GPR

A ground penetrating radar system, or GPR, consists of an electromagnetic sender and receiver. This system emits a high-frequency radio pulse through the sending coil which reflects on individual layers or objects in the soil.

In surveys, the ground radar system takes semi-continuous measurements whilst moving: pulses are emitted dozens of times per second with their reflection times being recorded (and therefore the depth of the object reflected). The position of the system is recorded simultaneously by means of a dGPS system. These measurements can be carried out by walking/driving.

There are a lot of applications for a GPR, a few examples are: detection of cables and pipes, investigation of dump sites (thickness of covering layer, extents), archeological investigation.