The Arena active protection system is a Russian tanker's answer to rocket-propelled grenades and anti-tank missiles.
Unlike reactive armor which neutralizes impacts with an outward blast of its own, the Arena system aims to avoid impacts altogether by intercepting incoming threats with projectiles. It's also more technical in that it uses a multi-function Doppler radar and digital computer scans that arc around the tank like an invisible forcefield. Its computer system has a reaction time of 0.05 seconds and protects most of the tank except for the area behind the turret.
Here's the step-by-step explanation of how the system works:
The Arena active protection system forms an invisible protection barrier around the perimeter of the tank.
Watch the Arena active protection system test video: