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ACTIVE SONAR USAGE
SeaBat T-Series Subsea Operator's Manual Page 37 January 31, 2019
Version 7
6.2.8.4 Minimum Grazing Angle
The minimum grazing angle is a limitation for the non-equiangular beam modes of the sonar. This
limitation is especially noticeable for a sonar with a tilted head (see
section 6.3.4 below ).
With a tilted head for Equi-Angle beam mode, there is no minimum grazing angle and the outer
beams can look ‘upwards’. With a tilted head for the other beam modes the sonar is limited and
cannot look ‘upwards’.
For the beam mode Intermediate, the minimum grazing angle is 5°, and for Equi-Distant and
FlexMode, the angle is 15°. For these three beam modes the outer beam cannot go higher.
Figure 8 provides a graphic illustration of the minimum grazing angle.
Minimum
Grazing
Angle
Equi
-Angle
Intermediate
Equi
-Distant
and Flex
Figure 8: Outer Beams for the Different Beam Modes with a Tilted Sonar Head
NOTE
When you want to look up with a tilted sonar head you have to select Equi-Angle beam mode.
6.2.9 Use of Beam Modes
The following beamforming modes are available: Equi-Distant, Equi-Angle, Intermediate, and
FlexMode (optional).
The system allows everything from high-density beams for exceptional image clarity and detail to
just a few beams to deliver results faster. By deploying fewer beams in shallow water, the system
allows the user to reduce storage requirements by gathering only the data you need. The system
can also hold constant seafloor spacing between beams to provide the same high-quality results
with minimal data volume.