A resilient data aggregation method based on spatio-temporal correlation for wireless sensor networks

In wireless sensor networks, the existing data aggregation algorithms usually cannot evaluate the extent of data damage in presence of additive attacks. To resolve such problem, a resilient data aggregation method based on spatio-temporal correlation for wireless sensor networks is presented in this paper. On the basis of the distributed data convergence model, the algorithm combines the centroid distance and similarity to measure the attack degree of each cluster node's perceived data, and the weighted calculation can improve the convergence precision of data recovery. In addition, this method can obtain the estimated value of data sample of all clusters according to the temporal correlation characteristic of the nodes' perceived data at different time. Using the chi-square fitting, the extent of the data being tampered in each cluster can be measured effectively. Theoretical analysis and simulation results show our method can improve the restoration convergence precision as the attack increment is small. Also, it can enhance the robustness from noise interference.