My Mrs was working for a defence company here that produces ballistic detection devices for afv/apc's
Basically it gives you an exact angle and attempts to trace back a trajectory on any incoming (rather than tracing the vehicle's fired munitions).
Pretty neat device to have: if you survive the incoming you get a lock on the firer.
Dunno how successful this equipment was - judging by the chief engineer's drinking habits it's prolly still in alpha phase.
A number of countries, (most notably Russia), have developed or deployed these type of systems, (primarily for use against the larger and slower explosive anti-tank munitions).
They typically use short range radar to track and intercept incoming missile near the vehicle. I would image that in actual use on a conventional battlefield against a modern opponent, the systems would experience some loss of efficiency due to the use of electronic counter-measures and the requirement of the systems to radiate.
I
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