Kongsberg Simrad SN90, Installation Manual

Page: 17 / 298

381298/C
15
The following views are available.
•
Horizontal view
The Horizontal view shows your the area covered by the SN90 "from above". The
entire sector (90, 120 or 160°) is shown. The view also displays the current tilt as
well as numerical information.
•
Vertical view
The Vertical view shows you the "vertical slice" of the echo data. The slice covers a
vertical area from 0 to -90° relative to the physical installation angle of the transducer.
You can train the slice within the currently selected swath width (90, 120 or 160°).
Numerical information in the view shows you the current range and depth of the
cursor position.
•
Inspection beam view
The SN90 offers three inspection beams;
Centre
,
Starboard
and
Port
. Each inspection
beam has an opening angle of 5x5°, and allows you to investigate certain targets in
more detail. The information from the inspection beams are presented in their own
views.
The tilt of the Centre inspection beam follows the tilt you have selected in the
Horizontal view. You can train this beam within the currently selected swath width
(90, 120 or 160°) using the
Train
buttons on the operating panel.
Once the relevant view is "active", the Starboard and Port inspection beams are
controlled individually using the
Train
and
Tilt
buttons on the operating panel. You can
also use the
Bearing
and
Tilt
functions on the
Main
menu.
You can change the physical size any view by clicking on the view border, and then drag
it to create a larger rectangle. Note that the size of the other views will be reduced
accordingly!
Specifications and functionality
The Simrad SN90 is a unique sonar, both in design and functionality. The composite
transducer and the transceiver each uses 256 individual channels for transmission and
reception. A large frequency bandwidth is supported, as the SN90 allows you to choose
a 0.1 to 40 kHz bandwidth with centre frequency from 70 to 120 kHz in steps of 1
kHz. The bandwidth can be set up individually for each sonar view. The beams have a
horizontal coverage area of maximum 160°, and the vertical beam width is typically 6°.
The beams can be tilted from +10 to -90° in 1° steps. In addition to this, three adjustable
split-beam inspection beams of typically 5x5° can be used for a more detailed study of a
school of fish, such as observing fish behavior, target strength and biomass. The absence
of a hull unit allows for easier and less space demanding installation, and the transducer
is either mounted flush with the hull plating, or in a streamlined blister. The transducer
installation removes the chance to get tangled up or damaged by wires, and greatly
reduces the risk of being damaged by objects in the water.
Great emphasis has been placed on giving the best possible sonar presentations on a
high resolution colour display. The SN90 is equipped with Simrad’s celebrated signal
processing software. It includes Hyperbolic FM transmissions (also know as "Chirp") to
SN90