Geophysical Survey Systems, Inc.
SIR® 4000
Manual
MN72-433 Rev F
129
Chapter 9: Using a GPS with your SIR 4000
Your SIR 4000 can assign GPS coordinates to individual data profiles. This will allow you to place your
survey lines into a larger, real-world coordinate system provided that you have a GPS with sufficient
accuracy for your application. RADAN will then be able to show coordinates with a GPR X, Y, and Z.
Technical Notes are available on the GSSI Technical Support website at
http://support.geophysical.com
. These Notes contain specific GPS integration information.
The GPS you do choose must have the following:
1.
Data output through a serial (RS232) port.
2.
Output data at a baud rate ranging from 4800 to 230400.
3.
Output the NMEA GGA data string.
East vs. West.
The SIR 4000 is set to capture Latitude and Longitude coordinates rather than UTM. It
does not however tag a North/South or East/West to those numbers. If you are west of the Prime
Meridian, the Longitude will be negative and if you are south of the Equator, the Latitude will be
negative.
9.1: Connecting a GPS
1
Turn on your GPS to determine if you are getting a good position and an adequate number of
satellites.
2
Power up your SIR 4000 and connect the GPS to the serial port on the control unit.
3
From the Introduction Screen select GPS from the Toolbar and check the following settings.
•
GPS Type:
Select Custom as the GPS Type.
•
Baud Rate:
Choose a Baud Rate that matches the one set on the GPS unit.
•
Start:
Press the green Start button on the right side of the control unit.
•
Format:
Choose a format for viewing the data during collection and playback.
Once a GPS connection is verified Apply the settings.
4
When you start collecting a file, the SIR 4000 will capture a GPS coordinate and place it in the file
header. It will do the same every three (3) seconds as long as you are collecting data and the HDOP
(Horizontal Dilution of Precision) is two (2) or less. These coordinates will be visible in the Tables
Pane in RADAN 7 software.
9.2: Understanding GPS
This section gives a quick GPS overview and then describes what you need to know in order to
effectively use a GPS with the SIR 4000. GPS information is attached to the data as a *.DZG file.
RADAN 7 incorporates GPS information automatically when the *.DZT file is opened.
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