There are two basic problems with 1D Ground Penetrating Radar (GPR) data that need to be corrected for.

First, the transmitting antenna bombards the receiver with energy creating a shift of the recorded signal mean (average). Because this average becomes off-set, all of the data appear as positive responses and basically become uninterpretable…i think that’s a word. To correct for this a DC shift filter would need to be applied so the average is now 0.

The second problem that GPR practitioners face is that the trace will drift from the mean over time. This means that the mean will be accurate at 5 ns in two-way travel time, but might drift from the average by 85 ns in two-way travel time. To deal with this issue a Dewow (best name for a filter of all time!) needs to be applied. This Dewow filter pulls the drift back to the mean so the trace is accurate.

If you use GPR and didn’t know how this worked, then you should get further training. Check out our upcoming webinars, classes, and live workshops at


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