Graphics Programs Reference
In-Depth Information
π
b
4
c
2
σ
=
--------------------------------------------------------------
(11.33)
)
2
a
2
)
2
c
2
)
2
(
(
sin
θ
+
(
cos
θ
and for the case when
abc
==
,
σ
c
2
=
(11.34)
Note that Eq. (11.34) defines the backscattered RCS of a sphere. This should
be expected, since under the condition the ellipsoid becomes a
sphere. Fig. 11.18a shows the backscattered RCS for an ellipsoid versus for
. This plot can be generated using MATLAB program
Ðfig11_18a.mÑ
given in Listing 11.5 in Section 11.9. Note that at normal incidence (
abc
==
θ
ϕ
=
45°
θ
=
90°
)
the RCS corresponds to that of a sphere of radius
c
, and is often referred to as
the broadside specular RCS value.
Figure 11.18a. Ellipsoid backscattered RCS versus aspect angle.
MATLAB Function Ðrcs_ellipsoid.mÑ
The function
Ðrcs_ellipsoid.mÑ
computes and plots the RCS of an ellipsoid
versus aspect angle. It is given in Listing 11.6 in Section 11.9, and its syntax is
as follows:
[rcs] = rcs_ellipsoid (a, b, c, phi)
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