This sub-menu has four main choices: Antenna, T_RATE, MODE, and GPS.
Under this menu, you will be able to enter the center frequency of the particular
antenna you are using. This will allow the SIR 3000 to perform the auto-surface operation.
The T_RATE is the antenna transmit rate in KHz. This rate is capped at 100 KHz. A higher
transmit rate equals faster data collection ability. Some older antennas however, are not capable of
transmitting at high speeds and setting them at a high transmit rate may cause error. Please consult your
antenna documentation or call GSSI Tech Support if you have any question about transmit rate. All GSSI
5100 and 52000 series antennas (2.6 GHz, 2.0 GHz Palm, 1.6 GHz, 1.5 GHz, 1.0 GHz, 400 MHz, 270
MHz, 200 MHz) can be driven at 100 KHz. If you are using another GSSI antenna, consult Appendix E
for the proper transmit rate.
If your SIR 3000 beeps repeatedly with an older/high power antenna, you may have your T_RATE
set too high. This beeping is a high-voltage overload warning. A prolonged overload could damage your
system. Lower your T_RATE until the beeping stops.
The MODE selection allows you to collect data as point, distance, or time based. Point data
collection is commonly selected only for very deep applications or very difficult terrain. The system will
record one scan every time the external marker or Run/Stop button is pressed. The antenna is then moved
to the next location and the next scan is taken. In time based data collection, the system is recording a
certain amount of scans per second. The data density over an area depends on the speed that the antenna is
moved over the ground. The rate (scans/second) is set in the SCAN submenu. Distance-based collection is
performed with a survey wheel. The system records a certain number of scans per unit of distance. This is
the most accurate data collection method and it is strongly recommended that you collect data in this
mode if possible. Distance-based data is required for 3D files
This selection allows you to toggle the GPS capability on and off. Connect the GPS to the serial
port, and toggle this either to G30L if you are using the GPS receiver obtained from GSSI, or to
CUSTOM if you are using another GPS receiver.
If you are using the Acumen SDR Data Bridge/Logger purchased from GSSI, attach the serial lead from
the GPS to the Data port and attach the lead from the SIR 3000 to the Config port, and then select SDR
from the list under RADAR > GPS.
Consult Chapter 7 of this manual for additional instructions and setting up the GPS and working with it.
GSSI publishes information about GPS integration as Technical Notes that are available on the GSSI
Technical Support website at
.
Scan contains six additional menus: SAMPLES, FORMAT, RANGE, DIEL, RATE, and SCN/UNIT.
Each scan curve is made up of a set number of individual data points, called Samples. The
more samples you collect, the smoother the scan curve and the better your vertical resolution will be.
You can choose from a preset list of 256, 512, 1024, 2048, 4096, or 8192 samples per scan. FIR
filters should not be used with 4096 or 8192 samples per scan.
Note that as sample number increases, maximum scan rate drops and file size increases.
GSSI recommends sampling at 512 or 1024 samples per scan for most applications. More
samples will be required for deep geologic or polar ice thickness applications.