Performance specifications
These performance specifications summarize the main functional and operational characteristics of the SN90 system.
Operating frequency
Frequency range:
•  Start frequency70 kHz
•  End frequency120 kHz
•  Frequency steps1 kHz
These values are only valid for SN90 systems using the LPT32 transceiver board. For systems using the TRB32 transceiver board, the values are:
•  Start frequency: 75 kHz
•  End frequency: 95 kHz
•  Frequency steps: 1 kHz
To find out which transceiver boards your transceiver is fitted with, see the Transceiver page in the Diagnostics dialog box.
Operational range
•  Minimum25 metres
•  Maximum2000 metres
Even though you can choose a large range value, that does not mean that you can detect your targets on the same range. The range value only defines the range that is shown in the views. Actual target detection will always depend on the operational environment, such as water temperature, salinity, interference and layers in the water column.
Tilt function
•  Horizontal views–80 to +80 degrees
•  Vertical views-40 to +40 degrees
•  Inspection view: –80 to +80 degrees
Note
The tilt limits depend on the opening angle of the vertical beam. This means that you may not always be permitted to select the maximum specified tilt limits.
Transmission
•  Number of transmitter channels256
•  Horizontal TX Sector:
Maximum Other options
Horizontal swath 160 degrees 90, 120 degrees
Vertical swath Normal Narrow
Plane swath 160 degrees 90, 120 degrees
Inspection beams SLL -13, -17, -22, -23, -26, -30, -35 dB
•  Vertical TX Sector:
Maximum Other options
Horizontal swath Wide NarrowNormalAuto
Vertical swath 120 degrees 60, 80 degrees
Plane swath Wide NarrowNormalAuto
Inspection beams -
The options provided by these functions depend on your current active view.
Pulse types
•  CW (Continuous Wave)
•  LFM (Linear Frequency Modulation) (This pulse type is also known as "chirp".)
•  HFM (Hyperbolic Frequency Modulation)
•  Auto
These values are only valid for SN90 systems using the LPT32 transceiver board. For systems using the TRB32 transceiver board, the values are:
•  CW (Continuous Wave)
•  LFM (Linear Frequency Modulation) (This pulse type is also known as "chirp".)
•  Auto
To find out which transceiver boards your transceiver is fitted with, see the Transceiver page in the Diagnostics dialog box.
Reception
•  Number of receiver channels256
•  Gain functions:
–  TVG (Time Variable Gain)
–  AGC (Automatic Gain Control)
–  RCG (Reverberation Controlled Gain)
•  Digital filters:
–  Ping-Ping Filter
–  Noise Filter
–  FM Correlation filter
–  Target Threshold
Echo presentations
•  Display resolution: 1280 x 1024 pixels (Minimum). The visual quality of the presentation depends on the quality of your graphic adapter and display. We recommend that you use a large display with resolution 1920 x 1080.
•  Colours: A selection of echo colours is available to fit your presentation preferences. Each selection represents a dedicated colour scale.
•  Palettes: A choice of colour palettes is available to fit ambient light conditions.
Stabilization
•  Roll stabilisation: ±20 degrees (Automatic)
•  Pitch stabilisation: ±20 degrees (Automatic)
•  External stabilisation sensor: The SN90 system has been designed to match the motion reference unit (MRU) sensors manufactured by our Seatex division. Interface to an optional peripheral motion reference unit (MRU) is supported.
Interfaces
•  Interfaces to peripheral devices:
–  Serial lines
–  Ethernet (LAN) line
•  Optional interfaces:
–  Scientific output (NetCDF)
Note
NetCDF output requires a dedicated software license.
User interface
•  Main control: The Operating Panel offers all necessary control functions for normal operation.
•  Secondary control: A comprehensive menu system allows access to all SN90 system functionality.
•  Optional control:
–  You can use a standard computer mouse to control the SN90 system.
–  You can use a Microsoft Xbox Controller to make basic adjustments to the sonar operation.
•  Menu languages: The text in the menu buttons in the user interface can be provided in several different languages. With a few exceptions, the chosen language is also used for all other texts.
Hull Unit
The SN90 system can be provided with one of the following hull units:
Hull Unit Lowering depth (m) Transducer cables (m) Maximum speed (knots)
SN92H 1.2  13 16 
SN92HPX 1.2 13 14
SN93H 1.6 13 14
SN93HPX 1.6 13 12
SN92HPX, SN93HPX: Two trawl hydrophones are added for use with a catch monitoring system. Both hydrophones point aft.
Installation trunk
The installation trunk is not included in the standard delivery. The installation trunk may be fabricated by the shipyard, or supplied by us as an option.
Type approvalDnV Certificate S-6344
Transducer
The same transducer is used on all hull unit types.
•  ShapeRectangular
•  Number of individual elements256
•  SN92HPX, SN93HPX:
–  The transducer housing provided for the hull unit can be fitted with two hydrophones.A hydrophone is a vital part of a catch monitoring system.The hydrophone receives the acoustic communications from the catch sensors and converts these to electrical signals.Both hydrophones point aft.The hydrophones are connected to a catch monitoring receiver.