Graphics Programs Reference
In-Depth Information
where
T
=
1
⁄
PRF
(10.32)
It follows that the magnitude of the frequency response is
sin
(
π
NfT k N
(
⁄
)
)
H
k
()
=
-----------------------------------------------
(10.33)
sin
(
π
fT
(
k
⁄
N
)
)
The impulse response for a
kth
5-tap MTI filter is
y
k
()
v
k
=
() 5
v
k
(
tT
)
+
10
v
k
(
t
2
T
)
(10.34)
10
v
k
(
t
3
T
)
+
5
v
k
(
t
4
T
)
v
k
(
t
5
T
)
v
k
is the input signal. The corresponding transfer function is
Y
k
)
5
() 25
=
(
sin
(
π
fT
)
(10.35)
approximately the clutter and signal bandwidth, the combined per-
formance of the M
2
Doppler filter performance is greater than that of a single
delay-line canceller that does not utilize Doppler information. The clutter miti-
gation performance of the M
2
Doppler filter, however, will likely be deter-
mined by the coherence times of the target and/or the clutter.
(
1
⁄
N
)
th
v
…
Delay by T
Delay by T
Delay by T
W
1
W
2
W
N
…
5-tap MTI
5-tap MTI
5-tap MTI
Y
1
Y
2
Y
N
Amplitude
-4/NT -3/NT -2/NT -1/NT 0 1/NT 2/NT 3/NT 4/NT
Figure 10.9. Block diagram for the M
2
algorithm, and corresponding
frequency response of the MTI filters (N=8).
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