Fault tolerant multi-algorithmic attitude determination and control system for small satellites based on bayesian networks

Date

2023-8-22

Author

Yıldırım, Cansu

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The Attitude Determination and Control System (ADCS) in satellites uses different modes to estimate and control attitude during various mission phases. This subsystem is important subsystem for the small satellites allowing for addressing constraints specific to small spacecraft. This thesis presents an ADCS design for an Earth-observing small satellite, including different modes with controllers and estimators. Mode transitions are achieved using threshold values and a discrete state Markov Chain model, with Bellman optimization controlling the Markov chain. Additionally, a Fault Detection and Isolation (FDI) algorithm is proposed, utilizing a Bayesian Network (BN) constructed with expert knowledge. A simulation environment is created to evaluate the performance of the algorithms and modes.

Subject Keywords

Attitude determination and control system, Bayesian network, Discrete state markov chain

URI

https://hdl.handle.net/11511/105476

Collections

Graduate School of Natural and Applied Sciences, Thesis