Dynamic Memory-Event-Based Privacy-Preserving Security Control for Networked Systems with Sensor Saturation Using a Memory State Observer

This paper addresses privacy-preserving-based control issue for discrete-time networked control systems (NCSS) with sensor saturation via a dynamic memory-assisted event-triggered mechanism (DMAETM) and a memory state observer. A DMAETM is introduced to conserve the constrained network resources and mitigate network congestion by utilizing a dynamic threshold, with the triggered condition based on historical transmission packets. To prevent potential privacy leaks, the RSA encryption-decryption algorithm is implemented to secure the transmitted data. This asymmetric encryption method relies on the computational difficulty of large prime factorization, using a public and private key pair. Afterwards, sufficient condition for ensuring the asymptotic stability of the augmented closed-loop system is established and the corresponding gain parameters are calculated by linear matrix inequality (LMI). Lastly, a numeric example is presented to verify the proposed control strategy.