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Advanced GPR Settings
The advanced GPR settings allow fine tuning of the GPR detection capability.
GPR Start/Stop Gates
The GPR Start/Stop Gate Function allows the
Operator to mask detections from layers of
soil near the surface, and at the bottom of the
detectable depth range.
This helps to eliminate unwanted false alarms
from rough or uneven soil surfaces, and shallow
or very deep layers of clutter in the soil.
The Start and Stop Gates are adjusted
independently.
The Start Gate has a range from 0 to –100
with a default setting of 0.
The Start Gate can be set to suppress detections
from targets and clutter that appears above the
Start Gate Marker. This reduces false alarms due to
rough or uneven ground, or clutter layers near the
surface, such as grass or layers of leaf matter. The
grey GPR imagery will still be displayed, but audio,
LED and vibration responses and red overlay
highlights will be suppressed for targets or clutter
above the Start Gate marker. Note that this setting
will also suppress detection responses from flush
or shallow buried targets, and should only be
used when necessary.
The Stop Gate has a range from –100 to 0,
with a default setting of –100.
The Stop Gate can be set to suppress detections
from targets and clutter that appear below the
Stop Gate marker. This may be useful to suppress
responses from deep clutter layers. The Grey GPR
imagery will still be displayed, but audio, LED
and vibration feedback, and red display overlay
markings will be suppressed below the Stop Gate
marker.
40 | GPR Overview
Setting the Start/Stop Gates
1. Ensure that the GPR Sensor is enabled, then
long‑press the Skyshot button.
The Skyshot button
The Start Gate icon and numerical value will
be displayed. Markers will flash on the left
and right of the LCD, indicating which Gate is
currently being adjusted.
2. Use the Plus (+) and Minus (–) buttons to
increase or decrease the Gate position. The
markers will move correspondingly.
Repeat as necessary while sweeping the
Sensor Head over the type of ground to be
searched until false alarms no longer occur.
3. Short‑press the Skyshot button to proceed to
the Stop Gate adjustment.
4. Repeat step 2 to adjust the Stop Gate.
The Gate positions cannot be overlapped, so
a value lower than the Start Gate value must
be selected.
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