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SYSTEM PERFORMANCE AND DATA TYPES
SeaBat T-Series Subsea Operator's Manual
Page 58
January 31, 2019
Version 7
7.2.2 Equi-Distant, Equi-Angle, and Intermediate Modes
As the beam steering angle increases from nadir, the number of beams per degree of swath
stays constant for equiangular spacing while it increases for equidistant spacing.
presents the number of beams as a function of steering angle for a 1° nadir beam spacing.
Figure 29: Beam Density
shows that the
horizontal spacing of the
Intermediate mode increases
with beam angle, unlike Equi-
distant mode where the
spacing stays constant.
However, the Intermediate
mode increases the spacing
much slower than the
Equi-angle mode so the outer
beam density is still quite
good.
Figure 30: Beam Spacing vs. Beam Angle
Assuming a flat bottom and using the beam footprint generated by the nadir beam, it may be
seen that the center-to-center spacing for each beam successively reduces as the departure from
nadir increases until at ±65° the beam density is approximately 2.5 times greater than at nadir.
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