Kongsberg Simrad ES80, Руководство по установке, Страница: 55 / 312

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Acoustic noise
As with any other hydroacoustic systems, the quality of the ES80 echo data and presentations
are subject to unwanted acoustic noise. The echoes from any large and small target must be
detected inside the noise.
It is important that we keep the noise level as low as possible. This is necessary to obtain
long range and dependable interpretations of the echoes. Even with the advanced noise
filtering offered by the ES80, we must address the noise challenge. This is important during
the planning and preparations for the ES80 installation.
Topics
Contributing factors, page 53
Self noise, page 55
Ambient noise, page 58
Fishing gear noise, page 58
Electrical self noise, page 59
Some means to reduce acoustic noise, page 59
Contributing factors
Several factors are contributing to the performance of the hydroacoustic equipment used
on board a vessel.
Factors contributing to the performance of the hydroacoustic equipment used on board a
vessel are:
• The quality and properties of the transmitted signal
• The quality of the receiving system
• The operational settings made during operation
• The properties of the target(s)
• The signal-to-noise ratio
The majority of these factors can neither be controlled nor improved by means of installation
methods or transducer locations. The quality and properties of the transmitting and receiving
systems are key factors during our product development, while our end user documentation
aims to help the user to make the right filter settings during operation. As for the target
properties, there is nothing any of us can do with those.
The signal-to-noise ratio , however, can be improved by making the correct choices during
installation.
Preparations