Operation Manual

System description
9
850-164385 / Rev.C
Stabilization system
When the beam stabilizer is activated, both horizontal and
vertical beams will be stabilized electronically for roll and pitch
movements up to 20 degrees. The beam direction will then
change continuously according to the vessel’s movements, and
secure an optimal contact with the targets even in rough seas.
Stabilization
system
Reception
A great effort has been made to reduce unwanted noise to get a
clean and stable echo presentation. To achieve this goal the
sonar receiver has the following filtering possibilities:
FM Correlation filter
In addition to the traditional single frequency transmitting
method, the SH80 sonar is equipped with an FM correlation
mode.
In FM mode each transmission pulse contains up to four
different frequencies, and the receiver makes a spectrum
analysis and compares the received echoes with the transmitted
frequency code. This provides a filtering effect, which
efficiently reduces interference, noise and reverberation. In
addition to giving a clean and stable echo presentation, this will
normally also increases the sonar’s detection range
Frequency selection (Option)
The optional multiple frequency selection can be used for
suppression of interference from other sonars.