User's Manual

6-Surveying Techniques pulseEKKO PRO
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6.6 Odometer Data Acquisition
Data acquisition can be controlled by an odometer triggering the radar system to collect data at specified
step sizes (Section 3.3.1.2: P43). There are several odometers available for the pulseEKKO PRO system
including the Big Wheel Odometer (See Figure 2-23 on page 17), SmartCart odometer (Figure 6-8) and
the vehicle odometer (contact Sensors & Software for more details).
Figure 6-8: The pulseEKKO PRO SmartCart has an odometer to trigger the system to collect data at an equal step size defined by
the user.
6.6.1 Skipping Traces
In odometer mode, it is possible to move too fast and trigger too quickly for the system to keep up.
If the odometer is being triggered too quickly, the DVL will write the total number of skipped traces on the
bottom of the screen. When this occurs, positional accuracy is retained but “skipped” traces will be filled in
the data file as a repeat of the last successfully collected trace. When traces are repeated, the data display
may appear “blocky” because two or more identical traces are being displayed. If more than 10 to 15% of
the data traces in a survey line have been skipped, the operator should consider surveying the line again
at a slower speed to reduce the number of skipped traces.