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1
m
2
grazing angle
ψ
g
=
20°
. The target RCS is
σ
t
=
. Assume that the clut-
σ
0
ter reflection coefficient is
=
0.0136
. Compute the SCR.
Solution:
The SCR is given by Eq. (6.10) as
cos
σ
0
θ
3
dB
Rc
τ
2σ
t
ψ
g
---------------------------
⇒
(
SCR
)
C
=
()() 20°
(
cos
)
. 6 0
4
(
SCR
)
C
=
---------------------------------------------------------------------------------------------------------
=
×
) 3 0
8
) 2 0
6
(
0.0136
) 0.02
(
) 20000
(
(
×
(
×
)
It follows that
(
SCR
)
C
=
32.4
dB
Thus, for reliable detection the radar must somehow increase its SCR by at
least
(
32
+
X
)
dB
, where
X
is on the order of
13
to
15
dB
or better.
6.2.2. Radar Equation for Area Clutter - Ground Based Radar
Again the received power from clutter is also calculated using Eq. (6.9).
However, in this case the clutter RCS
σ
c
is computed differently. It is
σ
c
=
σ
MBc
+
σ
SLc
(6.11)
where
σ
MBc
is the main beam clutter RCS and
σ
SLc
is the sidelobe clutter
RCS, as illustrated in Fig. 6.6.
main beam
clutter
sidelobe
clutter
Figure 6.6. Geometry for ground based radar clutter
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