EW INTRO / RADAR

Question 1

What is the speed of light

Answer 1

162000nm/s
3x10^8m/s

Question 2

What are the three EW Actions

Answer 2

Electronic Attack
Electronic Defence
Electronic support

Question 3

What does ECM stand for?

Answer 3

Electronic counter measures

Question 4

What does EPM stand for?

Answer 4

Electronic protective measures

Question 5

What does ESM stand for?

Answer 5

Electronic support measures

Question 6

Electronic attack methods

Answer 6

Jamming
Deception
Neutralisation

Question 7

Electronic defence measures

Answer 7

Passive
Active
Emcon
Electronic masking

Question 8

Electronic support methods

Answer 8

ESM - external threat warning
SIGINT - ELINT + COMINT

Question 9

RWR

Answer 9

Radar warning receiver

Question 10

MWS

Answer 10

Missile warning system

Question 11

LWR

Answer 11

Laser warning receiver

Question 12

What does radar stand for

Answer 12

Radio detection and ranging

Question 13

Describe primary radar

Answer 13

Detect and locate a contact by means of reflected radio energy

Question 14

Wavelength equation

Answer 14

Wavelength = speed of light / frequency

Question 15

Define radar mile

Answer 15

Time taken for a pulse to travel to a target one mile away and return
1nm = 12.36 micro seconds

Question 16

Radar horizon

Answer 16

Effective radar range taking into account elevation and or terrain masking

1.23 x square root of antenna height

Question 17

What affects radar cross section

Answer 17

Size, shape, aspect, material, lumps bumps seams etc

Question 18

1 micro second =

Answer 18

1 x 10^-6 seconds

Question 19

What is PRF

Answer 19

Pulse repetition frequency

Question 20

Pulse length

Answer 20

Pulse width x speed of light

Question 21

What is MDR

Answer 21

Minimum detection range
Half pulse length

Question 22

Range resolution

Answer 22

Half pulse length

Question 23

Pulse repetition interval

Answer 23

Time period between start points of two pulses

Question 24

What is MUR

Answer 24

Maximum unambiguous range

1/2 speed of light / PRF

81000/PRF

Question 25

Scan types

Answer 25

Circular Sector Raster

Question 26

What is ARP

Answer 26

aerial rotation period Must be at a rate to receive all responses to a certain range, before moving on

Question 27

How is a radar displayed

Answer 27

Plan position indicator (PPI)

Question 28

Noise jamming

Answer 28

Random noise generated to clutter a radar to mask range and bearing if jamming vehicle.

Question 29

What is ‘burn through’

Answer 29

Point where the power of the hammer is overcome by the power of the radar and the jammers true position is seen.

Question 30

Frequency agility

Answer 30

Changing frequency to avoid jamming

Question 31

Three uses of EM spectrum

Answer 31

Radio Radar EO/IR

Question 32

Four elements of a radar

Answer 32

Frequency PRF Pulse width Scan type/ ARP