Under-pavement water-filled foreign body detection method based on time reversal

The invention discloses an under-pavement water-filled foreign body detection method based on time reversal. Based on the concept of time reversal, the most important Green function in time reversal is corrected precisely by analyzing multiple reflections and transmissions of electromagnetic wave underground. Then, original data is preprocessed using the original Green function and the corrected Green function respectively, and the preprocessed data is imaged by use of a backward scattering projection algorithm (BP). Water accumulated under the pavement can be detected in a targeted manner by making good use of ground penetrating radar. The method has the characteristics of strong pertinence, good timeliness, and clear recognition. 本发明公开种基于时间反转的路面下充水异质体检测的方法，结合时间反转的概念，通过分析电磁波在地下的多次反射与透射，对时间反转中最重要的格林函数进行精确地修正，然后分别用原始格林函数和修正后的格林函数对原始数据进行预处理，进而利用后向散射投影算法（BP）对预处理后的数据成像处理。本发明可以很好的利用探地雷达针对性的对路面下积水作出检测，具有针对性强、时效性好、识别度清晰特点。