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Summary

This study introduces an extended high gain observer (EHGO) for estimating spacecraft angular rates using gyrowheels (GWs). The method accurately estimates rates even with large rotor angles and sensor noise.

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Lyapunov stabilityangular rates estimationextended high gain observergyrowheelmeasurement noisetorque output

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Area of Science:

  • Aerospace Engineering
  • Control Systems
  • Robotics

Background:

  • Gyrowheels (GWs) function as actuators and sensors in spacecraft attitude control systems (ACS).
  • Accurate estimation of spacecraft angular rates is crucial for effective attitude control.

Purpose of the Study:

  • To develop a method for estimating two-dimensional spacecraft angular rates using a gyrowheel (GW) that outputs three-dimensional control torque.
  • To implement an extended high gain observer (EHGO) for angular rate estimation when the GW rotor operates at large angles.

Main Methods:

  • Derived the gyrowheel (GW) dynamic equation using the second kind Lagrange method.
  • Designed an extended high gain observer (EHGO) for spacecraft angular rate estimation.
  • Proved the stability of the EHGO using the Lyapunov function.
  • Analyzed the impact of measurement noise on estimation accuracy.

Main Results:

  • Successfully estimated spacecraft angular rates using the GW and EHGO, even with large rotor angles.
  • Demonstrated the robustness of the EHGO against measurement noise in tilt angle sensors.
  • Validated the proposed method through numerical simulations.

Conclusions:

  • The proposed EHGO method effectively estimates spacecraft angular rates using GWs, addressing challenges with large rotor angles and sensor noise.
  • This approach enhances the capability of GWs as simultaneous actuators and sensors in ACS.