GSSI SIR 30, Manual

Page: 34 / 150

Geophysical Survey Systems, Inc. SIR® 30
Manual
MN 93-101 Rev E 28
Figure 39: Radar Config.
RADAR CONFIG > RADAR > Run Mode
This option allows the User to control the data acquisition mode. The User may select Time, Distance, or
Point mode. The data collection mode will be indicated in the top left corner of the display next to the
current file name.
Time Mode:
In the Time mode, data acquisition speed is a function of time and is expressed as a specific
number of scans per second. The Time mode is used if data is collected without a survey wheel or distance
measuring instrument (DMI). In the Time mode, the SIR 30 will collect data at the scan rate listed in the
Scans/Sec option in the RADAR Config/RADAR sub-menu. In the Time mode, the horizontal scan density
is a function of the scan rate (Scans per Second) and the speed at which the antenna moves over the
ground.
Figure 40: Run Mode Time.
Distance Mode:
In the Distance mode the User can collect data at a specific scan density (entered in the
Scans/Unit option in the Systems Settings display (See Figure 20). In the Distance mode, the User has
complete control of the horizontal scan density and horizontal resolution. The advantage of collecting data
in the Distance mode is that the horizontal scale of the GPR record will be linear. Data processing methods
such as migration require a linear horizontal scale to achieve accurate results.