What is GPR?
GPR stands for Ground Penetration Radar and has a variety of appellations such as; ground probing radar, surface penetrating radar, impulse radar or subsurface radar.
GPR is a technique that detects electrical discontinuities in shallow surfaces by processing distinct pulses of a high frequency of electromagnetic energy.
How it works.
Ground Penetration Radar operates by sending a mini pulse of energy into a substance and then keeps a record of the strength and time required for any reflected signal to return. These reflections are generated when the energy pulses enter into a substance or material with different properties of electrical conduction from the material it left.
Uses of Ground Penetration Radar.
GPR is used in a variety of fields such as archaeology, vehicle localization, military, and three-dimensional imaging.
1. Archaeological use. With the help of GPR, the signal of the radar signal is sent into the earth. Surface objects then cause reflections that a receiver picks up.
GPR can be used to locate map features and artifacts without the danger of damaging them and also has the unique potential to detect tiny objects at substantial depths as well as differentiate the depth of divergent sources.
2. Vehicle localization
Localizing Ground Penetrating Radar is a new approach to vehicle localization that uses prior map based images and has been able to demonstrate centimeter level accuracies at a speed of 60 miles per hour.
3. In the military.
A typical use of Ground penetration radar in the military is to detect tunnels and unexploded ordnance. Sometimes it is used together with other geophysical methods like electromagnetic induction and electrical resistivity.
4. For 3-dimensional imaging.
Collective lines of data derived methodically over an area are useful in the construction o 3-dimensional images.
5. GPR is often used on TIME TEAM (a British television series) to determine whether an area can be examined by excavation.