地質(zhì)雷達（GPR）對于地下介質(zhì)的地球物理勘查來說是一種行之有效的技術(shù),特別是對于淺層地下來說。無損、高效和數(shù)據(jù)可靠是它作為淺地表地下調(diào)查一個理想工具的重要因素。根據(jù)地下目標的類型,應用中如何選擇地質(zhì)雷達天線的中心頻率和帶寬將是一件重要的事情。實際信號的頻率同分辨率、最大探測深度、地下探測物體的大小以及土壤介質(zhì)的性質(zhì)直接相關(guān)。因此對于每一次的勘探來說,都需要研究其天線頻率的局限性。當然,既要獲得高分辨的地下圖像（高頻）,也要有較大的探測深度（低頻）一直是技術(shù)改進的目標。為了從一個新的角度研究這個問題,本論文提出了一種應用不同發(fā)射-接收頻率的數(shù)據(jù)采集技術(shù)和利用頻帶寬度增強匹配濾波的數(shù)據(jù)處理技術(shù)。常規(guī)的采集方法中,發(fā)射-接收天線的中心頻率都是相同的,而在我們的試驗研究中這種情況發(fā)生了改變。為了取代通常的3對相同頻率天線對觀測,我們研究了50 MHz、100MHz和200MHz收-發(fā)天線不同組合的9種情況。試驗場地位于中國浙江杭州良渚的莫角山。通過對其接收數(shù)據(jù)的脈沖響應的研究,我們觀測到了頻率互換的不同效應。實際的觀測結(jié)果是:地質(zhì)雷達信號的頻帶寬度和勘探深度主要受到發(fā)射天線頻率的影響,而不是接... 

【文章來源】：浙江大學浙江省 211工程院校 985工程院校 教育部直屬院校

【文章頁數(shù)】：111 頁

【學位級別】：博士

【文章目錄】：
Acknowledgement
Abstract
摘要
Chapter 1 Introduction
    Overview
    1.1 Background
    1.2 A Brief Historical Perspective of GPR Development
    1.3 Problems associated with GPR Data
        1.3.1 Variable frequency antenna pairing scheme
        1.3.2 Frequency Band adjustment match filtering
    1.4 Objectives
    1.5 Dissertation Structure
Chapter 2 Ground Penetrating Radar
    Overview
    2.1 Introduction
    2.2 Basic Ground Penetrating Radar System
    2.3 The working performance of GPR
    2.4 Data Acquisition modes
        2.4.1 Antenna Orientations
    2.5 Advantages and Disadvantages of GPR
    2.6 Basic GPR related Principles
        2.6.1 Electromagnetic Properties of Material
            2.6.1.1 Permittivity
            2.6.1.2 Relative Permittivity
            2.6.1.3 Magnetic Permeability
            2.6.1.4 Electric Conductivity
        2.6.2 Data Acquisition Parameters
            2.6.2.1 EM Wave Propagation Velocity
            2.6.2.2 Wavelength of EM Wave and Resolution
        2.6.3 Relationship to Seismic Wave propagation
        2.6.4 Estimation of Depth and Layer Thickness
        2.6.5 Target Oriented Reflections and Identification
        2.6.6 Noise and Clutter
    2.7 Display of GPR Data
Chapter 3 Combinations of Variable frequency antennas and their response
    Overview
    3.1 Introduction
    3.2 Description of Study Area
    3.3 Methodology/Survey Procedure
    3.4 Analysis
x-R_x frequencies antenna pairs">    3.5 Comparison of interchangeable T_x-R_x frequencies antenna pairs
        3.5.1 Pair-1 50MHz-100MHz and 100MHz-50MHz
        3.5.2 Pair-2 50MHz-200MHz and 200MHz-50MHz
        3.5.3 Pair-3 100MHz-200MHz and 200MHz-100MHz
    3.6 Case Studies
    3.7 Summary
Chapter 4 Frequency Band Adjustment based Matching Filters for GPR Data
    Overview
    4.1 Introduction
    4.2 Data Acquisition Procedure
    4.3 Theoretical Perspective
    4.4 Filter fabrication Procedure
        4.4.1 Constant Transmitting Frequency （CFT） FBA Match Filter
        4.4.2 Similar Transmitting-Receiving Frequency （SFT） FBA Match Filter
        4.4.3 Variable Transmitting Frequency （VFT） FBA Match Filter
    4.5 Application results of the filters
        4.5.1 CFT FBA Match Filter
        4.5.2 SFT FBA Match Filter
        4.5.3 VFT FBA Match Filter
Chapter 5 Conclusions and suggestions
    Overview
References
Disseminations
Project Funding
Glossary



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