A secondary reflection pattern synthesis for GPR B-scope images

UWB pulse ground-penetrating-radars (GPR) have been used for surveying underground-buried objects. In cases that multiple objects are buried at nearby sites in different depths, multipath reflections, especially, the secondary reflection waves originating from the upper objects sometimes prevent us recognizing the lower occluded objects from B-scope images. The secondary reflection wave patterns are created from the process: after being emitted from a transmitter, a pulse wave enters and exits from the ground, and arrives at a receiver where it reflects at the upper object, the ground surface, and the upper object again. This paper presents a method for synthesizing the secondary reflection wave patterns: the key idea is in the modeling for a traveling path, an intensity attenuation, and a wavelength extension. The traveling paths were defined based on the specular-reflection principle. The intensity attenuation, and the wavelength extension were modeled by some analytical functions. Effectiveness of the proposed method was confirmed through an experiment under the multi-pipe-buried condition.