Migration
Definition
A processing step that repositions reflections from their apparent location (a spread-out hyperbola) to their true subsurface location (a point or plane), sharpening the image. Hyperbolic diffraction patterns collapse to their apex position after migration.
Related terms
- Attenuation
- The reduction in radar signal amplitude with distance traveled. Electrically conductive materials (wet clay, saline soil) convert signal energy to heat, limiting...
- Dielectric permittivity (epsilon)
- A material property that controls how fast electromagnetic waves travel through it and how strongly they reflect at a boundary. Water has...
- Hyperbolic reflection
- The bowtie-shaped pattern in a GPR time section produced as the antenna passes over a point-like object. The shape is governed by...
- Time window
- The total two-way travel time recorded by the GPR per trace, effectively setting the maximum depth sampled. The time window must be...
- Velocity calibration
- The process of estimating the true electromagnetic wave velocity in the survey soil, usually by fitting a hyperbola to a known reflector...
Explained in
- GPR Signal Physics and Soil Geology EffectsA processing step that repositions reflections from their apparent location (a spread-out hyperbola) to their true subsurface location (a point or plane), shar...