Radar lock on missile

IRL, can radar lock on enemy air to air missiles?

If they are big enough and turned in a way that they generate enough of a radar signature, yes, yes indeed.
You can even see that in game, for example I’ve shot down phoenixes with my own radar missiles and saved myself that way, so it that defo works

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I’m curious that whether, irl, these air to air missile radar cross sections are large enough.

Radar can see missiles. Despite being small, they are generally very roundy (for aerodynamical stability purpose), thus they are quite good at reflecting waves. In addition to that, missiles are way faster than planes, making their doppler signature is quite unique as well.

If you think about, chaff used as decoy for radars are even smaller than missiles.