Attitude Determination and Control Subsystem

The articles in this segment of the Satellite 101 Wiki have been contributed by Sumit Agrawal, Sanket Chirame, Anant Joshi, Ravit Anand, Ram Milan Verma, Sukanya Kudva, Keshav Janyani, Eashan Gupta and Charit Verma, all of whom are a part of the Attitude Determination and Control Subsystem of Advitiy, IIT Bombay's 2nd Student Satellite

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The Attitude Determination and Control Subsystem (ADCS) is very essential for stabilizing the satellite in orbit and ensuring that it points in the direction it is supposed to point in. For a systematic understanding the functions and various components of ADCS, we have organized the contents in a systematic manner as shown below:

• Introduction to ADCS
  • What is Attitude?
  • What is Control?
  • What is a frame?
    • Earth Centered Inertial Frame (ECIF)
    • Earth Centered Earth Fixed (ECEF) Frame
    • Orbital Frame
    • Body Frame
  • Equations of Rigid Body Rotational and Translational Dynamics
  • Requirements on ADCS by other Subsystems
  • Requirements by ADCS on other Subsystems
• Components of ADCS
  • Sensors and Estimators
    • What is Estimation? Estimate What?
    • Euler Angles
    • Quaternions
    • Triad Algorithm
    • Q Method and Wahba's Problem
    • QuEST
    • Least Squares Estimation
  • Actuators
    • Magnetorquers
    • Reaction Wheels
  • Control Law
    • Flow Chart of a Control System
    • B Dot Law
  • Propagation
    • Orbit Propagator
    • Determination of Sun Vector using Sunsensors
    • International Geomagnetic Reference Field (IGRF)
    • Modeling of Sensors in Simulink
  • On Ground Simulations
    • On-board In-Loop Simulations (OILS)
    • Hardware In-Loop Simulations (HILS)

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