中文摘要：

运用探地雷达对分层介质中的目标进行探测时,时域后向投影算法是一种常用的成像方法。但大运算量和低成像分辨力一直是该算法难以实用化的瓶颈问题。该文提出一种实用的高分辨快速后向投影成像方法。首先提出了基于1维搜索或求解一元四次方程的传播时延快速计算方法。其次,设计了一种对时延曲线上散射回波进行处理的加权因子以提高成像质量。运用所提的成像算法对仿真数据进行了处理,获得了高分辨的成像结果,验证了该算法的有效性和快速运算能力。

英文摘要：

In Ground Penetrating Radar（GPR） applications such as detection of targets located in layered medium,the time-domain Back Projection（BP） imaging algorithm is a commonly used imaging technique.However,the heavy computation burden and low-quality imaging results limit the practical application of this algorithm.This paper presents a new Fast Back Projection（FBP） high-resolution imaging method.Firstly,a new fast time-delay calculation method based on one-dimensional search operation or a quadratic equation solving operation is presented.Secondly,a new method to improve the quality of imaging results by using weighted factor is presented and a typical weighted factor is designed.Through processing simulation data,the FBP imaging results show that the algorithm can be applied effectively to the target imaging embedded in two layered medium.