Drozd uses 24.5GHz Doppler radar to detect incoming rounds travelling between 70 and 700m/s (to avoid engaging small arms or other faster projectiles). Its computer determines when to fire a 107mm projectile. When the incoming round is at 7m range, the Drozd fragmentation warhead detonates, spreading 3-gram slugs to destroy the incoming round. The Drozd system was relatively complex, requiring a radar array and two launch tubes on each side of the tank turret, and a large electronics package on the turret rear.
One of Drozd's shortcomings was that it was only able to protect a 60-degree arc around the forward part of the turret. Each unit costs around $30,000, was 80 percent successful against incoming RPGs in Afghanistan, but proved to provide too high of a collateral damage issue to surrounding troops that were dismounted from their armored vehicles.
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