【作者】 杨建广；

【导师】 吕绍林； 汤井田；

【作者基本信息】 中南大学 ， 地球探测与信息技术， 2002， 硕士

【摘要】 层状介质中的雷达信号处理研究 作者对数字信号处理的理论和方法进行了分析和研究，对把纯数字信号处理领域内的新技术、新方法引入到高频电磁波信号处理中作了有益的尝试。在基于对高频电磁波传播规律和对数字信号处理方法和原理的基础之上，作者将在地震、大地电磁勘探、超声波检测、无损检测等领域内广泛应用的一些数字信号处理技术引入到探地雷达的数字信号处理中，并将小波分频提取信号引入到探地雷达的信号处理中，工程实践表明该方法确实可行有效。该方法的提出拓宽了小波分析的应用领域，为更好地解决高频电磁波数字信号处理问题提供了新的思路。作者将该方法融合到其它一些信号处理的流程之中，形成了一套独具特色的高频电磁波信号处理方法。 本文首先以麦克斯韦方程组为中心，对高频电磁波在有耗介质中的传播规律作了探讨，并以此知识为基础对探地雷达波的波场作了定性分析。文章其次对数字信号处理的理论、常用方法和技术作了简要概述，并对小波分频提取信号和复信号分析技术引入到探地雷达信号处理中的可行性做了分析。在分别介绍这些方法时文章都附以实例验证了这些方法引入到探地雷达信号处理中的有效性。有了以上这些知识和技术作基础后，作者重点对本文的中心：如何在高噪声背景条件下提取出有效信号并对该信号进行处理这一问题提出了作者自己的解决办法。经实践证明这些方法是行之有效的。为将这些方法和技术应用于工程实践，作者以Vsual Basic和MATLAB为编程语言，将以上这些方法技术编成了数字信号处理软件。该软件采用各功能模块独立设计，包括格式数据文件的读入、信号特征分析、信号的处理和资料的成图可视化等功能模块。经过运行测试和多项工程实践检验表明，该软件是能满足实际工作的需要的，对实际工程实践是具有一定的指导意义的。更多还原

【Abstract】 The author analyses and studies systematically the theories and methods of digital signal process; Having done a lot of beneficial attempt to introduce the new technologies and new methods from the pure digital signal process into the high-frequency electromagnet waves digital signal process. Based on the wholly-understanding of the transmit metrics of the high-frequency electromagnet and the principles of the digital signal process, the author introduce plenty of processing methods which are widely used in seismic, ground-electromagnet exploration, super-sound wave detecting, etc. into the high-frequency electromagnet waves digital signal process; and creatively put forward a new concept: wavelet divided-frequency. It’s proved by project and practices that this new method is really efficient and useful. This method widens the range of application of wavelet analysis theory, and provide a new thought for resolving the problem of high-frequency electromagnet waves digital signal process. The author adds this method to the signal process procedure and forms a set of high-frequency electromagnet waves digital signal process method with special feature.Firstly, the paper states the common theory knowledge about electromagnet transmitting; discusses its application conditions, integral forms, boundary conditions, resoling methods, etc, and extends these methods into the attrition media; discusses the transmitting principles of the high-frequency electromagnet waves transmits in the attrition media, and use these knowledge to analyses the GPR’s wave field. Secondly, the paper make a brief introduction of the theories, methods and technologies about the digital signal process. For the sake of simplification, the paper mainly discusses these methods which are used by the author: move-average method, wavelet-divide frequency, complex analysis, deconvolution, line-average, correlation analysis, etc. the paper adds a lot of practical examples to prove their efficiency and usefulness. After introduction these knowledge, the author put forward his resolving methods to this problem: how to get the useful signal from the high noise background and process the useful signal? It’s proved by practices that the author’s methods are efficient. In order to apply these technologies into the practice, the author has developed a useful software in Visual Basic and MATLAB. This software’s models are designed independently, including data I/O, signal feature analysis, signal process and the visual data...,etc. By running test and several projects practice, It’s proved that this software can satisfies the practice’s demand and it has the guide meaning to the project practice.更多还原