Graphics Programs Reference
In-Depth Information
Figure 10.1b. Burn-through range versus jammer and radar peak powers
corresponding to example used in generating Fig. 10.1a.
Burn-through Range
If jamming is employed in the form of Gaussian noise, then the radar
receiver has to deal with the jamming signal the same way it deals with noise
power in the radar. Thus, detection, tracking, and other functions of the radar
signal and data processors are no longer dependent on the SNR. In this case,
the S/(J+N) ratio must be calculated. More precisely,
P
t
G
σ
A
r
τ
4(
2
R
4
L
-----------------------
S
JN
-------------
=
-------------------------------------------
(10.10)
+
ER
( )
A
r
4π
R
2
B
J
----------------------
+
kT
0
where
k
is BoltzmanÓs constant and
T
0
is the effective noise temperature.
The S/(J+N) ratio should be used in place of the SNR when calculating the
the radar equation and when computing the probability of detection. Further-
more, S/(J+N) must also be used in place of the SNR when using coherent or
non-coherent pulse integration.
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