I don't think this would even be... possible. You would need to get a functional radar and then interpret it into some form of system that would turn a turret so it aligned with its target, and knew when to shoot. I'm sure at some point somebody is going to try it but even if it did work, the amount of space it would need, and the bricks for the sensors, actuators, etc..

You are probably going to need a logic brick and even likely some implementation of lua or similar so you can do branch and loop decision making.

Radar would be possible to make, however it would be STUPID tedious and would require somebody who has actually worked on a C-RAM system before.

I.e. rocket science

I have radar guided missiles.
I also already have made (sort of) an ai radar AA weapon. But the "Radar" system just locks onto the target. Also radar is decently simple when you know how to do it the way I do