User's Manual

pulseEKKO PRO 6-Surveying Techniques
85
6.1.5 Antenna Movement
If practical, antennas should not move while data are being collected, as indicated by the duration of the
beeping tone. Keeping the antennas static assures the highest quality stacked data. When the beep
stops, the antennas can be moved to their next position in preparation for the next trace. Obviously,
holding antennas stationary is impractical if a continuously moving platform is used for data acquisition
(Figure 6-5).
6.2 High Frequency Reflection (Profiling) Mode
6.2.1 Tow Mode Operation
One method of data acquisition in smooth terrain is the tow mode configuration shown below (Figure 6-1).
The operator carries the DVL and Control Module (or uses a DVL Carrier) and has a belt battery fastened
around their waist to power the system.
Data collection is usually controlled by the Big Wheel odometer, as shown below.
It is also possible to remove the odometer and control data acquisition using the electrical beeper/trigger or
the DVL button (Section 3.3.1.1: P43).
A third option is to run the system in free Run mode (Section 3.3.1.3: P43) with a time delay between
traces (Section 3.3.3: P44).
Figure 6-5: High frequency tow mode operation. As the operator drags the transducers across the surface, the odometer triggers
data collection at equally-spaced intervals (called the Step Size). The data being collected are visible in real time on the DVL
screen.