10.a. IFF

Question 1

What are the IFF frequencies?

Answer 1

Question 2

Purpose of Transponder:

Answer 2

Provides self identification reply

Question 3

Purpose of IFF Interrogators

Answer 3

Perform IFF interrogation and target processing

Question 4

IFF M/ISC purpose

Answer 4

Controls the transponders
Network logging
Connected to CMS

Question 5

How does IFF determine which mode is being used?

Answer 5

The interrogation signal consists of two 0.8 microsecond pulses. The time interval between the interrogation pulses determines the interrogation mode.

Question 6

How is information stored in the interrogation?

Answer 6

There are Framing Pulses and within those are Information Pulses.

The Information Pulses represent bits.

Question 7

What are IFF Fruits?

What issues can this cause?

How do we eliminate it?

Answer 7

Replies from contacts that were generated in response to another unit’s interrogations.

Can clutter up the reply of interest.

Eliminated by Defruiting.

Question 8

What is Black IFF?

Answer 8

Antenna is rotating and providing pre-trigger signal but not transmitting. Would be for EMCON.

Here the antenna will continue to rotate even though the radar is not radiating. It must rotate IOT operate the IFF interrogators.