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EW > Exam > Flashcards

Exam Flashcards

1
Q

What is EW?

A

A military action that exploits electromagnetic energy to provide SA and create effects.

Can provide a commander with means to shape an EM environment in order to support ops (denying the same to adversaries).

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2
Q

State the military uses of the EM spectrum.

A

Radio (Radio Waves)
Radar (Microwaves)
EO (IR and EO)

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3
Q

Name the 3 sub divisions of EW.

A

Electronic Attack
Electronic Defence
Electronic Support

(EEESAD)

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4
Q

Name the EW measures used to achieve EA, ED & ES.

A

Electronic Support Measures
Electronic Counter Measures
Electronic Protective Measures

(PCS)

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5
Q

Define Electronic Attack

A

Prevent/reduce effective use of the EM spectrum by:

Jamming
Deception
Neutralisation

(Jack Drinks Nothing)

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6
Q

What is Electronic Neutralisation?

A

Use of EM energy to either

Temporarily
Permanently

Damage enemy devices that rely on the EM spectrum

(SEAD/DEAD)

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7
Q

What is SEAD

A

Suppression of Enemy Air Defence

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8
Q

What is DEAD

A

Destruction of Enemy Air Defence

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9
Q

What is Jamming?

A

Deliberate radiation/re-radiation/reflection of EM energy to impair effectiveness of enemy electronic systems and equipment

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10
Q

What is Deception?

A

Deliberate radiation/re-radiation/alteration/reflection of EM energy to confuse, distract or seduce an enemy electronic system.

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11
Q

What is ED?

A

Electronic Defence.

The use of EM energy to provide protection to friendly forces and to enable effective use of EM spectrum.

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12
Q

Name the EW measures to achieve ED

A

Falls under Electronic Protective Measures (EPM) :

Passive
Active
Emcon
Electronic masking

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13
Q

Describe passive ED protection

A

Protection from friendly and adversary EW activity.

Planning, training, design of equipment

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14
Q

Describe active ED measures

A

Achieved through measures such as

Frequency hopping (HavQuick)
Burst transmission
Changing polarisation of radar pulse (plane of wave relative to earth surface)

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15
Q

Describe EMCON

A

Selective and controlled use of EM, acoustic or other emitters to optimise C2 capabilities

Minimising detection

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16
Q

Describe electronic masking in ED

A

Controls EM radiation on friendly frequencies, to protect the emission characteristics of comms & electronic systems against an enemies ES.

E.g. Encryption

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17
Q

What is ES?

What is it split into?

A

Electronic Support.

Monitors use of EM spectrum (actively/passively). Data then provided SA & supports Intel.

Split into:
ESM (Threat warning)
SIGINT

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18
Q

What is SIGINT split into?

A 
Electronic intelligence (ELINT)
Comms Intelligence (COMINT)
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19
Q

Name the 3 main ES threat warning systems.

A

Radar Warning Receiver (RWR)
Missile Warning Receiver (MWR)
Laser Warning Receiver (LWR)

(Rate My Life)

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20
Q

The lower the frequency the…

A

Larger the antennae

Longer the wavelength

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21
Q

The higher the frequency the..

A

Smaller the antennae

Shorter the wavelength

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22
Q

What is Radar?

A

Radio Detection And Ranging.

Process of detecting and locating a contact by means of reflected radio energy (Primary Radar)

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23
Q

What is a Radar Mile?

A

The time taken for a pulse to travel to a target distance of one mile & return

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24
Q

What is Radar Horizon?

How do we work out Radar Horizon?

A

How far a Radar can see (no obstructions).

Calculation:

1.23 × ( /Antenna Height)

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25
Q

What is the Radar Cross Section?

What are the factors that affect RCS?

A

How detectable an object is using radar.

Size
Shape
Aspect (Side on/ Head on)
Material
Lumps, bumps, angles, cavities
26
Q

What are the Pulse Radar Parameters?

A

A train of pulses is categorised by the number of pulses per second and width of each pulse:

PRF (Frequency)
PRI (Interval)
PW (Width)

27
Q

What is the Pulse Width?

A

Length of pulse in Nanoseconds

Also called pulse duration/length

28
Q

Define minimum detection range

A

The minimum range to which the receiver cannot receive reflected energy (as it is still sending a pulse).

Affected by the pulse width (balance of power output vs min detection range)

29
Q

What is target discrimination

A

Denoted by the pulse width and how much of the waves are bounced back.

Larger pulse widths won’t discriminate between two targets but is higher range (and vice versa).

30
Q

What is the Pulse Interval?

A

Time between the start of one pulse to the start of the next pulse

Inversly proportional to PRF

31
Q

What is the PRF?

A

Pulse Repetition Frequency

Number of pulses transmitted in one second

Can be called PPS(Pulse Per Second) / Hertz

32
Q

What is the MUR?

A

Maximum Unambiguous Range.

The longest range to which a transmitted pulse can travel out and back again between consecutive transmitted pulses

33
Q

What is the calculation for MUR?

A

MUR= (1/2 x Speed of Light) / PRF

The software is designed to not count the pulses after a certain time (stops counting outside range scale) in between Pulses

34
Q

What are the three scan types?

A

Circular (A)
Antenna is centre, scans around

Sector (B)
Antenna scans in front of aircraft, sweeping motion

Raster (C)
Sweeps up and down to find height

35
Q

What is the Ariel Rotation Period? (ARP)

A

The rate at which the scanner must rotate in order to receive all responses out to a certain range before moving azimuth

36
Q

What are the 3 types of display?

A

Type A:
Shows range and downrange bearing. Gives indication of range and size of target (if side on to scanner)

Type B:
Gives range and changing bearing (to target, relative to aircraft). Gives in a grid display.

PPI (Plan Position Indicator):
Gives bird eye view of radar
North is top
Usually centred to yourself (can be centred on target)

37
Q

What is PPI

A

Plan Position Indicator

Type of radar display (bird eye view)

38
Q

What are the 5 countermeasures used by systems

A 
Deceptive Jamming
Noise Jamming
Frequency Agility
Chaff
Towed Radar Decoy (TRD)
39
Q

Describe Deceptive Jamming

A

Transmits exact frequency to search radar ahead of time to deceive the radar (creates false targets)

40
Q

Noise Jamming

A

Transmits a noisy picture based on beam width
Can only jam known adversary frequencies
Radar burn through can occur when the adversary radar has more power (overrides the noise)

41
Q

Describe Frequency agility

A

Like HavQuick, radars can also hop frequencies

Stops adversaries from Jamming frequencies
Can be used as a ‘de-clutter’ technique

42
Q

Describe Chaff

A

Used to create spurious EM signals and deceive missiles and radar.

Different sized strips create different wavelengths, and the chaff blooms to create pockets of spurious signals in the air

Light materials are used to linger (e.g. Fibreglass)

43
Q

Describe TRD

A

Towed Radar Decoy
Acts as a decoy for incoming missile systems
Prevents acquisition by giving off larger Radar Cross Section than host aircraft
Needs comprehensive Mission Dependant Data to be effective

44
Q

Meaning of EW

A

Any military action that involves the use of the EM spectrum

45
Q

Name the anatomy of a missile

A 
Motor
Fuel
1st stage booster/ Ejector
Sensor/ Seeker Head
Data-Link
Guidance and Control Computer
Warhead
46
Q

Missile engagement process

A 
Search
Acquire
Track
Launch
Intercept
47
Q

Missile Guidance loop

A

Sensor
Error
Guidance computer
Steering command

48
Q

Missile Guidance Techniques

A 
Command Guidance (CLOS & COLOS) 
Beam Riding 
Homing (Passive) 
Homing (Semi Active) 
Homing (Active) 
Track Via Missile
49
Q

Name the 4 characteristics of CMD guidance

A

Not fire & forget
Overt
Susceptible to countermeasures
Signal strength decreases as the missile gets closer to target

50
Q

4 characteristics of Beam Riding

A

Not F&F
Overt
Susceptible to tactics
Slightly less strength at target (negligible)

51
Q

4 characteristics of Passive Homing

A

F&F
Covert
Susceptible to flares
Strength increases closer to target

52
Q

4 characteristics of Semi-Active Homing

A

Not F&F
Overt
Susceptible to CM
Strength increases closer to target

53
Q

4 characteristics of Active Homing

A

F&F
Overt
Susceptible to chaff
Strength increases closer to target

54
Q

4 characteristics of Target Via Missile

A

Not F&F
Overt
Susceptible to CM
Strength increases closer to target if active, less if CMD

55
Q

What is MEZ and what Pro word does it use?

A

Missile Engagement Zone

Trespass

56
Q

What do we call when an Aircraft encroaches the MEZ?

A

Callsign
TRESPASS
Location
System

57
Q

Four components of a radar system?

A

Frequency
PRF
PW
ARP

58
Q

What does ARP matched with and what does it affect?

A

MUR

Data link

59
Q

What is the ESM advantage?

A

When we can detect EM energy outside the theoretical MUR of the target radar

60
Q

What are the principle uses for ESM?

A

Intercept
Identify
Locate

61
Q

What three things does the DOA measure?

A

Time
Amplitude
Phase

On adjacent ariels

62
Q

15000ft =150nm for radar horizon

A

EW (2 decks)

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