ZSU "Shilka" - Russian built, self propelled anti-aircraft unit. 4 x 23mm autocannons aimed via the "Gun Dish" radar or can be optically aimed. The rounds are stored in the four hoppers
ZSU-23-4 "Shilka", self-propelled, radar guided anti-aircraft weapon system - YouTube
1962 ZSU-23-4 Shilka Anti-Aircraft Radar System on Behance
All you need to know about Nigeria's ZSU-23-4 Shilka System. – DefenseNigeria