数据处理流程中的重要问题.本文提出了一种基于具有保幅特性的非均匀高阶抛物Radon变换（NHOPRT）地震数据重建方法.在最小二乘反演方程中引入Delaunay三角网格剖分来计算空间不规则加权系数,从而获得最接近完整规则数据的高阶抛物Radon变换域系数.在用SVD求解反演方程过程中,利用高阶抛物Radon变换算子在频率域为指数函数,具有线性可分解特性,将二维空间的高阶抛物Radon变换算子分解为两个独立的一维空间变换算子,减小了变换算子的矩阵大小,从而很大程度地提高了计算效率.理论模型和实际地震数据重建测试证明了本文方法的有效性以及实用性.  相似文献   

Admittance signatures of rifted and transform margins: examples from eastern Canada   总被引：1，自引：0，他引：1  

J. Verhoef  H. R. Jackson 《Geophysical Journal International》1991,105(1):229-239

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Investigation of Image Fusion Between High—Resolution Image and Multi—Spectral Image     

LlPingxiang WANGZhijun 《地球空间信息科学学报》2003,6(2):31-34

On the basis of a thorough understanding of the physical characteristics of remote sensing image,this paper employs the theories of wavelet transform and signal sampling to develop a new image fusion algorithm.The algorithm has been successfully applied to the image fusion of SPOT PAN and TM of Guangdong province, China The experimental results show that a perfect image fusion can be built up by using the image analytical solution and reconstruction in the image frequency domain based on the physical characteristics of the image formation.The method has demonstrated that the results of the image fusion do not change spectral characteristics of the original image.  相似文献   

小波变换在探地雷达探测地下管线信号处理中的应用   总被引：10，自引：7，他引：3  

吴畏  郭华  张井  梅发国  简小刚 《地球物理学进展》2003,18(3):493-496

阐述了小波变换的基本理论,给出了小波变换在探地雷达方面的应用实例．认为小波变换时频局域性好,是分析非平稳信号的有效工具之一。实例分析表明,小波方法在城市地下管线探测信号去除噪音分析处理方面具有优异性能。能有效提高探地雷达探测地下管线的精度。  相似文献   

A technique to improve the empirical mode decomposition in the Hilbert-Huang transform   总被引：2，自引：0，他引：2  

陈扬波  冯青 《地震工程与工程振动(英文版)》2003,2(1):75-85

The Hilbert-based time-frequency analysis has promising capacity to reveal the time-variant behaviors of a system. To admit well-behaved Hilbert transforms, component decomposition of signals must be performed beforehand. This was first systematically implemented by the empirical mode decomposition (EMD) in the Hilbert-Huang transform, which can provide a time-frequency representation of the signals. The EMD, however, has limitations in distinguishing different components in narrowband signals commonly found in free-decay vibration signals. In this study, a technique for decomposing components in narrowband signals based on waves’ beating phenomena is proposed to improve the EMD, in which the time scale structure of the signal is unveiled by the Hilbert transform as a result of wave beating, the order of component extraction is reversed from that in the EMD and the end effect is confined. The proposed technique is verified by performing the component decomposition of a simulated signal and a free decay signal actually measured in an instrumented bridge structure. In addition, the adaptability of the technique to time-variant dynamic systems is demonstrated with a simulated time-variant MDOF system.  相似文献   

遥感影像镶嵌时拼接缝的消除方法   总被引：29，自引：0，他引：29  

朱述龙  钱曾波 《遥感学报》2002,6(3):183-187

对现有的影像并接缝消除方法的优缺点进行了分析,提出了拼接缝消除的强制改正方法,并用大量的实际图像进行了试验。结果表明：所提出的方法具有较好的拼接缝消除效果,且算法简单,易于实现,可以处理彩色和黑白等多种图像。  相似文献   

Research on scale effect of histogram   总被引：2，自引：0，他引：2  

张颢  焦子锑  杨华  李小文  王锦地  苏理宏  阎广建  赵红蕊 《中国科学D辑(英文版)》2002,45(10):949-960

To describe the spatial relationship among the earth objects compactly, in this paper, we raised the concept of histo-variogram based on the analysis of the characteristics of other spatial analyzing methods such as variogram, information entropy. And we also raised a new spatial analysis method of histogram decomposition based on the definition of standing pixel and contour pixel. At the end of this paper, we demonstrated the characteristics of histo-variogram by two experiments, one for spatial analysis, the other for image fusion.  相似文献   

高光谱图像数据变换编码压缩方法   总被引：6，自引：1，他引：5  

王春胜  禹秉熙  戴逸松  文大化 《遥感学报》2000,4(2):95-99

三维ＤＣＴ变换编码包括谱段方向的一维ＤＣＴ变换和由此产生的特征值图像的二维ＤＣＴ变换编码。谱段方向一维ＤＣＴ变换的主要作用是去除光谱方向的数据相关性,并产生由ＤＣＴ系数构成的并与各个谱段相对应的特征值图像。特征值图像的压缩由ＪＰＥＧ算法完成,图像的压缩比由ＪＰＥＧ的量化因子ｑ控制。图像边缘特征对高光谱图像的应用具有非常重要的意义,在高光谱图像的压缩过程中要尽量保持图像的边缘特征。我们设计了具有图像  相似文献   

基于小波变换模极大值的滑坡监测数据处理方法及其实现     

倪秀静  郭科  许强 《物探化探计算技术》2006,28(2):153-156

首先给出小波变换模极大值法用于滑坡体位移监测曲线去噪的处理方法,并对该方法在MATLAB中的实现进行了研究和探讨,给出了实现的算法步骤以及相应的MATLAB程序代码。利用实际数据资料,在MATLAB下进行滑坡体位移监测曲线去噪试验,取得了较理想的效果。实验结果表明,将小波变换模极大值法用于滑坡体数据处理,不但可以有效地消除噪声,而且还可以保持信号的阶跃或突变点的位置不变。  相似文献