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Attitude and deformation coupled estimation of flexible satellite using low-cost sensors

Ghani, M ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.asr.2021.08.010
  3. Publisher: Elsevier Ltd , 2022
  4. Abstract:
  5. Solar panel flexibility plays an important role in the attitude control of satellites. Therefore, traditionally the deformations of flexible solar panels are measured with a series of sensors along the panels itself. This paper presents a novel maiden attempt to simultaneously estimate the attitude and deformation of a flexible satellite using only 2 low-cost attitude sensors namely the sun sensor and magnetometer measurements. The flexible satellite is considered as a central rigid body with two attached flexible panels in order to derive the governing dynamic equations based on the Lagrange's equation. Both Extended Kalman filter (EKF) and Unscented Kalman Filter (UKF) are employed for the purpose of simultaneous attitude and deformation estimations. By performing a comparison between EKF and UKF through a Monte-Carlo simulation, UKF shows less sensitivity during eclipse. However, its computational time is much more than that of EKF. The numerical results also demonstrate that including the flexibility model in the developed estimation equations enables the algorithm to successfully estimate the deformation at any solar panel location without the need for any conventional sensor that directly measures the strain and/or deformation. © 2021 COSPAR
  6. Keywords:
  7. Extended Kalman filter ; Flexible satellite ; Attitude control ; Cost benefit analysis ; Cost estimating ; Deformation ; Intelligent systems ; Monte Carlo methods ; Satellites ; Solar cell arrays ; Solar concentrators ; State estimation ; Attitude estimation ; Attitude sensors ; Flexible satellites ; Flexible solar panels ; Low-cost sensors ; Low-costs ; Rigid body ; Solar panels ; Sun sensor ; Unscented Kalman Filter ; Extended Kalman filters
  8. Source: Advances in Space Research ; Volume 69, Issue 1 , 2022 , Pages 677-689 ; 02731177 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0273117721006608