The multilayer nature of airport pavement structures is susceptible to the generation of voids at the bonding parts of the structure, which is also called interlayer debonding. Observations have shown that the thickness of the resulting voids is usually at the scale of millimeters, which makes it difficult to inspect. The efficient and accurate characteristics of ground penetrating radar (GPR) make it suitable for large area inspections of airport pavement. In this study, a multistatic GPR system was used to inspect the interlayer debonding of a large area of an airport pavement. A special antenna arrangement can obtain common-midpoint (CMP) gathers during a common-offset survey. The presence of interlayer debonding affects the phase of the reflection signals, and the phase disturbance can be quantified by the wavelet transform. Therefore, we have developed an advanced approach that uses the average entropy of the wavelet transform parameters in CMP gathers to detect the interlayer debonding of airport pavement. The results demonstrate that the regions with high entropy correspond to regions where tiny voids exist. The new approach introduced in this study was then evaluated by a field-base experiment at an airport taxiway model. The results show that our approach can detect interlayer debonding of the pavement model accurately and efficiently. On-site coring results confirm the performance of our approach.

中文翻译：

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基于多点探地雷达系统的机场路面检查小波熵研究

机场路面结构的多层性质易于在结构的结合部分产生空隙，这也称为层间剥离。观察表明，所产生的空隙的厚度通常为毫米级，这使其难以检查。探地雷达（GPR）的高效和精确特性使其适用于机场道路的大面积检查。在这项研究中，多静态GPR系统用于检查机场人行道大面积的夹层脱胶。特殊的天线布置可以在公共偏移量测量期间获得公共中点（CMP）收集。层间剥离的存在影响反射信号的相位，并且相位干扰可以通过小波变换来量化。所以，我们已经开发出一种先进的方法，该方法使用CMP道集中的小波变换参数的平均熵来检测机场路面的层间剥离。结果表明，具有高熵的区域对应于存在微小空隙的区域。然后，通过机场滑行道模型的现场试验对本研究中引入的新方法进行了评估。结果表明，我们的方法可以准确，有效地检测路面模型的层间剥离。现场取芯结果证实了我们方法的性能。然后，通过机场滑行道模型的现场试验对本研究中引入的新方法进行了评估。结果表明，我们的方法可以准确，有效地检测路面模型的层间剥离。现场取芯结果证实了我们方法的性能。然后，通过机场滑行道模型的现场试验对本研究中引入的新方法进行了评估。结果表明，我们的方法可以准确，有效地检测路面模型的层间剥离。现场取芯结果证实了我们方法的性能。