Graphics Programs Reference
In-Depth Information
Fig. 10.8 shows a graph for versus and . This figure can be
reproduced using MATLAB program
Ðfig10_8.mÑ
given in Listing 10.6 in
Section 10.5. This graph will be utilized in the analysis and of the expected M
2
signal processing performance.
σ
f
C
chaff
⁄
S
τ
C
chaff
⁄
S
and
τ
.
Figure 10.8. Single pulse thermal noise error versus
Multiple MTI (M
2
) Doppler Filter Design
The M
2
Doppler filter design is derived from the theoretical N-tap delay line
MTI canceller. The general formula for the improvement factor was derived in
Chapter 7
(Section 7.7.2). A bank of MTI Doppler filters that cover the fre-
quency range from 0 to the PRF will achieve performance beyond that of a
conventional MTI. The weights are given by:
N
j
2π
i
(
1
)
------------------------
kN
⁄
W
ik
=
e
(10.30)
,
where the index is between 0 to N-1 and corresponds to the MTI Doppler
filter bank. In this design, a 5-tap delay line MTI filter is considered. The trans-
fer function for the overall Doppler bank is
k
N
N
∑
H
k
(
j
2π
)
i
(
1
)
fT
(
k N
⁄
)
()
=
e
(10.31)
i
=
1
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