Graphics Programs Reference
In-Depth Information
7.7.2. The General Case
A general expression for the improvement factor for the n-pulse MTI (shown
for a 2-pulse MTI in Eq. (7.51)) is given by
f
r
2πσ
t
2
n
(
1
)
1
I
=
---------------------------------------------
------------
(7.52)
Q
2
(
2
n
(
1
)
1
)!!
where the double factorial notation is defined by
(
2
n
1
)!!
=
13×…
×
×
×
(
2
n
1
)
(7.53)
2( !!
=
24… 2
n
×
×
×
(7.54)
Of course
0!!
=
1
;
Q
is defined by
1
Q
2
=
---------------
(7.55)
n
∑
A
i
2
i
=
1
Q
2
where
A
i
are the Binomial coefficients for the MTI filter. It follows that
for a 2-pulse, 3-pulse, and 4-pulse MTI are respectively
1
---
1
20
1
70
------
------
,
,
(7.56)
Using this notation, then the improvement factor for a 3-pulse and 4-pulse
MTI are respectively given by
f
r
2πσ
t
4
------------
I
3
=
2
(7.57)
pulse
f
r
2πσ
t
6
4
---
------------
I
4
=
(7.58)
pulse
7.8. ÐMyRadarÑ Design Case Study - Visit 7
7.8.1. Problem Statement
The impact of surface clutter on the ÐMyRadarÑ design case study was ana-
lyzed. Assume that the wind rms velocity . Propose a clutter
mitigation process utilizing a 2-pulse and a 3-pulse MTI. All other parameters
are as calculated in the previous chapters.
σ
w
=
0.45
ms
⁄
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