Figure 31: Beam Spacing; Figure 32: Across-Track Sounding Location On A Flat Bottom - Teledyne SeaBat T Series Operator's Manual

SYSTEM PERFORMANCE AND DATA TYPES
Assuming one sounding is generated from the intersection of the beam center with the seafloor,
with equidistant spacing, the appropriate number of beams is formed to maintain this nadir
sounding spacing across the entire swath. See also Figure 31.
Reduced Center-to-Center Spacing
at Large Steering Angles
In order to achieve this uniform sounding spacing, it is necessary to decrease the beam center-to-
center spacing which requires a significant increase in the number of beams formed.
The beamformer is able to generate a receive beam centered on any angle within the available
swath and with equidistant spacing a set of coefficients is selected that form a set of receive
beams that are centered on the midpoints of the footprints.
Figure 32 shows the difference in distribution between equiangular and equidistant spacing.
SeaBat T-Series Subsea Operator's Manual
Version 7
Wider Center-to-Center
Spacing at Nadir

Figure 31: Beam Spacing

Figure 32: Across-Track Sounding Location on a Flat Bottom

Page 59 January 31, 2019