What is Ground Penetrating Radar or GPR

GPS Is A Geophysical Method That Uses Radar Pulses To Image The Subsurface.

In a sentence, Ground Penetrating Radar, or GPR, is a method of viewing buried infrastructure, objects located underground, without digging.

HOW IT WORKS

GPR uses an antenna to emit radio waves into the ground. As waves bounce off buried objects, the antenna records the strength and time it takes for the wave to bounce back to the receiver. When the radio wave hits an object with different properties than the material surrounding it, it produces a reflection. The amplitude or strength of the reflection is based on the difference in conductivity and dielectric permittivity of the two materials. Reflections are recorded as scans. GPR Radio waves are emitted in a cone shape, not a straight line. This results in an object being recorded as a hyperbola, or inverted U shape on the receiver screen. The object is actually located at the peak amplitude of the hyperbola. The higher the frequency of the antenna, the shallower into the ground it will penetrate. A higher frequency antenna will also ‘see’ smaller targets.

DATA PROCESSING

Most GPR scans are done with as a “Utility Scan.” Radio signals are emitted and discovery is interpreted real time, onsite. Some clients request a more detailed 3D GPR scans, to be post- processed by specialized computer software. The 3D scan creates a depth slice is a 3D view of the ground at a certain depth. The technician can use this model to map exactly where, and at what depth objects are located underground.

Our Equipment

Omega Mapping Services uses Geophysical Survey Systems International (GSSI) SIR 4000 systems. These top-of-the-line systems may use either a digital and analog antenna. Weighing in at 10 pounds, the system is nimble to use for large jobs which take an extended period of time. The GSSI SIR 4000 system allows in-field data interpretation, which saves time for both the technician and the client.

Limitations

GPR uses an antenna to emit radio waves into the ground. As waves bounce off buried objects, the antenna records the strength and time it takes for the wave to bounce back to the receiver. When the radio wave hits an object with different properties than the material surrounding it, it produces a reflection. The amplitude or strength of the reflection is based on the difference in conductivity and dielectric permittivity of the two materials. Reflections are recorded as scans. GPR Radio waves are emitted in a cone shape, not a straight line. This results in an object being recorded as a hyperbola, or inverted U shape on the receiver screen. The object is actually located at the peak amplitude of the hyperbola. The higher the frequency of the antenna, the shallower into the ground it will penetrate. A higher frequency antenna will also ‘see’ smaller targets.

Want To Learn More If GPR Can Help You?

478-747-3747
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