关键词: 岩土工程, 探地雷达, 岩体结构特征, 子空间, 多信号分类

Abstract: Ground penetrating radar was taken as a feasible remote sensing tool for surveying subsurface geo-structure. This structural information was recorded in radar signal profiles by means of echo signal detection, amplitude, and phase estimation. Besides the energy attenuation and absorption of GPR EM pulse during its propagation into the subsurface from a transmitting antenna, the strong interferences, clutters, background scatters, random noises, and multiples often make the weak signal of structure signatures hardly distinguishable. Furthermore, detecting fractures with multiple signal classifications on subspace is difficult. With experimental field surveying data, it is illustrated that this method can achieve efficiently sparse representation of subsurface structure and yields discriminative fracture signatures for geological interpretation.

Key words: geotechnical engineering, ground penetrating radar, characteristics of rockmass structures, subspace, multiple signal classification