Fixed-Time Secure State Estimation for Cyber-Physical Systems With Multi-Channel Transmission Under DoS Attacks

This brief investigates the problem of secure state estimation (SSE) for cyber-physical systems (CPSs) which communicate through multiple channels under denial of service (DoS) attacks, where the considered DoS attacks occur aperiodically and independently in all channels. The only limitation for DoS attacks is that the duration of each attack is bounded. First, a secure transmission strategy is given to transmit signals and resist DoS attacks. Then, a novel fixed-time secure state estimation (FTSSE) method is proposed to ensure that the SSE for CPSs is realized within a predetermined fixed-time based on the developed secure transmission strategy. In addition, the accurate state values of some moments can be obtained at a given delay time. The sufficient condition and the proof of effectiveness for the FTSSE method based on secure transmission strategy are given through theoretical analysis. Finally, the results of an example simulation are given to verify the effectiveness of the designed method.