GSSI SIR 30, Manual

Page: 73 / 150

Geophysical Survey Systems, Inc. SIR® 30
Manual
MN 93-101 Rev E 67
Data Collection Setup – Road Survey with Horn Antennas
In this section, we present a systematic description of the data collection setup of the SIR 30 with a horn
antenna. The setup details data collection configuration in distance mode with a GPS. In addition to the
GPR system, the User will need a 4 x 4 ft (1.2 x 1.2 M) flat metal plate. The plate should be smooth and
clean. It can be of any composed of any metal and may be any thickness. GSSI recommends using a thin,
aluminum plate of 4’ x 4’ dimensions.
This setup description may be used with the Model 4108 1 GHz, 4105 2 GHz, and the 4105NR 2 GHz NR
antenna, or the 42000S 2 GHz antenna.
Note:
When mounting a horn antenna on the vehicle, insure that the bottom of the antenna is positioned at
least 18” (50 cm) from the ground surface.
Step 1: System Settings
1
After the User has selected the desired linear units from the system start screen, the SIR 30 will display
the System Settings menu shown in Figure 83 below. In this menu, the User will specify scan
parameters such as horizontal scan density (SCANS/UNIT) the Units per Mark, the antenna transmit
rate and X, Y GPS offsets.
Figure 101: System Settings.
2
Distance Control:
The User should enter the desired horizontal scan density and mark spacing.
3
Unit/Mark:
The User should enter the desired units per mark. This controls the spacing of distance
marks written into the data file and onto the data acquisition screen during data collection.
4
Max Units/File:
This is the total expected length of the data file in distance units. If the User knows
what the file length in distance units will be prior to data collection then enter the value here, otherwise
leave this value at zero (0). If no value is entered, the system will reserve a memory space of 5 GB per
channel by default. The Sir30 Calc utility should be used to determine the maximum unit s per file.