Why radar missiles lack IFF?

Machinery of War Discussion Aircraft
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I find it odd that the radar missiles in game and maybe in real life, lacks IFF capability. I understand if radar missiles are going on pitbull that they may lack the more powerful computing ability of the carrier aircraft.

But why aren’t they wired for IFF if given datalink with the carrier aircraft?

For example, we know that SARH principle that the carrier craft illustrates targets for the missile, then it chooses it’s own target.

Even in the game datalink is simulated.

How hard would it be to send bunch of XYZ coords to tell the missile not to go there?

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this is added with aim-120d
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Can’t wait for it to be missing like half the features on modern equipment.

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Same…

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The issue is more like the fact that DL just stops working when the missile goes terminal. As far as I am aware. This is incorrect behaviour.

The AMRAAM could be retargeted for example and I don’t believe that was confined to outside of it’s 22km? Active range…

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You’re talking about the electromagnetic world, about radars (including the head of actively guided missiles) are wave signals, this means that the accuracy you question is NOT based on coordinates (this would be the space world like GPS). IFF signals between aircraft and the Datalink are based on wave principles of the electromagnetic spectrum and therefore, actively guided missiles have (or had) the problem of time-speed-space for the correct wave identification of the target. In fact, I think there must be a function of electronic warfare that affects this principle (jamming the radar to confuse both the missile and the radar that guides it)