18
3.5 Computer
The computer used for measurements are placed as convenient as possible for the operator carrying
out the measurements. The Ethernet cable is used to transfer the measured data from the control unit
to the computer for storage, display and processing. Fig. 3.9
Fig. 3.9
. Connection of the Ethernet cable between the antenna box (left) and the computer (right).
3.6 Positioning system
The used positioning system is initialised according to the equipments operating manual. Make sure
that the communication settings match the settings made in MIRASoft (see operating manual
MIRASoft).
Total Station
The total station needs to send out data in XYZ-format.
Place the Total Station so a good coverage of the investigation is reached.
Properly mark tie-in-points outside the investigation area (use the prism) (see operating
manual MIRASoft) and position these.
Note!
If the Total Station needs to be moved the same
tie-in-points needs to be seen from the new location.
Place the prism on the antenna array, in one of the spray mark holder (with the 5-8 UNC
thread, see Fig. 3.15). Preferably in line with the encoder wheel.
Connect the external radio link to the Total station and on the antenna array carrier. The radio-
link antenna is connected to the computer to gather the positioning data from the Total station.
Note!
In some areas the radio link needs to be elevated for best possible transferring. Although the
radio modems provided by MALÅ Geoscience is of high quality, with checksum handling and quite
high power ratings, they may be disturbed by ongoing radio traffic. In such case a different frequency
should be chosen, manuals for the modems are provided separately.
Examples of Total station and radio link arrangements are seen in Fig. 3.10.
.
Ethernet connections for
communication between the MIRA
option and computer.
The computer communicates
between the GPS or Total
Station on the serial COM-port
or by a USB to COM port
converter.
