o
~
o
N
~
~
r
~
~~
~
~
~
o 20 39 S9 78 98 117 137
Frequency (kHz)
100
ISO
200
Time ijlsec)
SO
0
'a"'
0
0
..
)
5
.:
:•..'
PYRAMID
o
S
I
2
3
41
4
SO
60
70
80
90_
o
D
D
Edge
View
Planar
View
~
~
~
o 20 39 S9 78 9. 117 137 1
Frequency (kHz)
200
100
ISO
nme~sec:)
SO
r---'V.\lllV1J"'N'
~ 1
H~-----10
20
30
40
4S
SO
60
70
80
90_
o
RECTANGLE
~
~
~
o 20 39
S9 7. 96 117 137 I
Ftequency (kHz)
SO
100
ISO
200
nme~sec:)
:.......~
,.
:.
..
".',
..•.
o
S
10
20
30
40
4S
SO
60
70
80
90_
o
CUBE
FIGURE
9.23. Targets and echoes of the targets used by Helweg et al. (1996). The target echoes are shown for different target aspect angles
varying from
0° to 90° in 10° steps. The 0° and 90° aspects correspond to the planar view of the target shown in the figure and the 45° aspect
corresponds to the edge view.