EW3 - Electronic Attack - Jamming Flashcards

1
Q

State the three sub-divisions of Electronic Attack

A

3 sub-divisions:
– Jam.
– Deceive.
– Neutralise.

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2
Q

List the four main EA equipment types

A
  • Radar Jammers:
    – Electronic noise jamming &,
    – Electronic deception jamming.
  • IR Jammers:
    – Directed IR countermeasures (DIRCM).
  • Countermeasure dispensing systems (CMDS):
    – Chaff & flares.
  • Decoys.
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3
Q

Describe jamming.

A

The use of mechanical devices or electromagnetic transmissions to interfere with adversary electronic devices, equipment or systems.

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4
Q

State the two forms of jamming.

A

2 Forms:
– Electronic jamming;
* Friendly transmission to render an adversary transmission unusable.

– Mechanical Jamming;
* Chaff or decoys to clutter a sensor.

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5
Q

Describe Spot jamming.

A
  • Continuous jamming of one radar on one specific freq.
  • Requires precise knowledge of victim parameters.
  • Ineffective against multiple radars on diff. freq.
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6
Q

Describe Barrage jamming.

A
  • Transmit noise across a given bandwidth.
  • Allows jamming of several transmitters on diff. freq. (incl. frequency agile) simultaneously.
  • Disadvantage:
    – Power is spread = less power on any given freq.
    – Wasted power on freq. not being used.
    – Need as high a power output as possible.
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7
Q

Describe Swept Spot jamming.

A
  • Required when there are not enough spot jammers to counter multiple radars or when the radar is spread over a wide bandwidth.
  • Continuous movement of a ‘spot’ frequency of noise across a selected bandwidth.
  • Sweep should be fast enough to re-saturate the receiver before it recovers.
  • Advantages of both spot and barrage jamming.
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8
Q

State the limitations of Chaff.

A
  • May negate noise jamming.
  • May alert unaware enemy
  • Only effective against radar guided missiles.
  • Enemy radars characteristics must be known for appropriate chaff packages.
  • Chaff cloud characteristics (fall rates) must be known for optimal employment.
  • Limited effectiveness against advanced radars.
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9
Q

Explain Power Centroid Tracking

A
  • Radar adjust its aim point to maximise total return.
  • Radar will ‘break-lock’ on the aircraft if:
    – Separation between aircraft & countermeasure increases to > 1 RRC.
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10
Q

What are the Jamming applications

A

** Jamming Against Surveillance Radars.

– To avoid detection;
– Electronic jamming (induce noise/confusion).

** Jamming Against Weapon Radars.

– If detected, induce error so the weapon misses.
– Jam so that the system cannot counter your attack.

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11
Q

How is noise jamming achieved

A
  • Achieved by:
    – Generating random noise energy.
    – Amplifying it.
    – Radiating it towards threat.
  • If receiver SNR < 1, noise
    jamming is taking place
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