现代数字信号处理技术在位场数据处理中的研究及应用
发布时间：2018-10-20 15:28
【摘要】：位场是由地下密度不均匀或磁性不均匀地质体引起的叠加场,是一种体积效应,具有一定的复杂性,使得异常分离显得尤为重要。异常分离技术则是分异的基本手段。本论文在傅氏变换的基础上,首先对以维纳滤波原理的维纳滤波器和匹配滤波器,以及根据平面等值线图上异常的规模和强度来构制的宽度幅值特征滤波器进行了研究。利用三种滤波技术分别对三球模型和五方体模型进行了滤波处理,得出了不同算法下的分离场。然后利用匹配滤波和宽度幅值特征滤波对西藏某工区的实际重磁资料进行了处理,得出的局部场和区域场较好的反映了浅部和深部的地质情况。利用匹配滤波技术对四川某工区的实际重力资料进行了分析,得出的局部场较好的反映了浅部的地质体大致范围。利用双谱的特性检测到在高噪声中的有用信号。利用时-频分析技术来分析和判断由地质体产生的频率随距离的变换关系。分别处理和分析了多方体、多球体和多板体模型在距离-频率曲线上的变化关系和特征。利用不同地质体在剖面上的不同距-频特征来判断识别不同组合模型的形态、边界和大小。然后对四川某工区的两条剖面进行了距-频分析,初步划定了地质体的边界和形态。
[Abstract]:The potential field is a superposition field caused by the underground density inhomogeneity or magnetic heterogeneity. It is a volume effect and has some complexity, which makes the abnormal separation more important. Anomaly separation technology is the basic means of differentiation. On the basis of Fourier transform, this paper first studies Wiener filter and matched filter based on Wiener filter principle, and the width amplitude characteristic filter constructed according to the abnormal scale and intensity of plane isoline map. Three kinds of filtering techniques are used to filter the three-sphere model and the pentagonal model, and the separation fields under different algorithms are obtained. Then the actual gravity and magnetic data of a certain working area in Tibet are processed by using matched filtering and width amplitude characteristic filtering. The local and regional fields can well reflect the geological conditions in shallow and deep areas. The actual gravity data of a certain working area in Sichuan Province are analyzed by using the matched filtering technique, and the local field can well reflect the general range of the shallow geological body. Bispectral characteristics are used to detect useful signals in high noise. The time-frequency analysis technique is used to analyze and judge the relationship between frequency and distance generated by geological bodies. The relationship and characteristics of multi-body, multi-sphere and multi-plate models on the distance-frequency curve are analyzed and processed respectively. The shape, boundary and size of different combination models are identified by using the different distance and frequency characteristics of different geological bodies in the profile. Then, the distance frequency analysis of two sections in a working area of Sichuan Province is carried out, and the boundary and shape of geological body are preliminarily delineated.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631
本文编号：2283575
[Abstract]:The potential field is a superposition field caused by the underground density inhomogeneity or magnetic heterogeneity. It is a volume effect and has some complexity, which makes the abnormal separation more important. Anomaly separation technology is the basic means of differentiation. On the basis of Fourier transform, this paper first studies Wiener filter and matched filter based on Wiener filter principle, and the width amplitude characteristic filter constructed according to the abnormal scale and intensity of plane isoline map. Three kinds of filtering techniques are used to filter the three-sphere model and the pentagonal model, and the separation fields under different algorithms are obtained. Then the actual gravity and magnetic data of a certain working area in Tibet are processed by using matched filtering and width amplitude characteristic filtering. The local and regional fields can well reflect the geological conditions in shallow and deep areas. The actual gravity data of a certain working area in Sichuan Province are analyzed by using the matched filtering technique, and the local field can well reflect the general range of the shallow geological body. Bispectral characteristics are used to detect useful signals in high noise. The time-frequency analysis technique is used to analyze and judge the relationship between frequency and distance generated by geological bodies. The relationship and characteristics of multi-body, multi-sphere and multi-plate models on the distance-frequency curve are analyzed and processed respectively. The shape, boundary and size of different combination models are identified by using the different distance and frequency characteristics of different geological bodies in the profile. Then, the distance frequency analysis of two sections in a working area of Sichuan Province is carried out, and the boundary and shape of geological body are preliminarily delineated.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631
【引证文献】
相关会议论文 前2条
1 石殿祥;陈树凯;郑天才;任义庆;;用高阶统计量估算非最小相位地震子波[A];1998年中国地球物理学会第十四届学术年会论文集[C];1998年
2 王家映;;高阶统计量在大地电磁资料处理中的应用研究[A];2001年中国地球物理学会年刊——中国地球物理学会第十七届年会论文集[C];2001年
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