User's Manual

GPR4 Utility Scanner

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User Manual

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Earth Science Systems, LLC

October

2019

Page 21 of 27

7 Appendix

7.1 Digitizer Settings

The default settings for the digitizer are sufficient for nearly all surveys. Advanced users

may choose to change these settings (see Figure A1). To view or change the digitizer settings,

select (File, Settings).

1. Trace Sample Rate Select the desired number of traces per second. Using fewer traces

per second gives a higher signal to noise ratio and increased depth of investigation.

However fewer traces per second will result in fewer traces per foot (meter) at a given

traverse speed.

2. Sample Rate Select the sample rate used for each A-scan. Normally a sample rate of 8

GHz is used for antennas with center frequencies less than 1 GHz, and 16 GHz is used

for antennas with center frequencies greater than 1 GHz.

3. Num Samples Select the number of samples for each A-scan. A value of 512 samples

will work for most situations. Note that using a large number of samples (1024 or more)

may limit the Trace Sample Rate.

4. Channel A/B Holdoff The GPR digitizer has two channels: A and B. The holdoff time

can be adjusted independently for each channel. The B channel can only be adjusted in

4 ns increments relative to the A channel. Normally, users will not need to change these

values.

7.2 Software Installation

If the tablet computer has not yet been setup for use with the Utility Scanner, proceed as

follows. The thumb drive that was distributed with the system will be needed.

1. The tablet computer must use the Windows 10 operating system. The following tablet

computers are approved.

a. Microsoft Surface Pro 4

b. Microsoft Surface Pro 6

Figure A1. Digitizer settings dialog.