GSSI SIR 30, Manual

Page: 66 / 150

Geophysical Survey Systems, Inc. SIR® 30
Manual
MN 93-101 Rev E 60
Figure 90: System Settings.
2
Distance Control:
The User should enter the desired horizontal scan density and mark spacing. In
Figure 90 (above), the option shown is 10 Scans per Meter, 10 Meters per mark.
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 will be prior to data collection, enter the value here. If the User leaves the value at
zero (0), the system will reserve a default file size of 5 GB per channel. The User can use the SIR 30
Calc utility to determine this value.
5
GPS:
When using a GPS during data collection, the User must select CUSTOM. The User must enter
the location of the GPS receiver with respect to the antenna connected to Channel 1. If the GPS
antenna is mounted to the GPR antenna, both the X and Y values will be 0. If the GPS is behind the
antenna, the X value will be the distance behind the antenna, and the number here will be negative.
The Y value determines how far to the right or left the GPS is relative to the antenna connected to
Channel 1. If you are standing behind the antenna, facing the direction of your survey profile, this
number is positive if the GPS antenna is to the left of the GPR antenna and negative if the GPS
antenna is to the right of the GPR antenna.
6
Antenna Entries Antenna 1 - 4:
The User should enter the details of the antenna(s) connected to
each channel input on the SIR 30. The ANTENNA 1, ANTENNA 2, ANTENNA 3 and ANTENNA 4
options correspond to the Channel 1-4 inputs on the back of the SIR 30. When using smart antennas,
data acquisition parameters will be set automatically. For each antenna, choose the Type (Center
Frequency), antenna model (some will only have one available), orientation (dipole polarity axis
relative to the transect direction), serial number and antenna offset location relative to the antenna
connected to Channel 1. The X and Y values will be 0, 0 for Antenna 1.
Note:
The serial number of the antenna must be entered if you are using a Model 4105NR 2 GHz
Horn, a 41000S 1 GHz horn or a 42000S 2 GHz horn. The serial number of the antenna is matched to a
Custom filter file stored in the SIR 30 or the laptop computer.