GPR GPR Signal Processing & Analysis

Question 1

What is the primary purpose of applying a time-zero correction in GPR data processing?

Accepted Answer

To align the first arrival wavelet to the surface interface

Answer

To amplify weak reflections

Answer

To remove horizontal banding artifacts

Answer

To increase the scan frequency

Question 2

Which processing step is used to compensate for signal attenuation with increasing depth in GPR data?

Accepted Answer

Gain function application

Answer

Dewow filtering

Answer

Bandpass filtering

Answer

Migration

Question 3

What does 'dewow' filtering remove from GPR data?

Accepted Answer

Low-frequency drift or 'wow' in the time domain

Answer

High-frequency noise

Answer

Multiples and reverberations

Answer

Surface clutter from air waves

Question 4

In GPR processing, what is the goal of migration?

Accepted Answer

To collapse hyperbolic diffractions to their true point source locations

Answer

To convert time to depth using a velocity model

Answer

To remove ringing caused by metallic objects

Answer

To apply frequency filtering to improve resolution

Question 5

A bandpass filter in GPR processing is primarily used to:

Accepted Answer

Limit the frequency content to a range that reduces noise while preserving target reflections

Answer

Convert the signal from time domain to depth domain

Answer

Remove all reflections below a specified depth

Answer

Enhance horizontal coherence across traces

Question 6

Which velocity analysis method uses the shape of hyperbolic diffractions to estimate subsurface EM velocity?

Accepted Answer

Hyperbolic fitting

Answer

Common midpoint (CMP) gather

Answer

Spectral analysis

Answer

Cross-correlation