摘要
以湖南省张家界—花垣县高速公路岩溶勘查为例,探讨探地雷达在竖直型岩溶勘查中的应用和效果;同时,说明复信号分析方法在探地雷达数据处理中的有效性。竖向岩溶的横向规模小,在雷达图像中相应的异常范围比较窄,异常不易分辨。首先对原始采集信号进行二维空间域滤波,再对信号进行H ilbert变换,提取雷达信号的瞬时振幅、瞬时相位和瞬时频率,然后对这些处理后的信号进行综合分析。研究结果表明,二维空间域滤波可大大消除高频噪声的干扰,提高信号的信噪比,多参数综合分析可提高探地雷达解释的精度,最终的钻探成果也验证了反演解释结果的正确性。
Horizontal karst caves were frequently studied for geohazards prospecting in the past.In this paper,the application of GPR to vertical karst caves was introduced in Zhangjiajie-Huayuan Expressway of Hunan Province,and the effectiveness of the complex signal analysis was illuminated in GPR data processing.A vertical karst cave characterized by a small horizontal scale would arose an unintelligible anomaly in the GPR image,which could not be recognized easily.The authors first processed the GPR data by two-dimensional spatial filter,and then applied Hilbert transform to the data,thus obtaining the transient amplitude,transient phase and transient frequency.Finally,the authors analyzed the processed data synthetically.The results show that the spatial filter can remarkably eliminate high frequency noise and improve SNR of the signal.In addition,the accuracy of the GPR interpretation can be improved by the multi-parameter analytical method.Drilling results prove the correctness of the inversion interpretation.
出处
《物探与化探》
CAS
CSCD
北大核心
2011年第2期280-284,共5页
Geophysical and Geochemical Exploration
基金
教育部高等学校特色专业建设点项目(TS11027)
