Both air coupled and ground coupled GPR have various benefits and drawbacks. These configurations should each be considered based on the project site conditions and project goals. One of the important benefits of air coupled GPR systems is that the direct wave and the ground wave are distinct.

This helps in a few ways: 1) the polarity sequence of the ground reflection can clearly be identified because the direct wave doesn’t mask the ground wave. The are separated from each other allowing the technician to clearly identify the signature of signal slowdown (low K to high K). This can aid in deeper analysis of subsurface responses and mapping stratigraphy. 2) The user can define the actual part of the signal related to the ground reflection that he or she wants to place as time-zero. There is no overlap of the direct and ground responses so only the ground can be used if the professional chooses.

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