Study on fault diagnosis algorithm in WSN nodes based on RPCA model and SVDD for multi-class classification

For characteristics of the wireless sensor network (WSN) nodes data streaming in the application environment, the limitations of conventional principal component analysis (PCA) method which depend on the static model in practical application are discussed, an online fault diagnosis algorithm in WSN nodes based on recursive PCA (RPCA) model and support vector data description (SVDD) for multi-class classification is proposed in this paper. The main contents of the method include:The algorithm first applies recursive eigenvalue decomposition techniques based on first-order perturbation (FOP) analysis to update the PCA model adaptively and realize the online fault detection, and then uses SVDD based multi-class classification algorithm to diagnose the fault types. Experimental results show that the algorithm can satisfy the real time needs of data stream processing, but also can track the data changes well. The experimental results based on data sets in real field and experimental data off our typical node failures demonstrate the effectiveness of the proposed algorithm. The algorithm proposed in this paper would improve the safety factor of monitoring sites and it can allows us to know the working state of the node in time and repair or replace it at first time.