基于谱能分析法解决地质雷达大尺度探深问题

为了突破地质雷达低频天线探测深度与辨识率之间的矛盾,满足浅埋地下工程精细化物探的需求,基于谱能分析法对常规低频天线采集的雷达信号进行后处理,通过对探测目标介质体的频响强度分析,有效提高雷达回波的识别能力,实现了较常规雷达信号处理分析方法增大2~3倍探测深度的良好效果。结合某隧道中坍塌冒顶围岩扰动影响范围的探测实例,采用100MHz低频天线及谱能分析信号后处理技术达到了100m的大尺度探深,初步解决了地质雷达大尺度探测的工程问题。

Large-scale investigation depth with GPR based on spectral energy analysis method

To break through the contradiction between the investigation depth and identification of ground penetrating radar (GPR) with low frequency antenna, and meet the need of refinement geophysical prospecting in shallow underground engineering, radar signal collected by normal low frequency antenna was post-processed based on the spectral energy analysis method. The recognition ability of the radar echo is effectively improved through frequency intensity analysis of the investigated target medium body,and the investigation depth is 2-3 times deeper than that of the normal radar signal processing method. Combined with the detecting example of the disturbance influence of the collapsed surrounding rock in the tunnel, large-scale investigation depth reaches 100 m by using 100 MHz lowfrequency antenna and signal post-processing technology of spectral energy analysis, and the engineering problem of large-scale investigation with GPR is solved preliminarily.