Ground Penetrating Radar Fast Back Projection Imaging Technique of Targets Located in Two Layered Medium

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.