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首页> 外文会议>Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments >Time-Frequency Analysis of GPR Simulation Signals for Tunnel Cavern Fillings Based on Short-Time Fourier Transform
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Time-Frequency Analysis of GPR Simulation Signals for Tunnel Cavern Fillings Based on Short-Time Fourier Transform

机译：基于短时傅里叶变换的隧道洞室充填物探地雷达模拟信号时频分析

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The most important factor in restricting safe and efficient is the unfavorable geological conditions ahead of the tunnel face during tunnel construction in karst area. To avoid the occurrence of geological disasters, advanced geological forecast technology is widely used to detect the development of unfavorable geological bodies. In order to better explain the time-frequency characteristics of GPR signals of tunnel cavern fillings, the Gaussian window function is selected according to the uncertainty principle, and the short-time Fourier transform is used to analyze and process the GPR signals of cavern fillings with different properties based on forward simulation. The results show that the time-frequency spectrum based on short-time Fourier transform can meticulously describe the process of change that takes places in time and frequency plane of GPR signals, which is beneficial to accurately extract the time-frequency characteristic parameters in GPR signals. When the electromagnetic wave wavelength of the GPR transmitting antenna is shorter than the detection depth of cavern fillings, two target reflectors which reflect the upper and lower reflecting interfaces of the fillings will appear in the spectrum of forward simulation signal. The relative errors of recognition results obtained according to the reflection time interval are all less than 5%, which provides a reference for the quantitative interpretation of GPR signals of tunnel cavern fillings.
机译：岩溶地区隧道施工中，隧道前方的不良地质条件是制约隧道安全高效运行的最重要因素。为了避免地质灾害的发生，先进的地质预报技术被广泛应用于探测不良地质体的发育。为了更好地解释隧道洞室充填物探地雷达信号的时频特性，根据测不准原理选择高斯窗函数，并在正演模拟的基础上，采用短时傅里叶变换对不同性质的洞室充填物探地雷达信号进行分析和处理。结果表明，基于短时傅里叶变换的时频谱能够细致地描述探地雷达信号在时间和频率平面上的变化过程，有利于准确提取探地雷达信号的时频特征参数。当探地雷达发射天线的电磁波波长小于洞室填充物的探测深度时，正演模拟信号的频谱中会出现两个目标反射器，分别反射填充物的上下反射界面。根据反射时间间隔得到的识别结果的相对误差均小于5%，为隧道洞室充填物探地雷达信号的定量解释提供了参考。

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