GSSI SIR 30, Manual

Page: 78 / 150

Geophysical Survey Systems, Inc. SIR® 30
Manual
MN 93-101 Rev E 72
c)
Select RADAR CONFIG > MAINTENANCE > CONFIGURE GPS. This will open the GPS
configuration menu. The values displayed are the SIR 30 default values.
Figure 108: GPS Configuration.
d)
Securely attach your GPS antenna to the survey vehicle or the GPR antenna. The amber status
light on the front panel of the SIR 30 will begin to blink when it detects an incoming GPS
message.
e)
Measure the in-line X (front-back) and cross-line Y (left-right) offset from the center of the GPR
antenna connected to Channel 1. These offset values must be entered in the Antenna Entries
section of the System Settings menu. These values will be used in RADAN 7 to correct for
GPS\GPR antenna offsets.
f)
Configure the GPS output COM port parameters to match those of the SIR 30. The User should
consult their GPS manual for the COM port configuration instructions. The SIR 30 default values
are show in Figure 90 above. The amber LED next to “GPS” will be lit and flash if the SIR 30
detects incoming GPS data.
g)
Select CUSTOM MARKS and enter in a Mark Name for custom data markers as desired. Theses
marks may be used to denote the location along the scan of different survey conditions, physical
features, or events during the survey. The User may select a Custom Mark Key and enter a name
for the mark corresponding to one of the keyboard function keys, F1 – F10. Click ACCEPT to
save these values. This information will be stored in the data file’s marker table.
Step 3: Data Acquisition Settings
As the SIR 30 stores only raw data, all data acquisition settings are for display purposes only. The
acquisition parameters will be stored as a separate file along with the RADAN *.DZT file that will be used
by RADAN 7.
1
Select RADAR CONFIG > SCAN > TIME RANGE. . If the User has selected an antenna type from
the Systems Setting Menu, the SIR 30 will load a default range for that antenna. In some cases, this
range may not be ideal for the specific application at hand and will have to be adjusted by the User. If
the event the User changes the range, the User may also have to make changes to the Samples per Scan
and Filter settings
2
Select RADAR CONFIG > SIGNAL PROCESS > IIR FILTERS.
3
The SIR 30 User should adjust the filter settings and change them as conditions require. The default
Low Pass filter setting is 2 to 2.5 times the center frequency of the antenna and the default High Pass
filter setting is ¼ to 1/3 the center frequency of the antenna. GSSI recommends leaving these at the
default values.