5.3
STX (Steerable Transmitter) Usage
The NORBIT STX is a steerable projector system that allows the transmit beam to be directed
forward 10° and aft 10°, in a scanning pattern, along the vessel track. This scanning allows the
system to ensonify areas that otherwise would not be, such as behind pilings. This functionality aids
inspection surveys by giving a more complete picture of the survey area or target.
When scanning is activated, the STX begins steering the transmit beam. Each step-in angle occurs
with each ping. The time to complete a full fore/aft scan depends on the current ping rate, for
example a ping rate of 20Hz, and a step size of 20, means 1 second per scan. For this reason, it is
not recommended, for most applications, to have a step size of more than 20. For best results it is
advised that the speed be kept as slow as is safely possible. In addition, it is recommended that two
passes be performed: one pass as close as is safely possible to the structure, and a second pass
slightly further away. This ensures that maximum coverage is achieved.
The STX can also be used to capture additional details on complex structures on the seafloor, such
as shipwrecks. Steering the transmit beam allows multiple hits, at various angles, on the target
during a single pass.
NOTE: Larger STX step sizes
For most applications it is recommended to not exceed a step size of 20. In
special cases, the step size can be increased up to 120. Contact NOTBIT
support for further information and guidance.
To Next Page
Loading...
