What is Ground Penetrating Radar?
Ground Penetrating Radar (GPR)
The technology uses electromagnetic (EM) waves transmitted from an antenna (which reflects on layers and objects in the ground. These reflections are received with an antenna (Rx) and create a picture of the subsurface. As the transmitting and receiving antenna is moved along the surface, recordings are collected and displayed side by side, resulting in a cross section, also known as radar profile.
GPR can be used in a variety of media including rock, soil, ice, fresh water, concrete, pavements and structures, and it can detect objects, voids, cracks and changes in material.
The resolution and investigation depth is depending on the antenna frequency used; most often ranging from 10 MHz to 2.3 GHz. High frequency antennas give high resolution images but low penetration, and low frequency antennas gives better penetration depth with lower resolution.