IMAGENEX DT101Xi, Technical Manual

Page: 28 / 64

Doc no: 430-041-01 28 of 64
Figure 4-7 Yaw lines
The yaw offset can be approximated, using the following equation (Eq 17):
𝛾 = sin
−1
(
𝑑
𝑎
/2
𝑥
𝑖
)
(Eq 17)
Where
γ
= Yaw offset (deg)
d
a
= along-track displacement h
x
i
= The relative cross track distance for beam i (m)
Figure 4-8 shows the along-track profiles and represent the apparent seafloor swept by the outer beams. The
along-track displacement d
a
in the apparent seafloor is caused by the azimuthal offset
γ
.
Figure 4-8 [sketch courtesy of A Godin]
Prior to processing, the pitch correction derived in Section 4.2.2 4.2.1should be applied.
A data set should be extracted and processed as indicated by the red line in Figure 4-7 and processed using
the patch test utility in the MBES processing package.