Four, low-vibration reaction wheels, and three torque rods with redundant windings and drivers are used for control. The ACDS is designed to allow payload imaging more than 30 degrees from nadir, rapid slewing, tracking of targets, and to minimize vibrations and induced jitter. The subsystem also contains redundant GPS receivers and antennas to allow precision orbit determination, timing and geolocation. The propulsion subsystem uses a single 44.1 cm tank to store up to 33 kg of hydrazine. A larger tank configuration is available that provides up to 78 kg of hydrazine using a 56.2 cm tank.
Thermal control is primarily passive, supplemented with reliable heater controllers.
Payload deck thermal isolation is provided through titanium isolators at the three kinematic mounting points. Specifications are subject to change without notice.