地質(zhì)雷達(dá)（GPR）對(duì)于地下介質(zhì)的地球物理勘查來(lái)說(shuō)是一種行之有效的技術(shù),特別是對(duì)于淺層地下來(lái)說(shuō)。無(wú)損、高效和數(shù)據(jù)可靠是它作為淺地表地下調(diào)查一個(gè)理想工具的重要因素。根據(jù)地下目標(biāo)的類型,應(yīng)用中如何選擇地質(zhì)雷達(dá)天線的中心頻率和帶寬將是一件重要的事情。實(shí)際信號(hào)的頻率同分辨率、最大探測(cè)深度、地下探測(cè)物體的大小以及土壤介質(zhì)的性質(zhì)直接相關(guān)。因此對(duì)于每一次的勘探來(lái)說(shuō),都需要研究其天線頻率的局限性。當(dāng)然,既要獲得高分辨的地下圖像（高頻）,也要有較大的探測(cè)深度（低頻）一直是技術(shù)改進(jìn)的目標(biāo)。為了從一個(gè)新的角度研究這個(gè)問(wèn)題,本論文提出了一種應(yīng)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(qiáng)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(yàn)研究中這種情況發(fā)生了改變。為了取代通常的3對(duì)相同頻率天線對(duì)觀測(cè),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(yàn)場(chǎng)地位于中國(guó)浙江杭州良渚的莫角山。通過(guò)對(duì)其接收數(shù)據(jù)的脈沖響應(yīng)的研究,我們觀測(cè)到了頻率互換的不同效應(yīng)。實(shí)際的觀測(cè)結(jié)果是:地質(zhì)雷達(dá)信號(hào)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(lái)源】：浙江大學(xué)浙江省 211工程院校 985工程院校 教育部直屬院校

【文章頁(yè)數(shù)】：111 頁(yè)

【學(xué)位級(jí)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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