Oculus M-Series Sonar
User Manual
7
2.1.2.
Sonar Information
Sonar hardware information is shown at the top left of the display below the ‘Connection’ button –
this includes
the serial number of the connected sonar, network addresses and firmware version in use.
Sonar device settings can be adjusted by clicking the
‘Configure Sonar’ button –
this is discussed in further detail
in a subsequent section of the manual.
2.1.3.
Frequency Mode Control
Some Oculus sonars (with a ‘d’ name suffix) support dual frequency operation, where the current mode can be
chosen to be:
Low Frequency mode
has a 130° horizontal field-of-view and
allows the sonar to see targets up to it maximum range, but the
definition of targets is lower than the High Frequency mode
–
this
is commonly used for searching activities.
High Frequency mode
(where supported) has a reduced 80°
horizontal field-of-view and reduced maximum range compared
to Low Frequency mode. High Frequency mode provides high-
definition images of close-up targets and is commonly used for
inspection activities.
2.1.4.
Range Control
Use this slider to select the range the sonar image will represent on the display. As the range is increased, the
time required for the sound to reach the furthest targets and return will also increase so the image update rate
with slow down. Power consumption of the sonar will also increase at higher ranges as the receiver circuitry will
be active for longer periods of time while data is collected.
2.1.5.
Gain Control
Use this slider to control the gain of the sonar receivers
–
this can be thought of
like a “volume” control that can
be turned up to “hear” quieter target echoes or turned down if echoes are too loud and drowning out the quieter
ones.
As the display shows intensity of received echoes as colour brightness, the gain control has the effect of
brightening or darkening the display:
If the display is too dark and fine details cannot
be seen, then increase the gain.
Similarly, if the display is too bright (saturated),
then smaller targets and details may be lost so
reduce the gain.
