探地雷达子波衰减频散机理及相应的反Q滤波方法研究

项目名称： 探地雷达子波衰减频散机理及相应的反Q滤波方法研究

项目编号： No.40874073

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 刘四新

作者单位： 吉林大学

项目金额： 44万元

中文摘要： 项目针对探地雷达探测中存在的子波频散和分辨率降低等问题,展开Q值计算及反Q滤波的研究。取得以下成果：(1)研究复杂地质介质中雷达波传播的频散和吸收机制，发现并证实随着时间的推移，雷达子波变宽且中心频率降低；(2)实现了两种Q值计算的方法，频移法和谱比法，可对层状介质Q值得求取；(3)实现了基于传递函数的反Q 滤波算法，并对合成数据进行计算，取得良好效果；(4)实现了基于波场延拓的反Q滤波算法，该方法可对层状介质进行反Q滤波。研究取得的反Q滤波器都是时变的，既考虑时间的变化，又考虑频率的变化，能有效补差雷达子波的频散和衰减，提高分辨率。 项目达到预期效果。

中文关键词： 探地雷达；子波频散；衰减；反Q 滤波；分辨率

英文摘要： The project carries out the research on Q caculation and inverse Q filter, focusing on the GPR related problems such as wavelet dispersion and resoulation decresing.Following achievements were obtained:(1) investigating the dispersion and attenuation mechinism for GPR wave in complicated medium, and found that the wavelet is becoming wider and central ferquency is lowered following the propagation; (2) two Q calculation schemes were obtained, the spectrum ratio method and the ferquency shift; (3)an inverse Q scheme based transfer function was obtained; and tesed with sythtic data;(4)an inverse Q scheme based on wavefield continuation was obtained,which is fitted for layered medium. The inverse Q filter is a transient one which consider both time-related change，and frequency-related change.Inverse Q filter can compensate the wavelet dispersion and attnuation. The project satifies the anticipated puspose.

英文关键词： GPR；Wavelet dispersion；Attenuation；Inverse Q filter；resoulation；Resoulation