Graphics Programs Reference
In-Depth Information
The range at which the radar can detect and perform proper measurements
for a given S/(J+N) value is defined as the burn-through range. It is given by
1
---
ER
( )
A
r
8π
B
j
kT
0
2
P
t
G
σ
A
r
τ
4(
2
L
ER
( )
A
r
8π
B
j
kT
0
----------------------
R
BT
=
+
---------------------------------------------
----------------------
(10.11)
S
JN
-----------------
kT
0
(
+
)
MATLAB Function Ðsir.mÑ
The MATLAB function
Ðsir.mÑ
implements Eq. (10.10). It generates plots
of the S/(J+N) versus detection range and plots of the burn-through range ver-
sus the jammer ERP. It is given in Listing 10.2 in Section 10.5. The syntax is as
follows:
[SIR] = sir (pt, g, sigma, freq, tau,T0, loss, R, pj, bj, gj, lossj)
where
Symbol
Description
Units
Status
pt
radar peak power
W
input
g
radar antenna gain
dB
input
sigma
target cross section
input
m
2
freq
radar operating frequency
Hz
input
tau
radar pulsewidth
seconds
input
T0
effective noise temperature
Kelvin
input
loss
radar losses
dB
input
R
range. can be single value or a vector
Km
input
pj
jammer peak power
W
input
bj
jammer bandwidth
Hz
input
gj
jammer antenna gain
dB
input
lossj
jammer losses
dB
input
SIR
S/(J+N)
dB
output
Fig. 10.2
shows some typical outputs generated by this function when the
inputs are as follows:
Input Parameter
Va l u e
pt
50KW
g
35 dB
sigma
10 square meters
freq
5.6 GHz
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