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Satellite Attitude Control – Inner/Outer Loop Architecture

Designed a satellite attitude controller using an inner–outer loop control architecture implemented in MATLAB, Simulink, and Simscape. The controller employs quaternion-based attitude representation, a proportional inner loop, and a lead–integral outer loop to achieve robust tracking and disturbance rejection.

Control Architecture

  • Inner loop: proportional control for angular rate stabilization
  • Outer loop: proportional + lead + integral compensation for attitude tracking
  • Quaternion-based error formulation
  • 0.01 s actuator delay modeled using 8th-order Padé approximation

Design Requirements

  • Phase margin ≥ 60°
  • Gain margin ≥ 6 dB
  • Fast rise time with minimal overshoot
  • Robust disturbance rejection

Validation

  • Step, ramp, and sine attitude commands
  • Step and sinusoidal disturbance torques
  • Frequency-domain validation using Bode plots
  • Time-domain validation using stepinfo metrics

Repo Structure

  • matlab/ – controller design and analysis scripts
  • simulink/ – nonlinear Simulink/Simscape model
  • docs/ – detailed project report
  • results/figures/ – plots and results

Tools & Skills

MATLAB • Simulink • Simscape • Control Systems • Spacecraft GNC • Quaternion Control