Kongsberg Simrad ST90, Reference Manual, Page: 392 / 690

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Dead Reckoning
The
Dead Reckoning
function is used to improve the position of the track line relative
to the actual position of the drifting fishing gear. For this function to operate, the ST90
system requires input from a speed log.
Stabilization
The ST90 system is provided with a built-in motion sensor to provide electronic
stabilization of the sonar beams. If the sensor is malfunctioning the input can be
disabled.
Screen Captures
While using the ST90 system you may wish to make a screen capture to save an
instantaneous copy of the current presentation. You can choose either a single screen
capture or a sequence with multiple screen captures.
Beam Visualization
With the various beams provided by the ST90 system, it may be difficult to understand
the concepts. How do these beams "behave" in the water? The beam visualization
feature simulates how the acoustic beams cover the seabed and the water column.
Diagnostics
The ST90 system is a computerized sonar. There are hardly any analogue circuitry,
and the possibility of traditional troubleshooting is limited. In order to rectify this, a
built-in software application is available to offer test and maintenance functionality.
The
Diagnostics
dialog box controls the test and diagnose application that checks the
performance of the ST90 system.
This dialog box contains a number of pages selected from the menu on the left side.
The following pages are provided:
Processor
The
Processor
page offers an overview of the parameters related to software
version, operation and network.
Sensors
The
Sensors
page presents a table with all the sensors currently connected to the
ST90 system. For each sensor, the status is provided.
Transceiver
The
Transceiver
page offers key information about each transceiver board in
the Transceiver Unit.
The purpose of the transceiver boards is to first create and transmit the acoustic
pulses. After the transmission the transceiver boards receive the echoes from
the seabed and/or the water column. These echoes are filtered, amplified and
Simrad ST90 Reference Manual