How does the SAM (surface to air missile) not fire on friendly aircraft and only on enemy aircraft?
In: Technology
Identify Friend or Foe (IFF) transponder. The IFF responds to a query sent by a the targeting station (either automatically or manually by an operator). The query is encrypted, and the IFF decrypts the signal, processes it, and sends an appropriate response, which is also encrypted.
If the IFF successfully decrypts and reads the signal, it knows the aircraft is being pinged by a friendly system and doesn’t sound an alarm in the cockpit. If the ground station successfully decrypts the response, it knows the aircraft is friendly and not to blow it’s bitch ass out of the sky.
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