Graphics Programs Reference
In-Depth Information
4π
3
r
4
λ
2
σ
=
--------------
θ
=
0°
(11.35)
For non-normal incidence, two approximations for the circular flat plate
backscattered RCS for any linearly polarized incident wave are
λ
r
8πθ
σ
=
-----------------------------------------
(11.36)
)
2
sin
(
tan
()
σ
k
2
r
4
2
J
1
(
2
kr
sin
θ
)
2
)
2
=
---------------------------------
(
cos
θ
(11.37)
2
kr
sin
θ
where , and is the first order spherical Bessel function evalu-
ated at . The RCS corresponding to Eqs. (11.35) through (11.37) is shown in
Fig. 11.20
.
These plots can be reproduced using MATLAB function
Ðrcs_circ_gui.mÑ
.
k
=
2πλ
⁄
J
1
()
β
Direction to
receiving radar
Z
θ
r
Y
X
ϕ
Figure 11.19. Circular flat plate.
MATLAB Function Ðrcs_circ_plate.mÑ
The function
Ðrcs_circ_plate.mÑ
calculates and plots the backscattered RCS
from a circular plate. It is given in Listing 11.7 in Section 11.9; its syntax is as
follows:
[rcs] = rcs_circ_plate (r, freq)
where
Symbol
Description
Units
Status
r
radius of circular plate
meters
input
freq
frequency
Hz
input
rcs
array of RCS versus aspect angle
dBsm
output
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