Ground-penetrating radar (
GPR) is a
geophysical method that uses
radar pulses to
image the subsurface. This
nondestructive method uses
electromagnetic radiation in the
microwave band (
UHF/
VHF frequencies) of the
radio spectrum, and detects the reflected signals from subsurface structures. GPR can have applications in a variety of media, including rock, soil, ice, fresh water, pavements and structures. In the right conditions, practitioners can use GPR to detect subsurface objects, changes in material properties, and voids and cracks.