NETWORKED STATE ESTIMATION OVER LOSSY COMMUNICATION CHANNELS WITH DATA RATE LIMITATION

Chunqiang Chen,∗,∗∗ Weiming Tang,∗ Qingquan Liu,∗∗∗,∗∗∗∗ and Zhihui Dang∗∗∗

Keywords

Networked control systems, state estimation, data rate limitation,packet dropout, observability

Abstract

This paper deals with the state estimation problem for networked control systems. In general, data packets on plant states are transmitted over a lossy communication channel. More precisely, the system in our modelling framework is subject to both data packet dropout and data rate limitation in such a channel. To deal with the state estimation problem, we employ the differential quantization method and give a new quantization coding scheme for such systems and derive that encoders and estimators can work synchronously on the basis of the scheme. Furthermore, we further derive sufficient conditions for observability in this case. We present an illustrative example to state the effectiveness of the proposed scheme.

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