中文摘要：

基于公路长期经受日晒、风雨等因素的侵蚀,使公路产生裂痕从而在下方形成积水,导致公路地基变形等问题。针对这一现象,提出了利用探地雷达结合时间反转算法对地下充水异质体进行检测的方法。首先,利用时间反转算法基本理论,通过多层介质下电磁波多次反射与透射修正格林函数,对得到的原始数据进行预处理,进而提高目标分辨率;最后,利用后向投影（BP）成像算法实现对地下充水异质体的检测。实测数据验证了理论的正确性。

英文摘要：

Due to highway which has been exposed to sun,wind and rain,it＇ s easy to lead the formation of water under the road causing crack. As time passes,the distortion of highway subgrade is caused and is harm to road health. In reaction to phenomenon,a method that is detecting hydrous heteroplasmon under road based on time reversal by GPR is proposed. First,the green function by reflection and transmission of electromagnetic wave of layered media to original data to preprocessing by fundamental time reversal theory is amended,and then reach to resolution enhancement of target,finally finish the detection of hydrous heteroplasmon under highway by BP imaging algorithm. The accuracy of theory is validated by the actual measurement data.