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EW Advanced Theory > Week 1 Theory > Flashcards

Week 1 Theory Flashcards

1
Q

Speed of light

A

3x108 m/s
162,000 nm/s
182,000 miles/s

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2
Q

Three parts of EW

A

Attack
Support
Protection

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3
Q

Divisions of Electronic Attack

A

Jamming
Deception
Neutralisation

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4
Q

Divisions of Electronic Support

A

Warning

SIGINT

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5
Q

Divisions of Electronic Protection

A

EMCON
Masking
Hardening
Wartime Reserve Modes

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6
Q

Types of Polarisation

A

Random
Linear
Circular

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7
Q

What is Isotropic distrubution

A

EM energy propagating equally in all directions

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8
Q

What is attenuation caused by?

A

Absorption or scattering

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9
Q

What is diffraction

A

Bending of waves around edges of objects

Lower wavelength=greater diffraction

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10
Q

What is Reflection

A

A waves angle of incidence is equal to its angle of reflection

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11
Q

What is refraction

A

Speed of a wave varies as it goes through a medium

Waves are bent towards the earth

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12
Q

What are the wave types

A

Ground wave (surface and space)

Skywave

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13
Q

What are the two transmitter types

A

Oscillator

Amplifier

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14
Q

What are the 3 transmitter devices

A

Magnetron
Travelling Wave Tube
Field Effect Transistor

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15
Q

What parts of a wave can be modulated?

A

Amplitude
Frequency
Phase

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16
Q

Parts of a Transmitter

A

Synchroniser-modulator-transmitter

Duplexer-antenna

Display-receiver

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17
Q

What does Frequency affect

A

Range-attenuation

Antenna size

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18
Q

What does PRF affect

A

Date rate

MUR

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19
Q

What does pulse width affect

A

Average power

Minimum detection range(MDR)

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20
Q

Power

A

Range

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21
Q

What does Beam width affect

A

Angular discrimination
Beamshape
Freq

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22
Q

What does ARP affect

A

Max detection range, data rate

23
Q

3 types of Radar display

A

Plan position Indicator
B scope
A scope

24
Q

What should a receiver do?

A

Intercept
Process
Identify
Display

25
Q

Parts of a reciver

A

Display—processor—receiver—amplifier—antenna

DOA (direction of arrival) resolver

26
Q

What is Signal to noise Ratio

A

Unit less value resulting from a specified signal being divided by a corresponding noise signal

27
Q

What is Bandwidth

A

Difference between the upper and lower frequencies of a signal

28
Q

Sources of external noise

A

Interference
Ground
Weather
Jamming

29
Q

Sources of Internal noise

A

Equipment noise, transmission noise, antenna noise

30
Q

Scan Types

A

Circular
Sector
Raster
Complex

31
Q

Antenna components

A

Feed
Reflector
Transmitting medium (waveguide, coaxial cable)

32
Q

What is a cosecant squared beam

A

Reflector shaped so there is more gain at longer range which means long range targets have the same intensity as close range
Maritime surveillance

33
Q

What is tapered illumination?

A

Reduces sidelobes to put more energy down the main beam

34
Q

Two types of feed

A

Circular-pencil beam

Rectangular-fan beam

35
Q

What does a cassegrain radar do

A

Has a reflector that changes the polarisation of the radio wave to eliminate a null in the centre of the radar

36
Q

What is gain

A

A measure of an antennas efficiency to focus a beam in a certain direction

37
Q

Two types of electronically scanned arrays

A

Passive -one transmitter feeding multiple antennas

Active-multiple tx and rx

38
Q

Types of beam steering

A

Frequency

Phase

39
Q

What does DOA stand for

A

Direction of arrival

40
Q

4 parts of an elipse

A

Major axis
Minor axis
Orientation (bearing from north)
Center point

41
Q

Ways to measure DOA

A

Directional antenna scanning -360°
Amplitude comparison
Phase comparison

42
Q

A band

A

0.03-0.25

43
Q

B band

A

0.25-0.5

44
Q

C band

A

0.5-1

45
Q

D band

A

1-2

46
Q

E band

A

2-3

47
Q

F band

A

3-4

48
Q

G band

A

4-6

49
Q

H band

A

6-8

50
Q

I band

A

8-10

51
Q

J band

A

10-20

52
Q

K band

A

20-40

53
Q

L band

A

40-60

54
Q

M band

A

60-100

EW Advanced Theory (3 decks)

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