User`s manual

Geophysical Survey Systems, Inc. HandySan
User’s Manual
MN70-380 Rev B 6
Radar Wave Velocity Adjustments
1. Automated processing includes Migration which removes hyperbolic reflections from the
data. Migration requires Radar Wave Velocity to be set within ½ in/ns of the exact value.
2. The exact velocity is usually not known, thus trial-and-error is the best way to determine it:
• After first processing, maximize Display Gain and see if the hyperbolas have collapsed into
dots:
Raw Data
Velocity too high Correct Velocity too low
• Correct velocity – data can be viewed in Depth Slices
• Velocity too high or too low – process again, respectively decreasing or increasing velocity
in ½ in/ns steps until image looks correct.