Kongsberg SBP 29, Installation Manual

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Acoustic and electric noise
To achieve SBP 29 data of the best quality, it important that the noise levels are as low
as possible. Noise will limit the systems capability to achieve high penetration, so it is
important to address the noise challenge during planning of the SBP 29 installation.
Topics
Contributing factors, page 26
Self noise, page 27
Ambient noise, page 30
Electrical self noise, page 30
Some means to reduce acoustic noise, page 30
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 SBP 29 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.
Signal-to-noise ratio (often abbreviated SNR or S/N) is a measure used in
science and engineering that compares the level of a desired signal to the level of
background noise. It is defined as the ratio of signal power to the noise power, often
expressed in decibels. A ratio higher than 1:1 (greater than 0 dB) indicates more
signal than noise. While SNR is commonly quoted for electrical signals, it can
be applied to any form of signal [...].
Wikipedia, Copied September 2013
SBP 29 Installation Manual