What is GPR?
Ground-penetrating radar is fast becoming a viable technology worldwide for surveying subsurface features and defects in flexible and rigid pavements. GPR has the potential to be used for a variety of pavement applications, including measuring the thickness of asphalt pavement, base and sub-grade; assisting in the analysis of rutting mechanisms and locating subsurface objects.
GPR operates by transmitting short pulses of electromagnetic energy into the ground. The reflected images of these pulses are analyzed using one-dimensional electromagnetic wave propagation theory. These pulses are reflected back to the antenna with amplitudes and arrival times that are of the dielectric constants of the material layers.