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硕士学位论文 探地雷达成像算法研究及实现，正文共72页。

【摘要】 探地雷达是一种利用地下介质的不连续性来探测地下目标的有效工具,具有探测速度快、探测过程连续、操作方便灵活、分辨率高、不损坏被探测目标等特点。本文研究的是浅地层探地雷达的信号处理,主要包括杂波抑制和目标成像。浅地层是指目标深度在0.5米以内的范围,在这个深度上,地下环境复杂,地面反射及其他因素对目标回波的影响较大,如果不加以处理,目标信号将被其他杂波淹没。因此,杂波抑制是浅地层探地雷达信号处理的一个重要任务,也是对目标数据进行成像等后续处理的基础,本文对此做了研究。目标成像可以获得对目标直观的认识,目前,目标成像研究主要集中在对目标B-scan数据进行二维成像以及旨在提高方位分辨率的合成孔径成像上。本文即研究了对目标进行合成孔径成像的方法以及基于Stolt偏移的目标三维成像算法,并进行了使用Matlab和Visual C++混合编程对目标三维成像算法进行了实现,取得了较好的效果。此外,本文还对探地雷达的数据采集和处理软件进行了改进和完善。本文的主要工作如下:1.研究了探地雷达回波信号杂波及背景去除算法,改进了一种基于A-scan信号强度的自适应滑动平均法;2.改进并完善了探地雷达数据采集处理软件,加入了定位轮控制数据采集、数据格式转换、目标距离测定等程序;3.研究了探地雷达目标成像算法,利用动态链接库技术实现了在脱离Matlab环境下在Visual C++编写的程序中调用Matlab程序对目标进行三维成像的功能;4.参加外场实验及项目验收。

【Abstract】 The ground penetrating radar (GPR) is an effective tool to detect buried targets based on the dielectric discontinuity, which possesses a lot of virtue, such as rapid and continuous surveying, simple and convenient operation, high resolution, nondestructive detection etc. This dissertation studied shallow depth signal processing technology of GPR and focused on the clutter reduction and targets imaging. Shallow depth refers to the targets’depth within 0.5m. The clutter and ground surface reflection is severe due to the complex environment and other factors on this depth of ground, so the targets signal will be impact without processing. Presently, the study of targets imaging focuses on 2D imaging and the main objective is to enhance the azimuth resolution via synthetic aperture imaging method. A method to give the 3D targets image based on mixed programming of Matlab and Visual C++ has been proposed and, the data acquisition and processing software has been improved and perfected also.The contents and innovations of this dissertation are as follows:1. Studied the cluster and background reduction algorithm and, proposed an enhanced adaptive step average method based on the amplitude of A-scan signal;2. Improved the GPR data acquisition and processing software, some utilities have been added such as position wheel control program, data format translation etc.;3. Implemented 3D targets imaging using mixed programming of Matlab and Visual C++;4. Participated in the outfield experiments.

【关键词】 探地雷达； 杂波抑制； 三维成像； 混合编程；

【Key words】 GPR； Cluster reduction； 3D imaging； mixed programming；

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