Cardan-class space station

An Imperial Space Station is an orbital defence structure, built over a planet to defend it from attack by rebels. The hanger can deploy a squad of tie fighters for additional defence. A level one space station is very weak, and thus, is easily taken out by a rebel fleet. However, a level five space station is a fearsome sight, and requires a large rebel fleet to take out. Standard defenses on Imperial space stations are:

Ion cannons, Proton Torpedoe Launchers, Concussion Missile Launchers, Turbolaser Batteries, Laser Batteries,

A Space Station comes equipped witha shield generator, and hanger, for additional defenses.

Sources

Star Wars: Empire At War