Page 11 - Forum-2021-JanToMarch

proximates the position
of one position of the
observed object as shown
in the right image. In this
case, the B-767’s position
(intersection of both lines
of sight) was located,
considering the potential
errors.
The images in Figure 8
show one single frame of
Figure 9. Attitude error +/-10 degrees visualized (blue/cyan), heading (left), pitch (middle), roll (right). the video. The left image
shows the outline of the
aircraft behind trees. To
determine the attitude of
the aicraft, a 3-D model
of a B-767 was placed in
the 3-D software applica-
tion at the reconstructed
position and the attitudes
of the aircraft such as
heading, pitch, and roll
were adjusted until the
objects fitted best to the
outline in the image. The
accuracy for attitude
reconstruction depends
on the resolution of the
frame. However the
potential error can be up
to +/- 10 degrees based on
experience.
To better explain the
reason for the experi-
enced size of the error in
attitude, Figure 9 shows
the visual differences.
The modified values for
+/-10 degrees are visu-
alized in blue and cyan
and overlayed. Based on
Figure 10. Illustration of the reconstructed flight path with error tunnel (white circles) that shows the
line of sight from the first observing camera (light blue) and second observing camera (dark blue). the experience of several
reconstructions and video
data, a good fit could be
determined within the
maximum error of +/-10
degrees for all three axis.
The reconstructed flight
path was compared to the
original FDR data (shown
in Figure 12, page 12) that
was recovered from the
B-767 wreckage. Figure
11 shows in latitude and
longitude the flight path
that could be reconstruct-
ed in black. The original
flight path (grey) is close
to the reconstructed path
Figure 11. Reconstructed flight path (black), FDR flight path (grey), and error tunnel (blue). (black) and within the
January-March 2021 ISASI Forum • 11