GSSI SIR 4000, Руководство пользователя

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Geophysical Survey Systems, Inc. SIR® 4000
Manual
MN72-433 Rev F 53
Step 2 – Expert Mode Setup
Once a new project is created you will see a split screen with the main data display window on the left,
the O-Scope window in the center, and the Setup menu on the right.
There are four (4) main menus in the Setup Menu: Radar, Process, Output, and System. To get started
collecting data you’ll need to check or adjust settings in all four (4) menus.
Recall Setup
If you’ve previously saved a setup you’d like to use, recall it first before making any changes. Otherwise
when you do recall the setup it will overwrite any of your changes with those that were saved. Setups can
either be uniquely named or you can use one of the sixteen (16) available setup names.
1
Open the System Menu and select Recall Setup.
2
Select your saved setup from the list using either the Control knob or arrow keys. Once the desired
setup is highlighted press either the Control knob or Enter button.
Radar Menu
1
Collect Mode:
Set to Time.
2
Dielectric/Soil Type:
Choose a Dielectric Constant or Soil Type that best represents your survey
area. For a list of Dielectric Constants see Appendix D: Dielectric Values for Common Materials.
3
Depth/Time Range:
There are two options for setting the depth or time range.
• Full Range:
With the system in Collect Setup mode and data scrolling across the screen, drag the
antenna over the area. As you do so watch the scan trace displayed in the O-Scope window.
When the scan trace gets to a depth/time where there is more noise, or interference, than signal
strength, you’ll see the scan trace jump from negative to positive and appear craggy. To setup the
system so that you’re collecting the maximum range of data possible you’ll want to see some of
that noise in the scan trace. If no noise is apparent then you should increase your depth or time
range until about 25% of the scan trace consists of noise. The noise to signal ratio will change as
you move across your survey area. So keeping some noise on the screen will help ensure that you
always collect the full range of quality signal.
• Target Specific:
With the system in Collect Setup mode and data scrolling across the screen,
drag the antenna over the area and find a target that you want to image. Note its position on the
screen and at what time/depth it occurs. Ideally, it should be halfway down the screen so that you
can image targets above and below it. If it is not properly located, change the depth or time range.
4
Scans/Second:
Your data density depends on the rate you move the antenna over the survey surface.
Typically this value is set much lower than the maximum.
5
Units/Mark:
You can also set how many units (feet or meters) will be collected between system
marks.
Note:
If you recall a setup after configuring the GPS, the SIR 4000 will recall a baud rate of
4800. If this does not match your previously selected Baud Rate, return to the Introduction Screen
and reset your Baud Rate in the GPS Configuration window.