无线传感器网络中基于事件触发的分布式滤波

摘要

The problem of distributed H∞ filtering for a class of discrete systems with random packet drop under an event-triggered communication mechanism is studied.Event-triggered communication mechanism is introduced to reduce burden of communication and energy consumption of wireless sensor network,the sensor broadcasts its measurements to the neighboring nodes only when the certain trigger condition is satisfied.A filtering error system model is established to account for both the event-triggering condition and data dropout in a unified framework.A performance criterion for distributed H∞ filtering and a design method of filtering parameters under the event-triggered communication scheme are given in terms of linear matrix inequalities.Finally,a numerical example is given to illustrate the effectiveness of the proposed design scheme.%研究了具有随机丢包特征和事件触发通讯机制的无线传感器网络下离散线性系统的分布式H∞滤波问题.采用独立的伯努利分布刻画传感器节点通讯的数据丢包,事件驱动通信机制的采用是希望减少无线传感器网络中的通信负担和能量消耗,只有在满足一定的触发条件时,每个传感器节点上的测量值才被传输到它的邻居节点.针对无线传感器网络,在一个统一框架下同时考虑数据丢包和事件触发的影响,建立滤波误差系统模型.利用李雅普诺夫稳定性理论,以LMIs形式给出基于事件触发的分布式H∞滤波性能判据和滤波器参数的设计方法.最后通过用数值仿真来验证所设计方案的有效性.