摘要
实现了利用探地雷达直达波的包络峰值处瞬时频率来估计品质因子Q值的方法。地震理论中的子波可以由4个参数:调制频率,子波的能量衰减因子,以及子波的幅度和相位来确定。在水平层状介质中,设每层的Q值为常数(即Q值和频率无关),从平面波的单程波传播理论的频率域方程出发,借助包络峰值处瞬时频率的定义,经过公式推导可知,Q值由包络峰值处的瞬时频率的变化,传播时间以及子波能量衰减因子共同确定,得到了利用探地雷达垂直雷达剖面数据(Vertical radar profiling,VRP)资料直达波的包络峰值处瞬时频率来估计Q值的方法。利用理论合成的实验数据以及野外实际数据对该算法的有效性和准确性进行了验证。
The wavelet is confirmed by modulation frequency,energy attenuation factor of wavelet,the amplitude and phase of wavelet in seismic theory.Drawing lessons from this theory in this paper,the Q value is set as a constant in each layer of horizontally layered medium （Q value is independent of frequency）.Firstly,the frequency-domain equation of the single pass propagation theory of plane wave is solved.Through the definition of envelope peak instantaneous frequency and the derivation of equation,it is shown that Q value is confirmed by the changes of envelope peak instantaneous frequency,the travel time and the wavelet energy attenuation factor.So the method to estimate Q value using envelope peak instantaneous frequency of VRP（vertical radar profiling） data direct wave of ground penetrating radar is obtained.At last,the effectiveness and accuracy of the method are verified using synthetic VRP data,synthesis experimental data and practical data.
出处
《数据采集与处理》
CSCD
北大核心
2014年第4期615-619,共5页
Journal of Data Acquisition and Processing
基金
国家自然科学基金(61302172)资助项目
辽宁省博士启动基金计划(20131085)资助项目
辽宁省教育厅科学研究(L2013069)资助项目
2013年东方地球物理公司中青年科技创新基金(11-06-2013)资助项目
关键词
探地雷达
瞬时频率
品质因子
子波
ground penetrating radar （GPR）
instantaneous frequency
quality factor
wavelet
