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  2. Spacecraft attitude determination and control - Wikipedia

    en.wikipedia.org/wiki/Spacecraft_attitude...

    The second passive system orients the satellite along Earth's magnetic field thanks to a magnet. [7] These purely passive attitude control systems have limited pointing accuracy, because the spacecraft will oscillate around energy minima. This drawback is overcome by adding damper, which can be hysteretic materials or a viscous damper.

  3. Signal-flow graph - Wikipedia

    en.wikipedia.org/wiki/Signal-flow_graph

    "The signal flow graph is another visual tool for representing causal relationships between components of the system. It is a simplified version of a block diagram introduced by S.J. Mason as a cause-and-effect representation of linear systems." — Arthur G.O. Mutambara: Design and Analysis of Control Systems, p.238

  4. Satellite Control Network - Wikipedia

    en.wikipedia.org/wiki/Satellite_Control_Network

    The Satellite Control Network (SCN), operated by the United States Space Force's Space Delta 6, provides support for the operation, control, and maintenance of a variety of United States Department of Defense and some non-DoD satellites. This involves continual execution of Telemetry, Tracking, and Commanding (TT&C) operations.

  5. GPS signals - Wikipedia

    en.wikipedia.org/wiki/GPS_signals

    GPS signals are broadcast by Global Positioning System satellites to enable satellite navigation.Using these signals, receivers on or near the Earth's surface can determine Position, Velocity and Time (PVT) of the receiver.

  6. Noncommutative signal-flow graph - Wikipedia

    en.wikipedia.org/wiki/Noncommutative_signal-flow...

    A multi-input, multi-output system represented as a noncommutative matrix signal-flow graph. In automata theory and control theory, branches of mathematics, theoretical computer science and systems engineering, a noncommutative signal-flow graph is a tool for modeling [1] interconnected systems and state machines by mapping the edges of a directed graph to a ring or semiring.

  7. Guidance, navigation, and control - Wikipedia

    en.wikipedia.org/wiki/Guidance,_navigation,_and...

    GPS transmits 2 signal types: military and a commercial. The accuracy of the military signal is classified but can be assumed to be well under 0.5 meters. The GPS system space segment is composed of 24 to 32 satellites in medium Earth orbit at an altitude of approximately 20,200 km (12,600 mi).

  8. Control engineering - Wikipedia

    en.wikipedia.org/wiki/Control_engineering

    Control systems play a critical role in space flight.. Control engineering, also known as control systems engineering and, in some European countries, automation engineering, is an engineering discipline that deals with control systems, applying control theory to design equipment and systems with desired behaviors in control environments. [1]

  9. Control system - Wikipedia

    en.wikipedia.org/wiki/Control_system

    The definition of a closed loop control system according to the British Standards Institution is "a control system possessing monitoring feedback, the deviation signal formed as a result of this feedback being used to control the action of a final control element in such a way as to tend to reduce the deviation to zero." [2]