Kongsberg Simrad SN90 Reference Manual page 22

Purse seine and trawling sonar

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Simrad SN90 Reference Manual

• It is common for sonars to require many pings to build the various views in the echo

presentation. On the SN90, all the sonar views in the presentation are built using

the echoes from one single ping. This dramatically improves the update rate and

provides better real-time information.

• The SN90 system permits you to record real-time sonar situations. This allows you to

replay complete sequences. The playback contains the exact same echo information,

and can be used for mission history, training or troubleshooting purposes.

Great emphasis has been placed on an intuitive user interface and the best possible sonar

presentations on a high resolution colour display.

The SN90 system is equipped with the celebrated signal processing software developed

by Kongsberg Discovery. This includes Hyperbolic FM (HFM) transmissions. This

pulse type is also known as "chirp". It ensures a clutter free picture with very high

resolution in range. The signal processing and beamforming is performed in a fast digital

signal processing system using the full dynamic range of the signals.

The SN90 system software operates using the Microsoft

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