On-Orbit Identification of Unstable Micro-Propulsion System Parameters Using Drag-Free Control

Space gravitational wave detection spacecraft is equipped with a drag-free control and micro-propulsion system, and adopts thrust closed-loop feedback control structure. An on-orbit high accuracy estimation algorithm of micro-thruster parameters based on drag-free control model is proposed in this p...

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Published in:Data Driven Control and Learning Systems Conference (Online) pp. 1935 - 1940
Main Authors: Xu, Nuo, Xia, Xiwang, Li, Zhaoxiong, He, Xiongfeng, Guo, Ning, Wang, Pengcheng, Zhang, Yonghe
Format: Conference Proceeding
Language:English
Published: IEEE 17.05.2024
Subjects:
Accuracy
Attitude control
Drag-free Control
Fading channels
Gravitational Waves
Heuristic algorithms
Micro-propulsion
Recursive Least Square
Simulation
Space vehicles
Thrust Identification
Torque
ISSN:2767-9861
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Abstract Space gravitational wave detection spacecraft is equipped with a drag-free control and micro-propulsion system, and adopts thrust closed-loop feedback control structure. An on-orbit high accuracy estimation algorithm of micro-thruster parameters based on drag-free control model is proposed in this paper in order to deal with the problem of unsteady nominal thrust caused by thruster failure or aging and and extend thrusters lifespan. In this method, the recursive gain and covariance are designed to estimate the parameter matrix of system. Adaptive forgetting factors are added to the covariance matrix for designing a fading memory window to determine the influence of prior data on the results. At the same time, the thruster state is deconstructed into three parts: thrust gain, thrust direction and lever arm to facilitate the redistribution of control force and torque. Simulations show that the on-orbit thrust identification errors of the proposed method in different micro-propulsion states are all at sub-micro-newton level, and the noise is less than 0.1\mu N/\sqrt{Hz} which has capability to meet the requirements corresponding to drag-free control system.
AbstractList Space gravitational wave detection spacecraft is equipped with a drag-free control and micro-propulsion system, and adopts thrust closed-loop feedback control structure. An on-orbit high accuracy estimation algorithm of micro-thruster parameters based on drag-free control model is proposed in this paper in order to deal with the problem of unsteady nominal thrust caused by thruster failure or aging and and extend thrusters lifespan. In this method, the recursive gain and covariance are designed to estimate the parameter matrix of system. Adaptive forgetting factors are added to the covariance matrix for designing a fading memory window to determine the influence of prior data on the results. At the same time, the thruster state is deconstructed into three parts: thrust gain, thrust direction and lever arm to facilitate the redistribution of control force and torque. Simulations show that the on-orbit thrust identification errors of the proposed method in different micro-propulsion states are all at sub-micro-newton level, and the noise is less than 0.1\mu N/\sqrt{Hz} which has capability to meet the requirements corresponding to drag-free control system.
Author Xu, Nuo
Li, Zhaoxiong
Xia, Xiwang
Zhang, Yonghe
He, Xiongfeng
Guo, Ning
Wang, Pengcheng
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  givenname: Xiwang
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  organization: Chinese Academy of Sciences,Innovation Academy for Microsatellites,Shanghai,P. R. China,201203
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  givenname: Yonghe
  surname: Zhang
  fullname: Zhang, Yonghe
  organization: Chinese Academy of Sciences,Innovation Academy for Microsatellites,Shanghai,P. R. China,201203
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Snippet Space gravitational wave detection spacecraft is equipped with a drag-free control and micro-propulsion system, and adopts thrust closed-loop feedback control...
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StartPage 1935
SubjectTerms Accuracy
Attitude control
Drag-free Control
Fading channels
Gravitational Waves
Heuristic algorithms
Micro-propulsion
Recursive Least Square
Simulation
Space vehicles
Thrust Identification
Torque
Title On-Orbit Identification of Unstable Micro-Propulsion System Parameters Using Drag-Free Control
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