Ground penetrating radar (GPR) is a geophysical technique that uses electromagnetic waves in the radio frequency range to investigate geologic, engineering and hydrogeologic features. Radar waves are produced by a transmit antenna, scattered from interfaces between media having contrasting intrinsic impedances, and recorded by a receive antenna. Electromagnetic waves can be described by the orientation of their electric and magnetic fields, and the direction of propagation. Polarization refers to the magnitude and orientation of the electric field as a function of time and space.
AAPG Search and Discovery Article #90926©1999 AAPG Eastern Section Meeting, Indianapolis, Indiana