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ISR EW > Revision Session > Flashcards

Revision Session Flashcards

1
Q

What are the 3 military uses of the EM spectrum?

A

Radio, Radar, EO

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2
Q

Fully draw out the Venn diagram.

A

EA — jamming, deception, neutralisation
EP —- EMCON, Masking, Hardening, wartime reserve modes
ES —- SIGINT (COMINT/ELINT), threat warning (RWRs, MWs, LSR)

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3
Q

What are the generic warning receiver components?

A 
Power supply
Processor
Control unit
Display
Aerials
Audio
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4
Q

What are the characteristics of a radar warning receiver?

A

Overt
Short range
Accurate In range

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5
Q

What does the IR sensor detect?

A

Heat signatures from:
Motor
Motor plumes (exhaust)
Residual heat post burn out

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6
Q

What does UV Missile warning receiver detect?

A

UV signature that is in the solar blind spot caused by the lighting of the fuel

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7
Q

What does the radar missile warning receiver receive?

A

Relative velocity (from Doppler shift) and cross section of the missile

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8
Q

What is the missile engagement process?

A 
Search 
Acquire
Track
Launch
Intercept
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9
Q

What are the components of a radar?

A 
Master timing generator
Modulator 
Occilator
Transmit/receive switch 
Aerial
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10
Q

What does the master time generator do?

A

Produces timing pulses
Controls PRF
Controls modulator (on/off)

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11
Q

What does the Modulator do?

A

Creates the pulse

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12
Q

What does the oscillator do?

A

Creates the frequency

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13
Q

What is the difference between a primary and secondary radar?

A

Primary radar works from receiving reflected signals whilst secondary needs a transponder response

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14
Q

What is mode 1?

A

Aircraft function

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15
Q

What is mode 2?

A

Aircraft identification

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16
Q

What is mode 3?

A

Says who is controlling you

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17
Q

What is mode 5?

A

Encrypted data transfer

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18
Q

What is mode S?

A

24 bit unique aircraft address, used in TCAS

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19
Q

Which missiles are multiple engagement?

A

Command
(CLOS)
(COLOS)

Track via missile

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20
Q

What are the three elements of electronic attack?

A

Jamming
Deception
Neutralisation

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21
Q

What are the different types of jamming?

A

Noise

Deception

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22
Q

What is ‘burn though’?

A

When the tracking radar overpowers the jamming radar so they still get a signal despite the jamming

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23
Q

What are the different types of RWRs?

A

Superheterodyne

Digital crystal video receiver

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24
Q

What are the characteristics of IR missile warning system?

A

High false returns
Can detect the missile from start to end (theoretically)
Detects the heat signatures

25
Q

What are the characteristics of radar missile warning receiver?

A

Accurate range detection
Short range
Overt

26
Q

What are the characteristics of UV Missile warning system?

A

Operates on solar blind
Low false returns
Short range as attenuated by atmosphere/ozone

27
Q

What are the requirements for a missile warning receiver?

A 
Spherical coverage 
Long range 
Accurate
Low false returns
Speed 
Threat lethality assessment
High probably of detection
28
Q

How do you defend against lasers?

A 
Absorb
Reflect
Ablation (dissipate) 
Eye protection
Jamming
29
Q

What are the three consecutive actions of a missile warning system? (Threat warning sequence)

A

Locate
Track
Declare

30
Q

What are the 4 principles of COMSEC?

A

Physical
Personnel
Transmitting
Crypto

31
Q

What are the components of a missile?

A 
Motor
1st stage booster 
Data link
War head
Guidance computer/control 
Sensor
32
Q

What are the phases of missile launch?

A

Launch (boost)
Mid course (sustain)
Terminal (coast)

33
Q

What is the missile guidance loop?

A

Sensor
Error
Guidance computer
Steering

34
Q

What are the principles of flares?

A

Peak intensity
Rise time
Burn time

35
Q

What flares are good against kinematic rejection?

A

Forward firing aerodynamic flares

36
Q

Chaff response factors/characteristics/principles

A 
Length 
Bandwidth
Material
Orientation
Amount
37
Q

What is the reason for SEAD?

A

Attack enemy targets with a much reduced risk of loss

38
Q

What must a towed radar decoy do?

A

Act as a decoy for incoming missiles
Have a larger RCS for incoming missiles
Jam through deception or noise

39
Q

Examples of hardening

A

Sidelobe cancellation

High power aerial so enemy must use high power jammer

40
Q

EMCON examples

A

Frequency allocation
Parallel planning
Operating procedures

41
Q

Masking examples?

A

Transmit on several signals at once

Identical generator in transmit and receive

42
Q

Wartime reserve signal examples

A

Change parameters
Change polarisation
Have quick

43
Q

What makes you a target?

A 
Electronic things (radar etc)
Physical things (shape, size, aspect etc)
44
Q

Uses of lasers

A

LIRCM
Distance measuring
Laser beam riding

45
Q

What are the different types of missile warning systems?

A

Radar
IR
UV

46
Q

What is the purpose of a radar warning receiver?

A

To intercept and identify transmissions to alert the crew of a threat

47
Q

How does a MWS detect hostile missiles?

A 
Presence of mass and velocity
Muzzle flash
Motor ignition
Motor plumes
Heat produced
48
Q

What is the problem with laser warning sensors?

A

The designator (laser) is only on part of the target. Therefore, the LWR must be able to detect scattered energy as well as the main beam

49
Q

Identify what a pulse repetition interval is

A

The start of one pulse to start of next

50
Q

What is the pulse width (and identify)

A

Width of one pulse

51
Q

What is the maximum number you can have in a 4 digit octor SSR code?

A

7777

52
Q

How does a RWR get it’s direction

A

Phase difference

53
Q

What is a TRD?

A

Towed radio decoy

54
Q

What are the dangers to crew of lasers?

A

Blinding/dazzling

Eye damage

55
Q

Define electronic attack

A

Use of directed EM energy to attack personal, facilities or equipment with the intent of degrading, neutralizing or destroying enemy combat capability. Includes actions to prevent or reduce enemy’s effective use of EM spectrum

56
Q

Advantage and disadvantage of a high frequency radar

A

Advantage : greater discrimination

Disadvantage: shorter range

57
Q

What is the difference between SEAD and DEAD?

A

Suppress enemy air defense with a ‘soft kill’ disabling the enemies equipment without destroying it. DEAD, physically destroys the facility

58
Q

What is the difference between IRCM and DIRCM

A

IRCM - fires IR in all directions all the time with a low power/accuracy (3:1)

DIRCM - fires directed IR at the missile at a higher power/accuracy (15:1)

59
Q

What are the characteristics of MANPad, Beam riding, passive, active, semi active and track via missile systems.

A

I’m not writing all that out. Just make sure you know it all.

ISR EW (4 decks)

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