How do IFF modes function in defense?

How do IFF modes function in defense?

• A. IFF transponder replies provide a weather identity; defense systems classify storms.
• B. IFF modes are used to jam enemy radars.
• C. IFF transponder replies provide a coded identity; defense systems compare radar tracks with IFF data to classify targets.
• D. IFF is used to calibrate radar frequency.

Answer: (C)

IFF modes function by having a transponder on a friendly aircraft or unit reply with a coded identity when interrogated by defense radar. Defense systems then compare that transponder response to the observed radar track to decide if the target is friend, foe, or unknown. This cross-check is what makes identification reliable in real time, reducing the chance of misidentifying a target and enabling automatic classification during complex engagements. Different modes provide varying levels of identification and security, from basic to encrypted, to prevent spoofing. The other choices don’t fit because weather identities, radar jamming, or radar calibration are not what IFF modes are designed to do.

IFF modes function by having a transponder on a friendly aircraft or unit reply with a coded identity when interrogated by defense radar. Defense systems then compare that transponder response to the observed radar track to decide if the target is friend, foe, or unknown. This cross-check is what makes identification reliable in real time, reducing the chance of misidentifying a target and enabling automatic classification during complex engagements. Different modes provide varying levels of identification and security, from basic to encrypted, to prevent spoofing. The other choices don’t fit because weather identities, radar jamming, or radar calibration are not what IFF modes are designed to do.