基于探地雷达的机场场道脱空层检测及厚度估计

Void-layer Detection and Depth Determination in Runways based on GPR

机场道面的脱空状况对机场场道的质量检测、定期维护具有十分重要的意义。探地雷达在机场道面脱空检测中有着非常好的效果,本文研究了基于探地雷达的机场场道道面脱空层检测及其厚度估计问题。首先,将时频分析方法——S变换引入到机场道面脱空薄层的检测中,利用脱空薄层反射回波所对应的S变换波形的底部失真特性检测脱空薄层,这是基于S变换检测机场场道脱空薄层的首次尝试。同时利用改进的电磁波在道面下多层介质中的传输模型及系统辩识方法,成功提取了与脱空薄层上下界面所对应的时域脉冲对,基于谱反演优化算法实现脱空薄层的厚度估计。仿真结果证明了本文方法的有效性,且脱空薄层厚度估计误差控制在5%以内。

Void condition is an important factor for runways quality evaluation and surveillance.Ground Penetrating Radar （GPR） is widely applied in the quality surveillance of runways.Void-layer detection and thickness determination in runways based on GPR are studied in this paper.Void-layer is thin layer whose thickness is very small（usually less than 1 cm）.Firstly,the void-layer can be detected based on its time-frequency distribution characteristic of S transform.This is the first attempt of S transform to be used in the void-layer detection of runways.In the same time,the depth of void-layer can be evaluated based on spectrum optimisation inversion method,in which the impulse pair in the time domain corresponding to the upper and bottom interface of void-layer can be extracted based on the improved EM wave propagation model and system identification method we have proposed in other paper.The results demonstrate the method is valid and the estimation error of thickness is within 5%.