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What is the frequency of GPR?

With a frequency of GPR, normally the the middle frequency of a pulsed GPR system is meant. The best frequency depends on the specific application and the depth of the target being investigated. Typically, GPR systems operate in a frequency range between 10 MHz to 2.6 GHz.

Higher frequency antennas (1-2 GHz) are generally used for shallow depth investigations (up to a few meters), such as detecting rebar in concrete structures or utility pipes in pavement. Lower frequency antennas (50-500 MHz) are used for deeper investigations (up to tens of meters), such as imaging geological structures or buried archaeological features.

However, the choice of frequency is a trade-off between depth penetration and resolution. Lower frequencies can penetrate deeper but have lower resolution, while higher frequencies can provide higher resolution but have shallower penetration depth.

Screening Eagle’s Stepped Frequency Continuous Wave (SFCW) GPRs do not face this frequency dilemma. Stepped frequency continuous wave (SFCW) can broadcast an ultra wide-band range of modulated frequencies ranging from below 500 MHz to well over 3500 MHz. The combination of all frequency response enables a detection of objects from shallow to deep depth in one scan. However, for shallow depth investigation a GP sensor offers the best resolution. Whereas for deeper penetration, a Proceq GS8000 subsurface GPR is needed.

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