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GPR
How it works
Ground Penetrating Radar (GPR) uses radar pulses to detect and image underground objects and features. A GPR transmitter emits electromagnetic energy into the ground. When the energy encounters a buried object or a boundary between materials having different dielectric permittivities (a property that defines the speed of electromagnetic waves), it may be reflected to the receiving antenna of GPR. The GPR electronics can then record the variations in the return signal.