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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
What are the characteristics of radar missile warning receiver?
Accurate range detection Short range Overt
26
What are the characteristics of UV Missile warning system?
Operates on solar blind Low false returns Short range as attenuated by atmosphere/ozone
27
What are the requirements for a missile warning receiver?
``` Spherical coverage Long range Accurate Low false returns Speed Threat lethality assessment High probably of detection ```
28
How do you defend against lasers?
``` Absorb Reflect Ablation (dissipate) Eye protection Jamming ```
29
What are the three consecutive actions of a missile warning system? (Threat warning sequence)
Locate Track Declare
30
What are the 4 principles of COMSEC?
Physical Personnel Transmitting Crypto
31
What are the components of a missile?
``` Motor 1st stage booster Data link War head Guidance computer/control Sensor ```
32
What are the phases of missile launch?
Launch (boost) Mid course (sustain) Terminal (coast)
33
What is the missile guidance loop?
Sensor Error Guidance computer Steering
34
What are the principles of flares?
Peak intensity Rise time Burn time
35
What flares are good against kinematic rejection?
Forward firing aerodynamic flares
36
Chaff response factors/characteristics/principles
``` Length Bandwidth Material Orientation Amount ```
37
What is the reason for SEAD?
Attack enemy targets with a much reduced risk of loss
38
What must a towed radar decoy do?
Act as a decoy for incoming missiles Have a larger RCS for incoming missiles Jam through deception or noise
39
Examples of hardening
Sidelobe cancellation | High power aerial so enemy must use high power jammer
40
EMCON examples
Frequency allocation Parallel planning Operating procedures
41
Masking examples?
Transmit on several signals at once | Identical generator in transmit and receive
42
Wartime reserve signal examples
Change parameters Change polarisation Have quick
43
What makes you a target?
``` Electronic things (radar etc) Physical things (shape, size, aspect etc) ```
44
Uses of lasers
LIRCM Distance measuring Laser beam riding
45
What are the different types of missile warning systems?
Radar IR UV
46
What is the purpose of a radar warning receiver?
To intercept and identify transmissions to alert the crew of a threat
47
How does a MWS detect hostile missiles?
``` Presence of mass and velocity Muzzle flash Motor ignition Motor plumes Heat produced ```
48
What is the problem with laser warning sensors?
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
Identify what a pulse repetition interval is
The start of one pulse to start of next
50
What is the pulse width (and identify)
Width of one pulse
51
What is the maximum number you can have in a 4 digit octor SSR code?
7777
52
How does a RWR get it's direction
Phase difference
53
What is a TRD?
Towed radio decoy
54
What are the dangers to crew of lasers?
Blinding/dazzling | Eye damage
55
Define electronic attack
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
Advantage and disadvantage of a high frequency radar
Advantage : greater discrimination | Disadvantage: shorter range
57
What is the difference between SEAD and DEAD?
Suppress enemy air defense with a 'soft kill' disabling the enemies equipment without destroying it. DEAD, physically destroys the facility
58
What is the difference between IRCM and DIRCM
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
What are the characteristics of MANPad, Beam riding, passive, active, semi active and track via missile systems.
I'm not writing all that out. Just make sure you know it all.

ISR EW (4 decks)

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