Gemini Software Operation
Gemini 720is Imaging Sonar
Document: 0703-SOM-00002, Issue: 1
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© Tritech International Ltd.
This improves the clarity of the target, but can give the effect of dark bands in the background
image. When turned off the Gemini will always use the gain slider setting. If bright targets are
observed and a high gain setting is used, the target will appear to spread out in the displayed
image.
Note
The Gain Assist setting can be changed during operating the Gemini live and
when replaying logged data but cannot be changed for log files created with
software versions prior to 1.16.0 for which it will always be turned ON.
5.1.15. Gain Control
The Gain slider at the bottom left hand side of the display is used to change the gain level
being used by the Gemini head, and is expressed as a percentage between 0 (no gain being
applied) and 100 (full gain being applied).
The gain can be changed by either clicking on the dark blue indicator showing the current gain
position in the slider and dragging it left or right, or by using the arrows at the end to change
the gain one step at a time. The arrows are designed for fine control of the gain and operate
one step per click and clicking on the arrows and holding them down will have no effect.
The gain can also be altered using keyboard shortcuts ('z' to decrease gain, 'a' to increase
gain).
5.1.16. Range Control
The Range slider at the bottom left hand side of the display is used to change to the range
of the image being acquired by the Gemini head.
The range can be changed by either clicking on the dark blue indicator showing the current
range position in the slider and dragging it left or right, or by using the arrows at the end to
change the range one step at a time. The arrows are designed for fine control of the range
and operate one step per click and clicking on the arrows and holding them down will have no
effect. The range control has been implemented with a logarithmic scale so that the smaller
values of range can be more precisely selected.
The range can also be altered using keyboard shortcuts ('c' to decrease range, 'd' to increase
range).
5.1.17. Indicators
When the mouse pointer is within the ‘cone’ on the sonar display (that is over the displayed
sonar image), the indicators at the bottom right hand side of the screen will show the position
of the mouse pointer relative to the origin of the display (that is relative to the Gemini Sonar).