3-D Targets Reconstruction Based on Stepped Frequency Continuous Wave GPR System

Ground Penetrating Radar (GPR) is a geophysical method to detect the structure and characteristics of underground burial targets by using high frequency electromagnetic wave. However, for traditional pulse GPR systems, There is still room of progress in stability and signal-to-noise (SNR) of reflections. In this work, in order to reconstruct the 3-D structure of complex objects in underground space, we apply stepped frequency continuous wave (SFCW) technology to GPR system and design a reconfigurable multistate GPR (RM-GPR). In addition, we expand back projection imaging algorithm into 3-D space and improve the computational efficiency of the algorithm by limiting the single imaging area and simplifying the self convolution process. The unique aspect of the RM-GPR system is that they can reconstruct the real 3-D contour of the targets in the underground complex space and help people to have an intuitive understanding of unknown targets in underground space.