基于Hilbert-Huang变换的探地雷达信号增强及复信号分析

阐述了Hilbert-Huang变换原理,着重讨论了EMD分解应满足的条件及具体分解过程.以黑麋峰抽水蓄能电站进厂交通隧洞实测GPR剖面为例,应用EMD分解去除部分噪声,再利用Hilbert变换求取GPR剖面复信号,提取瞬时振幅、瞬时相位、瞬时频率3个参数,绘制出相互独立的瞬时参数剖面图,根据不同地质状况进行多参数综合解释.结果表明,该方法避免了使用单一时距剖面分析所造成的解释偏差,能够更好地对异常信息做出反映,提高了GPR数据的解析精度.

SIGNAL ENHENCEMENT AND COMPLEX SIGNAL ANALYSIS OF GPR BASED ON Hilbert-Huang TRANSFORM

The theory of Hilbert-Huang transform is described in this paper. Exemplified by the measured GPR profile of the tunnel leading to the factory of the Heijunfeng Pumping Energy Storage Power Station, the authors applied the EMD method to eliminate partial noises, used the Hilbert-Huang transform to calculate the complex signal of GPR profile, and extracted three parameters, i. e. , the instantaneous oscillation amplitude, the instantaneous phase and the instantaneous frequency. On such a basis, the mutually independent instantaneous parameters profiles could be drawn up. Multiple parameters integrated interpretation was conducted according to different geological conditions. The results show that this method can avoid the explanation error caused by using single time distance profile analysis, and can better reflect the anomaly information, thus improving the GPR data analysis precision.