ImpulseRadar PinPointR User Manual V1.5
Page 16 (36)
Description of GPR unit settings:
•
Trig Source
–
defines how data collection is
controlled. By default, this will be
‘
wheel
’
using
the direct-drive wheel encoder. Make alternative
selections from the wheel option menu. Time or
Manual triggering is also available. In Manual
mode, you must tap the on-screen trig button for
every A-scan.
•
Distance Interval
–
defines the distance between
every A-scan
1
, when Trig Source is set to wheel, or
Manual (sometimes also called point distance).
•
Time Interval
–
defines the time between every A-
scan
1
when Trig source is set to time.
•
Soil Velocity
–
defines the velocity used to
calculate the depth scale.
•
Number of Samples
–
defines the time window or
maximum penetration depth, and the adjacent
Max Depth for the two channels is calculated
based on the Soil Velocity.
•
Data Mode
–
defines how many bits are used
while storing the resulting radar data. The default is 16-bits, and this is also what we recommend.
32-bits can be selected, but it is only for unique occasions that it is useful to save data in 32-bit
format. The precise number of useful bits depends on the point distance, survey speed, and GPR
unit centre frequency. Note that using 32-bits during surveys requiring high speed only increases
the risk of dropping data in Ethernet-link, use 16-bits and not unnecessary long time-windows to
reduce the load on data transmission in these cases.
•
GPS
–
defines whether to use the internal module
or an externally connected system. If External is
selected, you must adjust for the correct baud-rate, which can be obtained from the user manual
for the GPS system used. EXT + TP is intended for use with an external while gathering precise time-
stamping on each A-scan with the help of the internal GPS. If no external GPS is present, when this
option is selected, a time-sync file will still be created. See also later paragraph on GPS-symbols.
•
Wheels
–
defines the type of wheel connected to the system for distance measurement. The
standard wheel is the Direct Drive Cart. PinPointR users that have the older Belt Drive Cart need to
select that type of wheel encoder manually.
•
Antenna info
–
Hardware type and menu trough which upgrade of FPGA / firmware may be done,
see later paragraph.
•
Restore factory settings
–
If internal settings have been corrupted or after a firmware upgrade, it
’
s
advisable to restore to factory settings, all essential system parameters will be reset to the initial
state.
Note:
The wheel type will be Direct Drive Cart as default. If a Belt Drive push-cart is used, this needs to
be changed manually by the operator.
Figure 14
Settings parameters
