hey i originally posted something else in reply which i felt was insulting and demeaning. so i took it down.There are fire and forget missiles. These missiles have on-board seekers (IRST) which home in on targets. US's much acclaimed anti-ship Harpoon is one such. Back home we have Nag anti-tank missile with own guidance. Pilot intervention of fire-&-forget missile is possible upto some distance ( See 'Know your Rafale' thread, May 22,my discussion with @Zebra) which is called re-targetting.
i just want to say that you're mixing up 2 different concepts-
Infrared homing guidance system Vs Infra-red search and track (IRST)
read up about them on wikipedia and clear up your basic concepts.
hint: IRST are pods mounted on aircrafts just above the nose radome. they cannot be mounted on missiles. they are passive sensors not guidance systems.
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