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v
t
2
t
1
β
β
scatterer leaves
footprint
θ
θ
scatterer enters
footprint
-y
(a)
t
2
v
t
1
t
c
θ
1
θ
2
θ
1
=
90
(
θ 2
⁄
)
θ
θ
θ
2
=
90
+
(
θ 2
⁄
)
antenna beam
antenna beam
point target
(b)
Figure 12.8. Doppler history computation. (a) Full view; (b) top view.
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