What is the primary role of the Attitude Determination and Control System (ADCS)?

What is the primary role of the Attitude Determination and Control System (ADCS)?

• A. To regulate thermal conditions.
• B. To determine spacecraft orientation and adjust its attitude using sensors and actuators.
• C. To manage data storage.
• D. To control propulsion for orbit changes.

Answer: (B)

Attitude determination and control is about figuring out which way the spacecraft is pointing and then steering it to the desired orientation using information from sensors and torques from actuators. The ADCS blends data from sensors such as star trackers, sun sensors, gyroscopes, and magnetometers to determine the spacecraft’s exact attitude. It then commands actuators like reaction wheels, control moment gyros, magnetic torquers, or thrusters to apply the needed torque and adjust the attitude. This keeps critical surfaces—like solar panels facing the Sun and antennas toward Earth—properly oriented for power generation and communications. Other systems handle thermal management, data storage, or propulsion for changing orbits, but the ADCS is specifically responsible for determining orientation and actively maintaining or changing the spacecraft’s attitude.