"The Right Way"
Pass System Receiver"
"One-pass" system is a highly accurate
pipeline detection method used to determine
both the horizontal and vertical coordinates
of a pipeline or cable. The pipeline or cable
is electromagnetically energized with a low
frequency AC current at cathodic protection
test leads points on each side of the pipeline
crossing. A receiver is calibrated at known pipe depths
(probed) near the river banks.
The receiver is mated with the on
board computer running ARiver software to
automatically capture pipeline depth
down to 40 meters (130 ft), water depth,
together with RTK GPS in each pass
over the pipeline. At specified intervals, the
pipe readings, water depth and RTK GPS
readings are automatically stored
into the "One-Pass" memory system allowing a
contour survey of the river bed above and
in the areas surrounding the pipeline.
The ARiver software gathers the necessary
field data, compiles the results of the data
and translates into a DXF format
made available in a variety of popular