A UK research company developed this kind of microphone array tech in the 90s. It first came to fame in the Bosnian war and was used by UK peacekeeper troops to

A UK research company developed this kind of microphone array tech in the 90s. It first came to fame in the Bosnian war and was used by UK peacekeeper troops to enforce ceasefires. In that case it was most useful for detecting artillery fire and could instantly say what kind of weapon was fired, where it was, and when it fired. This could be used to instantly work out who broke the ceasefire, and peacekeepers could even fire back to destroy the rogue artillery piece and restore order.