4.
Summary.
In this lesson, you learned about the concepts and
methods of jamming, the frequency control methods applied to EW. You
also learned about the methods of deception used to confuse or
distract enemy forces.
a. Jamming is the deliberate radiation or reradiation of energy
to prevent or degrade the reception of information by a receiver.
Three methods of communication jamming are commonly used on the
battlefield. Each is used to attack a different signal or signals.
(1) There are several methods of communications jamming. Spot
jamming is directed against a single or specific frequency, while
allowing adjacent frequencies to remain free of the effects of the
jamming.
Barrage jamming is targeted against multiple frequencies.
Sweep jamming is used to block several preselected frequencies.
(2) Various types of signal modulation can be used during
jamming.
Some of the common modulation types are stepped tones,
bagpipes, gulls, and spark.
(3) Reradiation jamming normally uses special equipment and is
directed against non-communications emitters.
(4) The three major systems for jamming missions are ground-
based systems, airborne platforms, and expendable jammers.
Several
factors determine the delivery vehicle.
They include target link
distance, jammer-to-receiver distance, terrain factors, effective
radiated power quotient, signal compatibility, and environmental
factors.
b. Control mechanisms are established to ensure the success of
all jamming missions, the protection of friendly communications, and
the direction of jamming against HVT.
Positive control mechanisms
ensure that the mission may be terminated at any time.
Negative
control mechanisms protect specific frequencies from being jammed,
except as authorized on a jamming restriction list.
c. Electronic deception is normally used to cause the enemy
analysts to misread the situation and provide his commander with
information and intelligence which, while in appearance is accurate,
is actually misleading. The three types of electronic deception are
MED, SED, and IED.
The signal officer plans and executes both MED
and SED. IED is primarily an MI function.
SS0134
3-8
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