Qualitative/quantitative hybrid fault diagnosis method based on case-based reasoning and parity space

Because of the special characteristics of spacecraft attitude control system that its precision model is not available and the knowledge-based method is not effective for it, adopting qualitative/quantitative hybrid fault diagnosis and combining the case-based reasoning method with parity space, the qualitative/quantitative hybrid fault diagnosis method based on case-based reasoning and parity space is proposed in this paper. The method is based on building a qualitative/quantitative hybrid fault diagnosis model. The spacecraft attitude control system is taken as an illustrative example, and the result shows that the proposed qualitative/quantitative hybrid fault diagnosis method is more effective than each individual method.