Satellite Attitude Control Internal Structure

This internal block diagram shows the main parts inside a small imaging satellite and the connectors that matter at system level. Solar power reaches the power subsystem, which feeds the spacecraft data bus. The bus connects the attitude-control computer, imaging payload, radio and thermal control. The attitude-control loop is explicit: sun and star sensors plus the gyroscope provide measurements to the ADCS computer, and the computer commands the reaction wheels. Ground commands arrive through the radio, while the payload has both data-bus and thermal interfaces. Use it to discuss allocation of functions to parts before specifying detailed electrical connectors or software messages.