SL 30/35 Hull Sonar Operators Manual
974-25007001/2.0
Menu and Software Description
Page 4.47
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
4.59.2.1 Sector
View
The sector view allows you to select Up, Down, Left, and Right as the orientation of
the sonar image display. Generally, you should choose the view that seems to
match the orientation of the sonar head. If you are looking ahead, choose Sector
Up. If you are looking down as when profiling, you will probably want to choose
Sector Down.
4.59.2.2 Display
Gain
The display Gain should normally be set to 100 percent. It should only be used in
playback to adjust the recorded signal levels if required. If you set this control to
less than 100 percent while using a sonar head as the data source, the system may
not operate at maximum speed. It is recommended to use the head gain (on the
Control panel as well as the Image Control Bar) during active sonar head operation.
4.59.2.3
Rx Gain Type
The Rx gain type is used to enable elementary image processing for reverberation
control (RCG), automatic gain control (AGC) or a combination of the two. The Rx
Gain Response is the severity of the gain control. Note that these operations are
computationally expensive and may compromise system performance. The
algorithm for the AGC adjusts the gain applied to each sample of a ping to maintain
some nominal signal level. The leading edge of targets are therefore most visible
with the trailing edges fading away. The Reverberation control uses the average
signal level through a number of ping and uses that as a reference to adjust the gain
to maintain some overall background signal. This has the effect of increased gain in
low noise environment and small gain for highly noisy environment.
4.59.2.4 Scan
marker
The scan market is used to enable or disable the marker on the sonar image
showing the current angle of the transducer.
4.59.2.5 Grid
control
The grid control selects the type of grid (Polar or Rectangular) as well as enabling
and disabling it.
4.59.2.6 Timer
The timer is used to display elapsed time in the sonar window. The primary use of
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