Book 5

Question 1

Explain modules of the block diagram of IFF

Answer 1

Question 2

Complete the diagram of mode pulse spacing

Answer 2

Question 3

What does mode 5 level 1 provide

Answer 3

Basic ID

Height data

Question 4

What are the emergency codes

Answer 4

Emergency = 7700

Radio failure = 7600

Hijack = 7500

Question 5

Describe the purpose of a P2 pulse

Answer 5

Allows the system to decide if the interrogation is from the main lobe

If P2 is smaller than P1 and P3 then you are in the main beam.
If P2 is bigger then you are in the side lobes and transponder is suppressed.

Question 6

Describe mode 5 wake up pulse

Answer 6

Question 7

Mode 5 benefits

Answer 7

Resistant to spoofing

Improved anti-jamming

Reduced aircrew workload

Reduced likelihood of blue on blue incident

Question 8

What does mode 5 level 2 provide

Answer 8

Reports containing data

Encrypted GPS position

This can be triggered by interrogation or sent directly

Question 9

State 3 advantages of thermal imaging IR sensors

Answer 9

Passive and undetectable

Independent of natural or artificial light

Not easily deceived by camo

Question 10

Explain what is meant by confused jamming and deception jamming

Answer 10

Confusion jamming presents random returns on enemy radar displays

Deception jamming presents a false target on enemy radar displays

Question 11

Disadvantages of FLIR

Answer 11

Atmospheric attenuation

Poor quality image

True size may not be displayed

Sensor head very expensive

Thermal shadows

Question 12

Why is conventional glass not used for IR optics

Answer 12

Conventional glass is opaque to IR waveslenthgs greater than 3Micrometres, so special materials must be used for lenses/windows

Question 13

Block diagram for FLIR

Answer 13