Graphics Programs Reference
In-Depth Information
Figure 10.7. Range reduction factor versus jammer peak power. This plot was
generated using the function
Ðrange_red_factor.mÑ
.
10.4. Chaff
In principle, chaff is composed of a large number of small RF reflectors that
have large RCS values. Chaff is usually deployed around the target as means of
ECM. Historically, chaff was made of aluminum foil; however, in recent years
most chaff is made of the more rigid fiber glass with conductive coating.
Chaff can be categorized into two types: (1) denial chaff and (2) deceptive
chaff. In the first case, the chaff is deployed in order to screen targets that
reside within or near the deployed chaff cloud. In the second case, the chaff
cloud is dispersed to complicate and/or overwhelm the tracking and processing
functions of the radar by luring the tracker away from the target and/or creating
multiple false targets.
The maximum chaff RCS occurs when the individual chaff-dipole length
L
is one half the radar wavelength. The average RCS for a single dipole when
viewed broadside is
0.88λ
2
σ
chaff
1
≈
(10.24)
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