Sensors & Software Inc. NG250 Benutzerhandbuch
Noggin
G-3
wavelet or EM pulse
Impulsive GPR's emit an oscillatory electromagnetic pulse which is short in time
and space and is often referred to as a wavelet.
and space and is often referred to as a wavelet.
penetration depth
The depth of a GPR wavelet can penetrate to before it is attenuated to an unde-
tectable amplitude.
tectable amplitude.
air waves
GPR systems can create and detect energy which travels through air above the
ground. Undesired responses from above ground targets are often called 'air
waves'.
ground. Undesired responses from above ground targets are often called 'air
waves'.
G-3 Advanced GPR Terms
GPS
global positioning system (satellite based positioning).
DMI
distance measuring indicator.
stacks
number of repeated measurements averaged to get resulting measurements.
reflectivity
measure of amplitude returned by a target.
reflection coefficient normally named fresnel reflection coefficient and quantifies GPR signal reflection
amplitude from a flat interface between two materials.
3 dB bandwidth
Range of spectrum over which the GPR signal amplitude remains above a value
equal to the (peak amplitude).
equal to the (peak amplitude).
6 dB bandwidth
Range of spectrum over which the GPR signal amplitude remains above a value
equal to the (peak amplitude).
equal to the (peak amplitude).