1. Protective siloes
2. Radar
3. Protective ammo
4. Incoming anti-tank guided missile
5. Tracking phase
An active protection system (APS) is a system designed to actively prevent certain anti-tank weapons from destroying a vehicle.
Countermeasures that either conceal the vehicle from, or disrupt the guidance of an incoming guided missile threat are designated soft-kill active protection measures.
Countermeasures that physically strike an incoming threat to damage or destroy it and thereby limit its ability to penetrate armor are designated hard-kill active protection measures.