R2Sonic 2022, Operation Manual

Page: 48 / 133

Page 48 of 133
Version 3.0 Rev r000
Date 25-08-2010
Part No. 96000001
Figure 41: Sector Rotate
6.4.5 Bottom Sampling
There are two options: Equiangular or Equidistant. In equidistant mode, all beams are equally
distributed, within the sector. There are limits to what the equidistant can do, based on opening
angle and bottom topography; it is best on flat sea floor and with an opening angle (Sector
Coverage) equal to, or less than, 130°.
6.4.6 Mission Mode
The versatility, built into the Sonic 2024/2022, is further enhanced with the ability to adapt the
system to the nature of the survey task: normal survey or surveying a vertical feature. There are
two Mission Modes:
•
Bathy Norm : Normal bathymetry survey
•
Bathy VFeature : With the ability to map vertical surfaces, without physically rotating the
sonar head, this Mission Mode provides improved detection methods tailored to mapping
vertical features. This specialised mode greatly reduces the corner ‘ringing’ seen in older
technology systems.
The Mission Mode can be changed on the fly, with no need to stop recording data.
The sector can also be rotated using the mouse
cursor, in the wedge display. Position the cursor
on the curved bottom of the wedge; the cursor
will change to a horizontal double arrow, the
wedge can now be rotated to port or starboard.
The angle of rotation is numerically visible in the
lower left hand corner of the wedge display
during rotation. A clockwise rotation is positive,
an anti-clockwise rotation is negative.
The change only takes place when the mouse
button is released.