Sensors & Software pulseEKKO Product Manual page 58

3.4.7 GPR System Parameters
The following table lists suggested GPR parameters based on the maximum SmartChariot
speed of 25 kph (15 mph). These can be set in the
3.4.8 Tips for Using the SmartChariot
Step Size
Many pavement structures contain asphalt over concrete which can be difficult to distinguish in
the GPR cross-section. Most concrete is reinforced with metal rebar which can be seen in the
GPR cross-section when the step size is set to a resolution that is small enough to identify
individual pieces of rebar. Set step size to a maximum of 5cm to identify this type of pavement
structure.
SmartChariot Odometer Calibration
Although typical SmartCart/SmartTow odometer calibrations are completed on short lines,
SmartChariot odometer calibrations should be completed on 20m long lines.
Zoom (Position)
The SmartChariot can collect GPR data very fast and the data on the DVL screen may scroll too
quickly to view the image in real time. You can change the zoom to increase the total distance
shown on one screen (7.1.4). This causes the screen to scroll more slowly, making the data
image more visible.
Skipped Traces
The system will occasionally skip traces. Typically, only a few traces will be skipped but
thousands will be collected so it's not usually an issue. For an explanation of skipped traces,
see Show Skips under
Parameter
Depth (m)
Transducer
Stacks
Trigger Method
Step Size (cm)
GPR Line Options (5.1.10).
System Configuration
GPR Sensor (MHz)
500 1000
1.5 0.75
500 1000
1 1
Odometer
5 cm 5 cm
46
Assembling Full Configurations
(6).