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Identification of Reaction Wheel Disturbance and its impact on Attitude Determination Enhancement for Satellites with Magnetometer Sensors

Ahangar Parvin, Mohammad Mahdi | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57391 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Pourtakdoust, Hossein
  7. Abstract:
  8. The attitude determination (AD) and control system (ADCS) tasks in an operational satellite includes attitude determination, stabilization and pointing against internal and external disturbance moments. Where these tasks are carried out using several sensors, actuators as well as some pertinent attitude determination algorithms. In this sense, the magnetometer (MAG) sensor is among the most common sensors used to attitude estimation that can be utilized in association of reaction wheels (RWs) as a reliable and efficient actuation mechanism for a three-axis attitude control satellite. Unfortunately, RWs generate magnetic field disturbances during operation as commanded by ADCS that adversely interacts with the magnetometers. The latter will inevitably cause MAGs errors that in turn affect the accuracy of the satellite AD process. Most effective AD algorithms utilize the noise-polluted sensors output for attitude estimation via a filtering approach. The present research attends to the magnetic disturbance of RWs, which is beyond the range of the MAGs noisy output range, in order to analyze, model and quantify the mentioned disturbances effect on AD process and its enhancement for satellites equipped with MAG sensors. In addition, via utility of experimental data emanating out of magnetic interaction between RWs and MAGs, it is demonstrated that proposed magnetic field interferences degrades the AD estimation accuracy. Finally, a method to remove the perceived interference magnetic effect is suggested for improved AD estimation accuracy
  9. Keywords:
  10. Reaction Wheel (RW) ; Magnetometer ; Attitude Determination ; Magnetic Sensor ; Divert and Attitude Control System (DACS) ; Satellite Attitude Control ; Disturbance Identification

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