0747-SOM-00002-02
Page 32 of 33
General System Operation
Sonar Operational Notes
When using a dual frequency 1200ik multibeam sonar there are some operational factors which
must be considered in order to make best use of the dual channel capability of the sonar.
Dual Frequency Options
720 kHz Low Frequency Operation
The sonar has a 120° horizontal field of view at +/- 10° about the horizontal
axis (20° in total). In this mode of operation the sonar can image targets
up to its maximum range however the definition of targets will be lower
than when used in its higher frequency mode.
1200 kHz High Frequency Operation
The sonar has a 120° horizontal field of view at +/- 6° about the horizontal
axis (12° in total) which is a slightly reduced vertical beam-width when
compared with the lower frequency channel. This mode will produce
higher definition images compared with the lower frequency mode. In high
frequency (1200kHz) mode, the user has the option of switching to using
just a 65° sector which will double the update rate when compared to
utilising the full 120° sector scan.
High frequency (HF) 1200 kHz will work best up to 40m range scale providing the user with higher
resolution images than if operating on the lower (LF) 720 kHz channel. Due to acoustic principals the
effectiveness of 1200 kHz operation drops of significantly at range. When operating in auto frequency
mode the sonar will automatically switch to LF operation above 40m range.
For more details on Genesis operation see the QS guide on our website here:
https://www.tritech.co.uk/media/products/software-manual/gemini-1200ik-genesis-software-quick-
start-guide-gemini.pdf
