Most ground penetrating radar (GPR) data is obscured by some noise. The most common is horizontal banding that can hinder your ability to interpret reflection events of interest. In this video, I go over three reasons why horizontal banding occurs in your GPR data, how you can remove it with a background filter, and a note of caution so you don’t remove the reflection anomalies that you are actually interested in.
So why does horizontal banding occur? First, the system itself can cause it. Second, the surveyor (Yes…YOU!!!) can cause it. And third, some obstruction that is parallel to your transect can cause it.
You can remove this distortion by applying a background filter. A background filter removes the average amplitude values at every depth interval, leaving you with, hopefully, only your targets of interest. It removes the average, but keeps the amplitudes that are higher than the average which should be the ones that actually reflected off of your target.
But be careful!!! It is possible to remove the reflections you are interested in if they are linear (horizontal). So be make sure you don’t do this.
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