10.4.3 User Manual Contents April 17, 2020
Firmware: 5.2.1 Page 52 of 142
This option controls how the surface sound speed is applied. If Auto Sound Speed is
selected (recommended) the sonar only takes in values from the sensor installed at the
sonar head. If this sound speed probe fails, users can disable the auto option and
manually input the speed, based on a sound speed profiler for example. An incorrect
surface sound speed will irreparably compromise the beam pointing direction resulting
in bad data. Minimum value is 1300m/s, maximum is 1700m/s. When Auto Sound
Speed is deselected, the last value at the head is used to populate the SV value. Please
note that this range reflects default hardware capabilities. For marine conditions
requiring a larger range, other models of the sound speed probe are available; please
contact NORBIT for more information.
If this option is selected the speed of sound is read from the probe at the sonar head.
This is recommended unless the probe is damaged, out of calibration or there are too
many bubbles affecting the data quality, e.g. when surveying in rapids or surf-zone. If
necessary, this option may be deselected, and the value set manually. If the sonar is
powered on and out of the water, or there are excessive bubbles, the GUI displays a
warning that the sonar is “Out of water”. If the sonar is pinging out of water, it
automatically takes measures to prevent damage due to overheating. If the sonar
temperature exceeds 65°C it will shut down automatically as a safety precaution.
Roll stabilization allows for a wider swath width in more dynamic sea states. Roll
stabilization compensates up to ±10º of roll and is limited to 160º swath angle. Note that
roll stabilization is unrelated to roll compensation for georeferencing purposes, which is
handled separately.
Pitch
Stabilization
(STX only)
When activated, pitch stabilization allows for pitch compensated transmit beams for a
more even along-track coverage with minimal loss. STX scanning must be
deactivated prior to use.
Sets the pulse amplitude (transmission power). For shallow waters (<10m) in highly
reflective areas (lock chamber, for example) it may be necessary to reduce the pulse
amplitude to reduce acoustic reflections/noise in the survey area. Otherwise it is best
to leave it set to 15.
There are 4 modes to select from:
• Equiangular 512 or 256: The angular swath coverage is divided equally by
512 or 256 (the total number of beams) to determine angular beam spacing.
Use to increase resolution around the nadir zone.
• Equidistant 512 or 256: The maximum chord distance of the swath is divided
by 512 or 256 to determine the linear beam spacing. Use to increase resolution
at outer swath edges. There is a short 1 second lag when switching modes.
Do not switch while logging data.
Specifies the tilting angle in special mounting configurations such as dual head when
the sonar is mounted at an angle. Allows the user to normalize the display in the GUI,
otherwise a flat seafloor will appear as a slope. Note, additional considerations are
required when the integrated IMU is tilted; refer to technical note TN-190018 for details.
As of GUI release 10.4, users can collect up to 3 detections per beam: one extra
detection above and below the bottom detection. The upper and lower gates control
which part of the water column is considered for extra detections. The Adaptive Gates
control how close the extra detection will be to the bottom detection: if set to Wide or
Off, the extra detections could be further away from the bottom detection, and if set to
Narrow, the extra detection will be closer to the bottom detection.
Adjusting the slider increases or decreases the sensitivity of the multi-detection
algorithm to qualify the water column as a potential extra detection.
Multidetect in
S7k Output
The user can select whether to output an extra detection above (Upper) and/or below
(Lower) the bottom detection in s7k files generated by the GUI.
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