Distributed Secure State Estimation of Multi-Sensor Systems Subject to Two-Channel Hybrid Attacks

This paper focuses on the distributed secure state estimation problem, for a class of wireless networked multi-sensor systems, in a non-secure communication environment. The phenomenon of hybrid attacks in both the measurement information transmission channel and the local information transmission channel, is considered. By analyzing the hybrid occurrence of DoS attacks as well as false data injection attacks in these two channels, a novel switched distributed secure state estimation system which consists of nine subsystems is modeled. Based on the average dwell-time approach, sufficient conditions are derived such that the switched distributed secure state estimation error system is exponential stable and satisfies a desired disturbance/attack attenuation performance. Finally, an illustrative example is given to verify the effectiveness of the proposed distributed secure estimator design method.