Graphics Programs Reference
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where , , , , ,
, , and (from
Chapter 3
). The search
pulsewidth is and the track waveforms are .
First consider the missile case. The single pulse SNR at the maximum detec-
tion range
G
=
34.5
dB
λ
=
0.1
m
T
e
=
290
Kelvin
F
=
6
dB
L
=
8
dB
0.5
m
2
4
m
2
σ
m
=
σ
a
=
P
t
=
20
KW
τ′
=
20µ
s
12.5µ
s
≤
i
≤
20µ
s
m
R
max
=
55
Km
is given by
)
2
10
3
6
10
3.45
)
2
20
×
×
20
×
10
×
(
×
(
0.1
×
0.5
SNR
m
=
--------------------------------------------------------------------------------------------------------------------------------------
=
(5.47)
)
4
4(
3
10
3
23
10
0.8
10
0.6
×
(
55
×
×
1.38
×
10
×
290
×
×
8.7028
⇒
SNR
m
=
9.39
dB
Alternatively, the single pulse SNR, with pulse compression, for the aircraft is
)
2
10
3
6
10
3.45
)
2
20
×
×
20
×
10
×
(
×
(
0.1
×
4
SNR
a
=
--------------------------------------------------------------------------------------------------------------------------------------
=
(5.48)
)
4
4(
3
10
3
23
10
0.8
10
0.6
×
(
90
×
×
1.38
×
10
×
290
×
×
9.7104
⇒
SNR
m
=
9.87
dB
Using these calculated SNR values into the MATLAB program
Ðmyradar_visit2_2.mÑ
(see
Chapter 2)
yields
P
DC
Aircarft
=
0.999
(5.49)
P
DC
Missile
=
0.9984
which clearly satisfies the design requirement of
P
D
≥
0.995
.
Next, consider the matched filter and its replicas and pulsed compressed out-
puts (due to different waveforms). For this purpose use the program
Ðmatched_filter_gui.mÑ.
Assume a receive window of 200 meters during
search and 50 meters during track.
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