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System Configuration
System requirements:
•
Latest version of sensor (v3): M3/M4/M5/
M6 receiver version 04.02.28 or
version 01.02.05 or later
•
Earlier version of sensor (V2):
receiver version 03.01.23 or later, any Scala
version
Trawl Explorer sensor is added to your
receiver configuration with Marport Scala
software.
When configuring in Scala:
•
Make sure that the uplink frequencies in your
sensor configuration (Mosa) and receiver
configuration (Scala) are identical.
•
Trawl Explorer sensor uses an 400Hz frequency
bandwidth. When adding other sensors to the
system, make sure there is enough distance
between their uplink frequency (200 Hz
margin above and below used frequency). If
not, there will be signal interferences.
For further information, refer to Trawl Explorer
user manual.
Display
Sensor data such as echogram, depth, temperature,
pitch and roll are displayed on Scala software.
You can customize their display types:
•
Text
•
History Plot
•
Dial
•
Gauge
Trawl Explorer has different features that enable
you to better see in the sea. These features depend
on your sensor version.
Target Strength
(V3) Target strength of individual
targets is displayed on the echogram when you
hover over it with your mouse. It helps you to
identify fish.
TVG
Signals sent by the sensor are attenuated in the
water. It means the deeper the target is, the more
attenuated signals will be received and sent back.
TVG (time variable gain) is here to compensate this
effect by using a lower gain level when signals travel
toward a target at a small distance and higher gain
level when signals travel toward deeper targets. The
end result is to compensate sounding attenuation
and therefore to show a same target strength for a
same target at different depths.
You can set TVG at 20 log (better target strength
of bottom, schools of fish), 40 log (better target
strength of individual targets) or 30 log (compromise
between the 2 others).
Trawl Explorer Quick Reference Guide
Autorange
adapt automatically to the bottom detected. This
way, you have better echogram image quality when
the trawl opening is small, because the range will
later,
Scala
become smaller (the smaller the range, the better
the image quality will be). You can use this mode
M3/M4/M5/M6
only with Down only mode and with a trawl opening
less than 20 m.
Below are examples of echograms from Trawl
Explorers.
(V2, V3) The range of the sounding can
TE_qrg / Rev1
3
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